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BEGIN:VEVENT
SUMMARY:Breakup reactions of one-neutron halo nucleus 31Ne
DTSTART:20180604T043000Z
DTEND:20180604T044800Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11007@indico2.riken.jp
DESCRIPTION:Speakers: Takato Tomai (Tokyo Institute of Technology\, Depart
ment of physics)\n\nIt is well known that N=20 shell gap disappears in the
"island of inversion" and thus strong deformation appears.\nThe one-neutr
on halo nucleus 31Ne\, located in the island of inversion\, has attracted
much attention because it is the first example of a deformation-driven hal
o nucleus.\nRecent experimental studies on 31Ne revealed that it has low s
eparation energy Sn=0.15(+0.16)(-0.10)MeV\, and ground-state spin and pari
ty 3/2-.\nThese experimental results are consistent with a picture of defo
rmed halo structure.\nHowever the deformation has not measured directly ye
t.\n\nWe have performed an invariant-mass spectroscopy of 31Ne in the nucl
ear breakup reaction with a carbon target at ~230 MeV/u\, aiming at observ
ing its rotational band.\nAdditionally we also carried out a Coulomb break
up measurement with a lead target at ~230 MeV/u\, in order to investigate
its ground state properties.\nThese experiments have been done using SAMUR
AI spectrometer at RIBF\, RIKEN.\nThe experimental results will be discuss
ed in the presentation.\n\nhttps://indico2.riken.jp/event/2536/contributio
ns/11007/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11007/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of the unbound nuclei 27O and 28O using proton removal react
ions
DTSTART:20180607T011200Z
DTEND:20180607T013000Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11006@indico2.riken.jp
DESCRIPTION:Speakers: Yosuke KONDO (Tokyo Institute of Technology)\n\nThe
sudden change of the neutron dripline from 24O (N=16) to 31F (N=22)\, call
ed oxygen anomaly\, is one of the exotic phenomena. Recent theoretical stu
dies suggest importance of three nucleon forces on the binding energies of
the oxygen isotopes\, especially for N>16\, while available experimental
data are limited because the measurement requires production of extremely
neutron rich nuclei. \nThe region of the oxygen anomaly is also interestin
g in terms of the shell evolution. It is well known that the shell closure
of the N=20 nuclei disappears in the island of inversion. Recent in-beam
gamma-ray spectroscopy suggests that the N=20 shell gap is quenched at 29F
. The experimental study of 28O is strongly desired to clarify the shell e
volution along N=20 isotonic chain down to Z=8.\n\nThe SAMURAI21 collabora
tion studied 27O and 28O with SAMURAI spectrometer at RIKEN-RIBF. These un
bound nuclei are produced by two- and one-proton removal reaction on a liq
uid hydrogen target from 29Ne and 29F\, respectively. Decay products\, 24O
and neutrons\, are detected in coincidence to reconstruct the invariant m
ass of the 27O and 28O. The experimental results will be discussed in the
presentation.\n\nhttps://indico2.riken.jp/event/2536/contributions/11006/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11006/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Investigating excitation and nucleon correlation in 8He using reac
tions with a solid hydrogen target
DTSTART:20180604T065100Z
DTEND:20180604T070900Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11043@indico2.riken.jp
DESCRIPTION:Speakers: Matt Williams (TRIUMF / University of York)\, Greg H
ackman (TRIUMF)\, James Smallcombe (TRIUMF)\, Athanasios Psaltis (McMaster
University)\, James Measures (TRIUMF / University of Surrey)\, Matthias H
oll (Saint Mary's University / TRIUMF)\, Annika Lennarz (TRIUMF)\, Owen Pa
etkau (TRIUMF)\, Ritu Kanungo (Saint Mary's University / TRIUMF)\, Johnson
Liang (McMaster University)\, Martin Alcorta (TRIUMF)\, Barry Davids (TRI
UMF)\, Jaspreet Singh Randhawa (Saint Mary's University)\, Wolfgang Mittig
(NSCL / Michigan State University)\, Reiner Krücken (TRIUMF)\, Devin Con
nolly (TRIUMF)\, Jack Henderson (TRIUMF)\, Shigeru Ishimoto (KEK)\, Ali Ih
san Kilic (University of Guelph)\, Alejandra Diaz Varela (University of Gu
elph)\n\nThe nucleus 8He is the most neutron-rich nucleus known. Its struc
ture\, consisting of a 4He core surrounded by four neutrons makes it an id
eal case to study phenomena in highly neutron-proton asymmetric systems an
d neutron correlations at the nuclear surface. \nThe effects of the valenc
e neutrons were investigated experimentally using proton elastic and inela
stic scattering of 8He at the IRIS facility at ISAC-II at TRIUMF at 8.25 A
MeV. The two-neutron transfer from 8He was also measured to gain insight
into pairing of the valence neutrons.\nThe presentation will give an overv
iew of the IRIS reaction spectroscopy facility. It utilizes the novel soli
d H2 target in combination with a low-pressure ionization chamber to ident
ify the incoming beam particles\, and two Delta E-E telescopes to measure
the reaction products. \nResults of the data analysis will be presented fe
aturing excited states in 8He from inelastic scattering. The elastic scatt
ering cross section will be discussed in comparison to semi-microscopic op
tical potential calculations. A preliminary comparison of the cross sectio
ns for the population of the ground and first excited state in 6He from tw
o-neutron transfer will be discussed as well.\n\nhttps://indico2.riken.jp/
event/2536/contributions/11043/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11043/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Borromean Feshbach resonance in 11Li studied via 11Li(p\,p')
DTSTART:20180608T044800Z
DTEND:20180608T050600Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11018@indico2.riken.jp
DESCRIPTION:Speakers: Kazuyuki Ogata (RCNP\, Osaka University)\, Takuma Ma
tsumoto (Kyushu University)\, Junki Tanaka (TU Darmstadt)\n\nWe analyzed t
he 11Li(p\,p’) reaction at 6 MeV/nucleon by using a microscopic continuu
m-discretized coupled-channels method\, in which 11Li is described by a 9L
i + n + n three-body model. In this analysis\, we found a dipole resonance
of 11Li\, and the resonance can be interpreted as a bound state in the 10
Li + n system\, that is \, a Feshbach resonance in the 9Li + n + n system.
For 11Li\, the 10Li + n threshold is open above 9Li + n + n one\, which r
eflects a distinctive property of the Borromean system. Thus we refer to t
his resonance as a Borromean Feshbach resonance. The calculated cross sect
ions by taking into account the resonance and nonresonant continuum reprod
uce the experimental data recently observed. In this conference\, we will
show the results and discuss properties of the Borromean Feshbach resonan
ce.\n\nhttps://indico2.riken.jp/event/2536/contributions/11018/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11018/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Halo-induced large enhancement of soft dipole excitation of 11Li o
bserved via proton inelastic scattering
DTSTART:20180608T043000Z
DTEND:20180608T044800Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11046@indico2.riken.jp
DESCRIPTION:Speakers: Jaspreet singh Randhawa (Saint Mary's University / T
RIUMF)\, Alejandra Diaz Varela (University of Guelph)\, Shigeru Ishimoto (
KEK)\, Alisher Sanetulaev (Saint Mary's University)\, Christina Burbadge (
University of Guelph)\, Elizabeth Padilla Rodal (TRIUMF/UNAM)\, Orry Workm
an (Saint Mary's University)\, Julia Even (KVI-CART)\, Kyle G. Leach (TRIU
MF)\, Reiner Krücken (TRIUMF)\, Panu Ruotsalainen (TRIUMF)\, Kanungo Ritu
parna (Saint Mary's University / TRIUMF)\, Matthew Keefe (Saint Mary's Uni
versity)\, Nori Aoi (RCNP)\, Satbir Kaur (Saint Mary's University / Dalhou
sie University)\, Isao Tanihata (IRCNPC/RCNP)\, Jenna K Smith (TRIUMF)\, J
on Lighthall (TRIUMF)\, Barry Davids (TRIUMF)\, Junki Tanaka (TU Darmstadt
)\, Jack Henderson (TRIUMF)\, Martin Alcorta (TRIUMF)\, Steffen Cruz (TRIU
MF)\, Harris Bidaman (University of Guelph)\, Mushin N. Harakeh (KVI-CART)
\, Greg Hackman (TRIUMF)\n\nProton inelastic scattering off a neutron halo
nucleus\, 11Li\, has been studied in inverse kinematics at the IRIS facil
ity at TRIUMF. The aim was to establish a soft dipole resonance and to obt
ain its dipole strength. Using a high quality 66 MeV 11Li beam\, a strongl
y populated excited state in 11Li was observed at Ex=0.80 ± 0.02 MeV with
a width of Γ = 1.15 ± 0.06 MeV. A DWBA (distorted-wave Born approximati
on) analysis of the measured differential cross section with isoscalar mac
roscopic form factors leads us to conclude that this observed state is exc
ited in an electric dipole (E1) transition. Under the assumption of isosca
lar E1 transitions\, the strength is evaluated to be extremely large amoun
ting to 30∼296 Weisskopf units\, exhausting 2.2%∼21% of the isoscalar
E1 energy-weighted sum rule (EWSR) value. The large observed strength orig
inates from the halo and is consistent with the simple di-neutron model of
11Li halo.\n\nhttps://indico2.riken.jp/event/2536/contributions/11046/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11046/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of spectroscopic factors at N=29 using isobaric analog reson
ances in inverse kinematics
DTSTART:20180607T020000Z
DTEND:20180607T021800Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11027@indico2.riken.jp
DESCRIPTION:Speakers: Daniel Bazin (Michigan State University)\, Alain Gil
libert (CEA IRFU)\, Alex Brown (NSCL)\, Emmanuel Pollacco (CEA IRFU)\, Mic
helle Kuchera (Davidson University)\, Yassid Ayyad (LBNL)\, John Barney (N
SCL)\, Pierre Morfouace (GANIL)\, Jason Sammut (NSCL)\, Sean Sweany (NSCL)
\, Justin Estee (NSCL)\, William Lynch (NSCL)\, Juan Manfredi (NSCL)\, Joh
n Yurkon (NSCL)\, Wolfgang Mittig (NSCL)\, Joshua Bradt (NSCL)\, David Per
ez-Loureiro (NSCL)\, Nathan Watwood (NSCL)\, Lisa Carpenter (NSCL)\, Saul
Beceiro-Novo (NSCL)\, Marco Cortesi (NSCL)\, Ushasi Datta (Saha Institute)
\, Stefan Rost (NSCL)\n\nA measurement was recently performed at the Natio
nal Superconducting Cyclotron Laboratory on resonant proton scattering of
46Ar in inverse kinematics in the region of isobaric analog states of 47Ar
. The experiment was performed using a re-accelerated 46Ar radioactive bea
m at 4.6 MeV/u from the ReA3 linac after production via the projectile fra
gmentation of a 48Ca primary beam from the Coupled Cyclotron Facility. Thi
s beam was injected into the Active Target Time Projection Chamber where t
he reaction took place on an isobutane target and the scattered protons we
re detected. Four candidate resonances were observed\, two of which corres
ponding to the isobaric analogs of 47Ar ground and first excited states. S
pectroscopic factors were deduced from the strength of these resonances an
d compared to values in the literature. This novel experimental method to
extract spectroscopic information from proton elastic scattering on radioa
ctive nuclei will be presented\, as well as the analysis methods used to e
xtract results from the data.\n\nhttps://indico2.riken.jp/event/2536/contr
ibutions/11027/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11027/
END:VEVENT
BEGIN:VEVENT
SUMMARY:From ab initio structure predictions to reaction calculations via
effective field theory
DTSTART:20180605T055400Z
DTEND:20180605T061200Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11024@indico2.riken.jp
DESCRIPTION:Speakers: Daniel Phillips (Ohio University)\, Pierre Capel (Jo
hannes Gutenberg Universität Mainz)\, Hans-Werner Hammer (Technische Univ
ersität Darmstadt)\n\nHalo nuclei exhibit an uncommon nuclear structure w
ith a larger matter radius compared to stable nuclei [1]. This large size
is qualitatively understood as due to the loose binding of one or two vale
nce neutrons\, which have then a high probability of presence at a large d
istance from the other nucleons. They thus form a sort of halo around the
compact core of the nucleus. The best known examples are 11Be\, with a one
-neutron halo\, and 11Li\, with a two-neutron halo. Due to their short lif
etime\, these nuclei are mostly studied through reactions like breakup [2]
. In order to extract valuable structure information from measured cross s
ections\, a precise model of the reaction coupled to a reliable descriptio
n of the projectile is needed. Many such models have been developed (see R
ef. [3] for a recent review). However\, they mostly rely on a simple two-
or three-body description of the nucleus. Recently\, some of these exotic
nuclei have become accessible to ab initio calculations [4]. Unfortunately
\, such A-body descriptions are too computationally demanding to be direct
ly included within existing reaction models. In the present work\, we use
the outputs of an ab initio calculations of 11Be as inputs to the descript
ion\nof that nucleus within a reliable breakup model [5]. That description
is inspired by an effective field theory treatment of 11Be [6] (see Ref.
[7] for a recent review). Our calculations of the breakup of 11Be on Pb an
d C at about 70AMeV are in very good agreement with experimental measureme
nts [2]. These excellent results prove the feasibility of incorporating re
sults from ab initio calculations in reaction theory in this way. More imp
ortantly\, they confirm the results for important aspects of 11Be obtained
by the calculations of Calci et al. [4]\, hence improving our understandi
ng of the nuclear structure far from stability.\n\nReferences\n[1] I. Tani
hata J. Phys. G 22 157 (1996)\n[2] N. Fukuda et al. Phys. Rev. C 70 054606
(2004)\n[3] D. Baye and P. Capel Clusters in Nuclei\, Vol. 2 vol 848 ed B
eck C (2012\, Springer\, Heidelberg)\n[4] A. Calci\, P. Navratil\, R. Roth
\, J. Dohet-Eraly\, S. Quaglioni and G. Hupin Phys. Rev. Lett. 117 242501
(2016)\n[5] D. Baye\, P. Capel and G. Goldstein Phys. Rev. Lett. 95 082502
(2005)\n[6] C. Bertulani\, H.-W. Hammer and U. van Kolck Nucl. Phys. A 71
2 37-58 (2002)\n[7] H.-W. Hammer\, C. Ji and D. R. Phillips J. Phys. G 44
103002 (2017)\n\nhttps://indico2.riken.jp/event/2536/contributions/11024/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11024/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Constraints on the Symmetry Energy from Neutron-Removal Cross Sect
ions
DTSTART:20180605T011200Z
DTEND:20180605T013000Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11029@indico2.riken.jp
DESCRIPTION:Speakers: Carlos Bertulani (Department of Physics and Astronom
y\, Texas A&M University-Commerce\, USA\, Technische Universität Darmstad
t\, Germany)\, Stefan Typel (Technische Universität Darmstadt\, Germany\,
GSI Helmholtzzentrum für Schwerionenforschung\, Darmstadt\, Germany)\, T
homas Aumann (Technische Universität Darmstadt\, Germany\, GSI Helmholtzz
entrum für Schwerionenforschung\, Darmstadt\, Germany)\, Fabia Schindler
(Technische Universität Darmstadt\, Germany)\n\nAn experimentally constra
ined equation-of-state (EoS) of neutron-rich matter is one of the fundamen
tal goals in nuclear physics that has not been reached yet.The asymmetry t
erm of the EoS is usually expressed by the symmetry energy\, with its para
meters representing its value $J$ and slope $L$ at saturation density. To
date\, in particular the parameter $L$ is still poorly known. One method t
o bring insight into this open issue is to relate nuclear observables as t
heoretically predicted using well-calibrated energy-density functionals (E
DF) with the corresponding $L$-value. The challenge is to find observables
that are sensitive to $L$ and experimentally accessible. Two appropriate
candidates\, \\textit{i.e.}\, the neutron-skin thickness $\\Delta r_{np}$
and the ground-state dipole polarizabillity $\\alpha_D$ have been identifi
ed in recent years. The accurate experimental determination of these obser
vables\, however\, remains as a challenging task in particular for neutron
-rich nuclei.\n\nSeveral publications by Roca-Maza \\textit{et al.} demons
trate the feasibility of this method on the basis of a large set of EDF. T
he reachable constraint on $L$ naturally scales with the experimental unce
rtainty of the measured observable while the model-dependence\, \\textit{i
.e.}\, the scatter of theory points sets a hard limit that is in the order
of $\\pm 10\\\,$ MeV [1]. The latest analysis [2] limits the symmetry-ene
rgy slope parameter to 20-66 MeV by comparing available data for $\\alpha_
D$ with calculations in the random-phase approximation.\n\nFollowing the i
dea described above we have recently proposed a new method to constrain $L
$ that might allow to reach the theoretical limit\, namely\, the measureme
nt of neutron-removal cross sections $\\sigma_{\\Delta N}$ of neutron-rich
nuclei [3]. In our fist systematical study we show the sensitivity of $\\
sigma_{\\Delta N}$ to $\\Delta r_{np}$ and $L$ for the Sn isotopic chain u
sing a parameter-free eikonal reaction-theory and modified versions of the
DD2 interaction where $L$ is systematically varied. We conclude that $L$
can be potentially constrained down to $\\pm$ 10 MeV\, given that both the
measured and calculated cross-section are known to a 2\\\,\\% accuracy. \
nBeing aware that this seems to be an ambitious goal\, both aspects\, \\te
xtit{i.e.}\, the status and perspectives of the reaction theory as well as
the requirements of the experiments proposed to be performed at R$^{3}$B
will be discussed to show that this goal is definitely not out of reach.\n
\nReferences:\n\n[1] X. Roca-Maza\, M. Centelles\, X. Vi{\\~n}as\, and M.
Warda\, Phys. Rev. Lett. \\textbf{106}\, 252501 (2011)\n\n[2] X. Roca-Maza
\, X. {Vi{\\~n}as}\, M. Centelles\, B.K. Agrawal\, G. Col{\\`o}\, N. {Paa
r}\, J. {Piekarewicz}\, and D. Vretenar\, Phys. Rev. C \\textbf{92}\, 0643
04\, (2015)\n\n[3] T. Aumann\, C.A. Bertulani\, F. Schindler\, and S. Type
l\, Phys. Rev. Lett. \\textbf{119}\, 262501 (2017)\n\nhttps://indico2.rike
n.jp/event/2536/contributions/11029/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11029/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exploring the most neutron-rich isotopes of carbon and nitrogen
DTSTART:20180607T000000Z
DTEND:20180607T001800Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11031@indico2.riken.jp
DESCRIPTION:Speakers: Julien GIBELIN (LPC Caen\, ENSICAEN\, Université de
Caen\, CNRS/IN2P3\, Caen\, France)\, Q Deshayes (LPC-Caen)\, S Leblond (L
PC-Caen)\, Nigel Orr (LPC-Caen)\, Maruques G (LPC-Caen)\n\nExploring and u
nderstanding the structure of nuclei far from stability is one of the cent
ral themes of present day nuclear physics\, as evidenced by this workshop.
In this presentation\, work investigating the structure of the most neutr
on-rich isotopes of carbon and nitrogen employing high-energy nucleon remo
val (or “knockout”) will be discussed. These nuclei are of particular
interest as they encompass the N=14 and 16 sub-shell closures and lie belo
w doubly magic 22\,24O.\nFollowing a brief résumé of the motivation for
this work and the tools employed\, the results obtained for the unbound sy
stem 21C will be presented together with the prospects for probing the con
tinuum states of 22C\, including the search for the first 2+ state. The fi
rst observation of 24N will also be presented together with evidence for t
he existence of 25N as a resonance.\n\nhttps://indico2.riken.jp/event/2536
/contributions/11031/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11031/
END:VEVENT
BEGIN:VEVENT
SUMMARY:RI-beam-induced charge-exchange reaction studies combined with gam
ma-ray spectroscopy
DTSTART:20180605T005400Z
DTEND:20180605T011200Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11044@indico2.riken.jp
DESCRIPTION:Speakers: Shumpei Noji (NSCL/MSU)\n\nCharge-exchange reactions
at intermediate beam energies have been a powerful tool for studying spin
-isospin responses of nuclei. They become even more powerful when rare iso
tope beams are utilized or when combined with gamma-ray spectroscopy\, as
they gain new spin-isospin selectivities that are not possible with conven
tional reaction probes\, or allow for pinning down specific excitations wi
th precise energy determination. They are useful in particular for studyin
g giant resonances and a variety of other astrophysical phenomena such as
stellar electron captures. In this presentation\, I will discuss some of t
hese instances including our recent results on rare-isotope-beam-induced c
harge-exchange reactions including (12N\,12C)\, (10Be\,10B)\, and (t\,3He)
experiments performed at RIBF/RIKEN and NSCL/MSU.\n\nhttps://indico2.rike
n.jp/event/2536/contributions/11044/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11044/
END:VEVENT
BEGIN:VEVENT
SUMMARY:First Spectroscopy of 40Mg
DTSTART:20180604T044800Z
DTEND:20180604T050600Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11033@indico2.riken.jp
DESCRIPTION:Speakers: Paul Fallon (Lawrence Berkeley Laboratory)\, Heather
Crawford (Lawrence Berkeley National Laboratory)\n\nThe study of nuclei f
ar from stability is one of the most active and challenging areas of nucle
ar structure physics. One of the most exotic neutron-rich nuclei currently
accessible to experiment is 40Mg [1]\, which lies at the intersection of
the nucleon magic number N=28 and the dripline\, and is expected to have a
large prolate deformation similar to that observed in the neighboring lig
hter isotopes 32-38Mg [2]. In addition\, the occupation of the weakly boun
d p3/2 state may lead to the appearance of an extended neutron halo[3]. Th
us 40Mg offers an exciting possibility and a rare opportunity to investiga
te the coupling of weakly bound valence particles to a deformed core\, and
the influence of near threshold effects on collective rotational motion.\
n\nWe will discuss the results of an experiment carried out at RIBF RIKEN
to study low-lying states in 40Mg produced by a 1-proton removal reaction
from a ~240 MeV/u 41Al secondary beam. 40Mg and other final products were
separated and identified using the Zero Degree Spectrometer\, and prompt g
amma rays detected using the DALI2 array. The observed excitation spectru
m is shown to reveal unexpected properties as compared to both neighboring
(more bound) Mg isotopes and theoretical model predictions. \n\nThis work
is supported by the U.S. Department of Energy\, Office of Nuclear Physics
\, under contract no DE-AC02-05CH11231.\n\n[1] H. L. Crawford et al.\, Phy
s. Rev. C 89\, 041303(R) (2014).\n[2] P. Doornenbal et al.\, Phys. Rev. Le
tt. 111\, 212502 (2013).\n[3] F. Nowacki and A. Poves\, Phys. Rev. C 79\,
014310 (2009).\n\nhttps://indico2.riken.jp/event/2536/contributions/11033/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11033/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Elastic scattering of 6He from polarized proton at 200 A MeV
DTSTART:20180604T014500Z
DTEND:20180604T020300Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11047@indico2.riken.jp
DESCRIPTION:Speakers: Satoshi Sakaguchi (Dept. of Physics\, Kyushu Univers
ity)\n\nSpin-dependent interactions play essential roles in nuclear struct
ure and reactions. One of the best known examples is the spin asymmetry fo
und in nucleon elastic scattering\, which is a direct manifestation of th
e spin-orbit interaction. Since the spin-orbit interaction is expected to
work in the surface region\, it is natural to expect that such interaction
could be strongly modified by the characteristic surface structure of neu
tron-skin or -halo nuclei.\n At RIKEN RIBF\, we have measured the proto
n elastic scattering from 6He at 200 A MeV utilizing a spin-polarized prot
on target specially developed for the RI-beam experiments. Recoil protons
were detected with ESPRI Recoil Proton Spectrometer. Scattered particles w
ere analyzed by the SAMURAI spectrometer.\n The differential cross sect
ions have been obtained in the highest momentum transfer region among the
existing measurement\, where the cross sections are dominated by the contr
ibution of an alpha core. The data will be shown and compared with theoret
ical calculations assuming different radii of the core distribution. Preli
minary results of the vector analyzing power will also be presented.\n\nht
tps://indico2.riken.jp/event/2536/contributions/11047/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11047/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Transfer reactions induced with 56Ni: np pairing and N=28 shell cl
osure
DTSTART:20180604T063300Z
DTEND:20180604T065100Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11034@indico2.riken.jp
DESCRIPTION:Speakers: S. Franchoo (IPN)\, T. Roger (GANIL)\, B. Le Crom (I
PN)\, L. Achouri (LPC Caen)\, S. Leblond (LPC Caen)\, Y. Blumenfeld (IPN)\
, E. Pollacco (DRF/IRFU/DPhN//LENA)\, E. Clement (GANIL)\, J. Guillot (IPN
)\, N. Orr (LPC Caen)\, C. Kamalou (GANIL)\, P. Morfouace (GANIL)\, G. Ver
de (Laboratori Nazionali del Sud\, Instituto Nazionale di Fisica Nucleare\
, Catania\, Italy)\, F. Hammache (IPN)\, L. Perrot (IPN)\, J. Pancin (GANI
L)\, B. Bastin (GANIL)\, W. Catford (Department of Physics\, University of
Surrey\, United Kingdom)\, F. Flavigny (IPN)\, M. Assié (IPN)\, M. Marqu
es (LPC Caen)\, J.-A. Scarpaci (Centre de Sciences Nucléaires et Sciences
de la Matière\, Université Paris-Sud – CNRS/IN2P3\, 91406 Orsay\, Fra
nce)\, Q. Deshayes (LPC Caen)\, J. Gibelin (LPC Caen)\, M. Stanoiu (Horia
Hulubei National Institute of Physics and Nuclear Engineering\, Măgurele\
, Romania)\, G. Defrance (GANIL)\, N. De Séréville (IPN)\, F. Delaunay (
LPC Caen)\, Anastasia Georgiadou (Institut de Physique Nucléaire d'Orsay
(IPN))\, I. Stefan (IPN)\, O. Sorlin (GANIL)\, M. Vandebrouck (DRF/IRFU/DP
hN//LENA)\, A. Matta (LPC Caen)\, A. Gillibert (DRF/IRFU/DPhN//LENA)\, V.
Lapoux (DRF/IRFU/DPhN//LENA)\, J.-C. Thomas (GANIL)\, M. Fisichella (Labor
atori Nazionali del Sud\, Instituto Nazionale di Fisica Nucleare\, Catania
\, Italy)\, A. Corsi (DRF/IRFU/DPhN//LENA)\, J. Pereira (Universidade de S
antiago de Compostela\, E-15782 Santiago de Compostela\, Spain)\, D. Suzuk
i (IPN)\, B. Fernandez (Universidade de Santiago de Compostela\, E-15782 S
antiago de Compostela\, Spain)\, R. Borcea (Horia Hulubei National Institu
te of Physics and Nuclear Engineering\, Măgurele\, Romania)\, F. Rotaru (
Horia Hulubei National Institute of Physics and Nuclear Engineering\, Măg
urele\, Romania)\, M.-C. Delattre (IPN)\n\nAn efficient way to explore the
nuclear structure is the effective use of transfer reactions. Two differe
nt physical aspects are being investigated with the use of transfer reacti
ons on 56Ni\, which is a N=Z unstable doubly magic nucleus. \n\n(i)To prob
e the gap of N=28\, we study the spectroscopy of the N=29 and N=27 isoton
es by the (d\,t)\, (p\,d) and (d\,p) one nucleon transfer reactions on 56N
i (N=28 isotone) and extract information on the single-particle configurat
ion around the Fermi surface. \n\n(ii)To study the np pairing in the self-
conjugate nucleus 56Ni\, we have measured the two-nucleon transfer reactio
ns 56Ni(p\, 3He)54Co [1] and 56Ni(d\,α)54Co. In the (p\,3He) reaction\, t
he ratio of the population of the T=0 and T=1 states indicates a predomina
nce of T=1 pairing [1]. The selectivity of the (d\,α) reaction enables th
e investigation of the T=0 channel with better precision.\n\nDuring spring
2014 the experiment aiming to these studies took place at GANIL-Caen\, Fr
ance. The radioactive beam of 56Ni at 30MeV/u was produced by fragmentatio
n of 58Ni and purification. Measurements were performed in inverse kinemat
ics on CH2 and CD2 targets. The experiment included a 4π coverage for the
study of the charged projectiles with the MUST2 and TIARA detectors\, whi
le 4 clovers of EXOGAM were also used for γ-particle coincidences in orde
r to identify the populated state of the residue. The analysis of the 56Ni
(d\,t)55Ni and 56Ni(d\,p)57Ni reactions yield the differential cross-secti
on for transfer reaction to the ground state and the excited states of 55N
i and 57Ni giving information about the shell closure and depicting the Fe
rmi surface of 56Ni. I will present the angular distribution and compare
with the results for the (p\,dγ)\, (d\,tγ) and (d\,pγ) reactions\, as w
ell as with DWBA calculations. The results for the transfer reaction 56Ni(
d\,α)54Co will be also presented\, completing the information about the s
trength of the isoscalar np pairing in the closure of the fp shell.\n\n\n\
n\n[1]Benjamin Le Crom\, Thesis: “Etude de l’appariement neutron-proto
n dans les noyaux instables N=Z par réactions de transfert.” Physique N
ucléaire Expérimentale [nucl-ex]. Université Paris-Saclay\, 2016.\n\nht
tps://indico2.riken.jp/event/2536/contributions/11034/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11034/
END:VEVENT
BEGIN:VEVENT
SUMMARY:X-ray bursts: Indirect measurement of the astrophysical 23Al(p\,γ
) reaction
DTSTART:20180605T073600Z
DTEND:20180605T075400Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11037@indico2.riken.jp
DESCRIPTION:Speakers: Mustafa Rajabali (Tennesee Tech)\, Yukiya Saito (TRI
UMF/UBC)\, Michael Bowry (TRIUMF)\, Daniel Levy (TRIUMF)\, Anita Mathews (
Waterloo/TRIUMF)\, Michael Spencer (Surrey/TRIUMF)\, Benjamin Luna (Tennes
se Tech)\, Leyla Attar (Guelph)\, Eva Kasanda (Guelph)\, Soumendu Sekhar B
hattacharjee (TRIUMF)\, Ali Ihsan Kilic (Guelph)\, Roger Caballero-Folch (
TRIUMF)\, Farnaz Ghazi Moradi (Guelph)\, Donald Chaeny (Tennesse Tech)\, A
dam Garnsworthy (TRIUMF)\, Wilton Catford (University of Surrey)\, James S
mallcombe (TRIUMF)\, Matthew Williams (TRIUMF/University of York)\, Stephe
n Gillespie (TRIUMF)\, Hiral Patel (Waterloo/TRIUMF)\, Beau Greaves (Guelp
h)\, Greg Hackman (TRIUMF)\, Jack Henderson (TRIUMF)\, Tom Drake (Toronto)
\, Jonah Berean (TRIUMF/UBC)\, Mohamad Moukaddam (University of Surrey)\,
Gavin Lotay (University of Surrey)\, Kenneth Whitmore (TRIUMF/SFU)\, Bruno
Olaizola (TRIUMF)\, Devin Hymers (Guelph)\, Nigel Orr (LPCCaen)\, Nikita
Bernier (TRIUMF)\, Samuel Hallam (University of Surrey)\, Fuad Ali (Guelph
\, Canada / Sulaimani\, Kurdistan\, Iraq)\, Calum Jones (University of Sur
rey/TRIUMF)\, Dennis Muecher (Guelph)\n\nX-ray bursts are the most frequen
t stellar explosions to occur throughout the cosmos and as such\, represen
t key research environments for the field of nuclear astrophysics. These c
ataclysmic binary systems are known to exhibit distinctive light curves\,
which have now been observed with unprecedented sensitivity\, that provide
a detailed reflection of the underlying nuclear physics processes involve
d. Consequently\, an accurate understanding of the observed light curves m
ay hold the key to the unraveling of the burst mechanism\, as well as the
companion neutron star properties.\n\nRecently\, an in-depth study of the
dependence of X-ray burst models on nuclear reaction rates has highlighted
the 23Al(p\,γ)24Si as being of particular significance in determining th
e shape of the X-ray burst light curve [1]. A direct investigation of this
reaction is presently unfeasible due to the current low intensities of ra
dioactive 23Al beams. As such\, an innovative indirect approach is require
d.\n\nIn this talk\, I will present the first ever study of the 23Ne(d\,p)
24Ne transfer reaction\, which was recently performed at the ISAC-II facil
ity at TRIUMF using a radioactive beam of 23Ne. Here\, the high-granularit
y TIGRESS γ-ray array was used in conjunction with the SHARC silicon dete
ction system to extract spectroscopic information on excited states in 24N
e. These states represent key isobaric analogs of resonances in 24Si and t
herefore\, by measuring their spectroscopic strengths and employing mirror
symmetry\, it is possible to indirectly determine the 23Al(p\,γ) stellar
reaction rate. Such investigations have been extremely successful in rece
nt years in constraining astrophysical reactions that lie outside the reac
h of direct measurements [2\,3].\n\n[1] R.H. Cyburt et al.\, Astrophys. J.
830\, 55 (2016).\n[2] V. Margerin\, G. Lotay et al.\, Phys. Rev. Lett. 11
5\, 062701 (2015).\n[3] S.D. Pain et al.\, Phys. Rev. Lett. 114\, 212501 (
2015).\n\nhttps://indico2.riken.jp/event/2536/contributions/11037/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11037/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Persistence of nuclear shell closures far from stability: in-beam
γ spectroscopy of 79Cu after proton knockout
DTSTART:20180608T022100Z
DTEND:20180608T023900Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11035@indico2.riken.jp
DESCRIPTION:Speakers: Alexandre Obertelli (TU Darmstadt)\, Megumi Niikura
(University of Tokyo)\, Serge Franchoo (IPN Orsay)\, Yusuke Tsunoda (Unive
rsity of Tokyo)\, Louis Olivier (IPN Orsay)\, Pieter Doornenbal (RIKEN)\,
Freddy Flavigny (IPN Orsay)\, Takaharu Otsuka (University of Tokyo)\n\nThe
shell model remains one of the main building blocks of nuclear structure.
Its robustness is well proven for nuclei close to stability\, where it su
ccessfully explains the occurence of magic numbers. However\, these magic
numbers are not universal throughout the nuclear chart and their evolution
away from stability\, observed experimentally over the last decades\, has
generated much interest. To probe the possible erosion of the Z=28 shell
gap in 78Ni\, in-beam γ-ray spectroscopy of 79Cu was performed at the Rad
ioactive Isotope Beam Factory of Riken in Japan. The incoming isotopes wer
e identified in the Bigrips spectrometer. The knockout reaction from the s
elected 80Zn beam at 270 MeV/n took place in the Minos liquid-hydrogen tar
get\, surrounded by a TPC for proton tracking. The outgoing nuclei were id
entified in the Zerodegree spectrometer. The Dali2 scintillator array was
installed around Minos for gamma-ray detection. We built the first level s
cheme of 79Cu up to 4.6 MeV of excitation energy\, at the limit of gamma-r
ay spectroscopy. The results were compared to Monte-Carlo shell-model calc
ulations and show that the 79Cu nucleus can be described in terms of a val
ence proton outside a 78Ni core\, providing indirect evidence of the magic
character of the latter. Cross sections were extracted and compared to re
cent DWIA calculations\, from which we find more fragmentation of the sing
le-particle strengths than expected.\nNew data was also obtained on the 83
Ga and 85Ga isotopes beyond N=50\, which is presently under analysis and i
ncludes a fresh level scheme for 83Ga.\n\nhttps://indico2.riken.jp/event/2
536/contributions/11035/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11035/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Production of neutron-rich nuclei via two-proton knockout reaction
with deuterium target
DTSTART:20180607T021800Z
DTEND:20180607T023600Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11039@indico2.riken.jp
DESCRIPTION:Speakers: Midori Miwa (Department of Physics\, Toho University
)\, Alexandre Obertelli (TU Darmstadt)\, Pieter Doornenbal (RIKEN)\, He Wa
ng (RIKEN Nishina Center)\, Tomohiro Uesaka (RIKEN Nishina Center)\, Hidea
ki Otsu (RIKEN Nishina Center)\, Yuki Kubota (RIKEN Nishina Center)\n\nPro
duction of neutron-rich nuclei through one-nucleon knockout (p\,2p) reacti
ons has been successfully demonstrated with the MINOS at RIBF. In future R
IBF experiments\, a method to remove more than one protons with a reasonab
le rate will be required for production of more neutron-rich nuclei. At pr
esent there is no consensus on what is the best reaction for two-proton re
moval. In this presentation\, a performance of the (d\, 3pn) reaction with
the MINOS as a candidate of the two-proton knockout driver in future RIBF
experiments is discussed. The experiment was carried out using the SAMURA
I spectrometer. A secondary cocktail beam including 58Ti was produced with
projectile fragmentation reactions of a primary 70Zn beam at 345 MeV/u im
pinging on a beryllium target. The liquid hydrogen and deuterium with thic
knesses of 1.1 g/cm2 and 2.6 g/cm2\, respectively\, were used as the secon
dary targets. The cross sections were derived by counting the numbers of p
articles before and after the target\, considering an effective beam inten
sity. The secondary beam and fragments were identified event by event usin
g the ∆E–TOF–Bρ method. It was found that cross section for two-pro
ton removal with a deuteron target is larger by a factor of ~3 than that w
ith a proton target. This fact may imply possible advantages of a deuteron
target to produce neutron-rich nuclei via two-proton knockout.\n\nhttps:/
/indico2.riken.jp/event/2536/contributions/11039/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11039/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exotic light nuclei from ab initio theory
DTSTART:20180608T000000Z
DTEND:20180608T001800Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11045@indico2.riken.jp
DESCRIPTION:Speakers: Matteo Vorabbi (TRIUMF)\, Guillaume Hupin (IN2P3/CNR
S Orsay)\, Sofia Quaglioni (LLNL)\, Petr Navratil (TRIUMF)\n\nOne of the r
ecently developed approaches capable of describing both bound and scatteri
ng states in light nuclei simultaneously is the No-Core Shell Model with C
ontinuum (NCSMC). I will present recent NCSMC calculations of weakly bound
states and resonances of exotic halo nuclei 6He and 11Be. I will also dis
cuss the 11Be mirror 11N\, an unbound 10C+p system\, and highlight the rol
e of chiral NN and 3N interactions in the description of the 10C(p\,p) sca
ttering measured recently at TRIUMF. Finally\, I will discuss our new calc
ulations of the structure of the unbound 9He nucleus as well as our ongoin
g calculations of the 11C(p\,p) scattering and 11C(p\,gamma)12N capture.\n
\nhttps://indico2.riken.jp/event/2536/contributions/11045/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11045/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Analysis of isospin dependence of "quenching factors" for (p\,pn)
and (p\,2p) reactions via the Transfer to the Continuum formalism
DTSTART:20180608T014500Z
DTEND:20180608T020300Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11042@indico2.riken.jp
DESCRIPTION:Speakers: Antonio M. Moro (Universidad de Sevilla)\, Mario Gó
mez Ramos (Universidad de Sevilla)\n\nNucleon removal (p\,pn) and (p\,2p)
reactions at intermediate energies have gained renewed attention in recent
years as a tool to extract information from exotic nuclei\, thanks to the
availability of exotic beams with which to perform these reactions in inv
erse kinematics. The information obtained from these experiments is comple
mentary to that obtained from nucleon removal experiments with heavier tar
gets (knockout)\, but is expected to be sensitive to deeper portions of th
e wave function of the removed nucleon.\n\nRecently\, two sets of (p\,pn)
and (p\,2p) data on oxygen and nitrogen isotopes have been obtained by the
R3B collaboration [1\,2] and have been analysed in terms of the eikonal D
WIA [1] and Faddeev/AGS [2] formalisms. Both analyses obtain a reduction i
n the spectroscopic strength but predict a different magnitude for this re
duction and different isospin dependence. Also\, it must be noted that the
analysis of [1] was restricted to five selected oxygen isotopes\, which w
ere deemed to be more suitably described by the Independent Particle Model
(IPM).\n\nIn this contribution we present a joint analysis of both sets o
f data\, including all measured isotopes\, using a common reaction framewo
rk\, the recently developed Transfer to the Continuum [3] formalism\, with
consistent potentials and structure inputs. Our analysis shows an almost
constant reduction factor with a very small\, nearly absent\, isospin depe
ndence. This result is in accord with recent transfer experiments [4]\, bu
t at odds with the marked asymmetry obtained from the systematic analysis
of nucleon knockout reactions at intermediate energies [5]. The effect of
the distorting potentials on these results is explored by using two differ
ent sets of potentials. It is found that the small asymmetry is maintained
with both sets even if the reduction factors for the specific reactions m
ay be significantly different.\n\n[1] L. Atar et al\, Phys. Rev. Lett. 120
\, 052501 (2018) \n[2] P. Díaz-Fernández et al\, To be published in Phys
. Rev. C \n[3] A.M. Moro\, Phys. Rev. C 92\, 044605 (2015) \n[4] F. Flavig
ny et al\, Phys. Rev. Lett. 110\, 122503 (2013)\n[5] J. A. Tostevin and A.
Gade\, Phys. Rev. C 90\, 057602 (2014)\n\nhttps://indico2.riken.jp/event/
2536/contributions/11042/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11042/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Studying clustering in O-14 and Be-7 nuclei using resonant scatter
ing and Coulomb excitation
DTSTART:20180607T055400Z
DTEND:20180607T061200Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11049@indico2.riken.jp
DESCRIPTION:Speakers: Wanpeng Tan (University of Notre Dame)\, Joshua Brad
t (NSCL\, Michigan State University)\, Tan Ahn (University of Notre Dame)\
, Lisa Carpenter (NSCL\, Michigan State University)\, Yassid Ayyad (Lawren
ce Berkeley National Lab)\, Jacob Long (University of Notre Dame)\, Dan Ba
rdayan (University of Notre Dame)\, Wolfgang Mittig (NSCL\, Michigan State
University)\, Saul Beceiro (NSCL\, Michigan State University)\, Maxime Br
odeur (University of Notre Dame)\, Matthew Hall (University of Notre Dame)
\, Daniel Bazin (Michigan State University)\, Sebastian Aguilar (Universit
y of Notre Dame)\, Anna Simon (University of Note Dame)\, Samuel Henderson
(University of Notre Dame)\n\nClustering in light nuclei is a prominent f
eature that manifests itself through various physical observables\, which
serve as a guide and constraint for nuclear theory. More precise data on t
hese observables\, especially for unstable nuclei\, are needed to better c
onstrain nuclear theory and thus give us a more fundamental understanding
of what causes nuclei to cluster. In order to obtain more data on cluster
states in light nuclei\, we performed an experiment using resonant alpha s
cattering with a C-10 radioactive beam to search for cluster states in the
proton-rich nucleus O-14 where the structure and properties of levels abo
ve the alpha threshold are not well known. Scattering cross sections for t
he C-10 + alpha resonant scattering were measured with the Prototype Activ
e-Target Time-Projection Chamber. Preliminary results for the analysis of
this experiment will be presented. A second experiment using Coulomb excit
ation with a radioactive beam of Be-7 will be presented. The electromagnet
ic transition strength to the first excited state was measured and the cur
rent results will be compared to various ab-initio nuclear model predictio
ns. These predictions show that clustering and thus the inclusion of conti
nuum states is important for reproducing several electromagnetic observabl
es.\n\nhttps://indico2.riken.jp/event/2536/contributions/11049/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11049/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of neutron-neutron correlation in Borromean nucleus 11Li via
the quasi-free (p\,pn) reaction
DTSTART:20180608T052400Z
DTEND:20180608T054200Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11050@indico2.riken.jp
DESCRIPTION:Speakers: Yuki Kubota (RIKEN Nishina Center)\n\nDineutron corr
elation is one of the phenomena expected to appear in neutron drip-line nu
clei. It has been studied using different approaches\, such as the transfe
r reaction and the break up reaction. However\, currently available data s
eem to be insufficient to study the neutron-neutron correlation in terms o
f (i) the decomposition of high-angular-momentum components\, (ii) the ext
raction of a core excitation\, (iii) and the effect of final state interac
tions (FSIs)[1]. In the present study\, (i) the MINOS[2] was used for high
er luminosity\, (ii) γ rays were detected to tag the core excitation\, (i
ii) and the quasi-free (p\,pn) reaction was employed to minimize the FSI.
In order to determine the neutron momentum distribution\, the kinematicall
y complete measurement was performed. The opening angle between the two ne
utrons was reconstructed from the measured momentum vectors of all the par
ticles involved in the reaction. \nThe experiment was carried out by using
the SAMURAI spectrometer[3] combined with the liquid hydrogen target syst
em MINOS. Momentum vectors of a knocked-out neutron and a recoil proton we
re respectively determined by the neutron detector WINDS and a recoil prot
on detector setup\, developed for this project. Decay neutrons and heavy f
ragments were momentum analyzed by the neutron detector NEBULA and the SAM
URAI spectrometer\, respectively.\nThe results on 11Li will be presented i
n this talk.\n\nReferences \n[1] Y. Kikuchi et al.\, Phys. Rev. C 87\, 0
34606 (2013). \n[2] A. Obertelli et al.\, Eur. Phys. Jour. A 50\, 8 (201
4). \n[3] T. Kobayashi et al.\, Nucl. Instr. Meth. B 317\, 294(2013).\n\
nhttps://indico2.riken.jp/event/2536/contributions/11050/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11050/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Probing three-nucleon-force effects via knockout reactions
DTSTART:20180608T001800Z
DTEND:20180608T003600Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11051@indico2.riken.jp
DESCRIPTION:Speakers: Kosho Minomo (Research Center for Nuclear Physics\,
Osaka University)\, Kazuyuki Ogata (RCNP\, Osaka University)\, Michio Kohn
o (Research Center for Nuclear Physics\, Osaka University)\, Kazuki Yoshid
a (research center for nuclear physics)\n\nUnderstanding of the roles of t
hree-nucleon forces (3NFs) in nuclear few- and many-body systems is one of
the fundamental subjects in nuclear physics. Recently\, 3NFs are construc
ted with chiral effective field theory in which two-\, three-\, and many-n
ucleon forces are treated consistently and systematically. The chiral 3NF
effects have been analyzed in few-body systems and nuclear matter\, and th
e binding energies of light nuclei and the saturation property in symmetri
c nuclear matter were well reproduced. Furthermore\, it was found that the
chiral 3NF effects improve the agreement between theoretical and measured
cross sections for nucleus-nucleus elastic scattering.\n In this talk\, w
e propose to use proton knockout reactions (p\,2p) at intermediats and hig
h energies\, which can be regarded as a two-proton quasielastic scattering
\, as a new probe into chiral 3NF effects on reaction observables. In a ma
ny-body system\, 3NF effects can be represented by the density-dependence
of nucleon-nucleon effective interaction. Proton knockout reactions from a
deeply bound orbit should be suitable for probing 3NF effects since such
reactions occur mainly in the internal region of the target nucleus in whi
ch the density is high. We clarify the roles of chiral 3NF for knockout re
actions based on the distorted-wave impulse approximation with a nucleon-n
ucleon g-matrix interaction including the 3NF effects. The chiral 3NF effe
cts significantly change the peak height of the triple differential cross
section of (p\,2p) reactions.\n\nhttps://indico2.riken.jp/event/2536/contr
ibutions/11051/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11051/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shell structure of 43S studied by one-neutron knockout reaction
DTSTART:20180604T050600Z
DTEND:20180604T052400Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11054@indico2.riken.jp
DESCRIPTION:Speakers: Kathrin Wimmer (The University of Tokyo)\, Daniel Ba
zin (Michigan State University)\, Kirby W Kemper (Florida State Universy)\
, Eric Lunderberg (NSCL)\, Peter Bender (NSCL)\, Satoru Momiyama (Departme
nt of Physics\, University of Tokyo)\, Noritaka Kitamura (Center for Nucle
ar Study\, University of Tokyo)\, Philipp Schrock (CNS\, University of Tok
yo)\, Alexandra Gade (NSCL)\, Shinsuke Ota (Center for Nuclear Study\, Uni
versity of Tokyo)\, Brandon Elman (NSCL)\, Megumi NIIKURA (Department of P
hysics\, the University of Tokyo)\, Joe Belarge (NSCL)\, Dirk W Weisshaar
(NSCL/MSU)\n\nSouth of 48Ca in the nuclear chart\, the erosion of the neut
ron magic number 28 and the onset of collective behavior have been observe
d.\nEspecially the ground-state deformation\, the shape coexistence\, and
the high-K isomerism in 44S have been discussed both experimentally and th
eoretically. \nIn this region these phenomena related to the deformation o
f the nucleus are thought to originate from the interplay of quenching the
N = 28 shell gap and quadrupole excitations across Z = 14\, 16 sub-shell
and N = 28 shell gaps. \nThe proton configuration of the 44S ground state
was investigated previously but the neutron occupation remains unknown pri
or to this study. \nTo clarify the reduction of the N = 28 shell gap and t
he role of the neutron configuration to the deformation in 44S\, an in-bea
m gamma-ray spectroscopic study focused on the one-neutron knockout reacti
on from 44S was performed. \nOne-neutron knockout reaction can selectively
produce neutron-hole states and is sensitive to the neutron occupation of
the ground state of the projectile nucleus. \nAlso the parallel momentum
distribution of the reaction residue is related to the orbital angular mom
entum of the knocked out neutron\, which is helpful to assign the spin-par
ity to each final state of reaction residue. \n\nThe experiment was perfor
med at the NSCL. \nA 100-MeV/u secondary beam of 44S was produced by fragm
entation of a 48Ca primary beam on a Be production target.\nThe secondary
beam impinged on a secondary beryllium target inducing the one-neutron kno
ckout-reaction.\nPrompt gamma-rays from excited states in 43S emitted at t
he target were detected by the GRETINA tracking array.\nThe one-neutron kn
ockout residues were identified in the S800 spectrograph which also measur
es the momenta and angles of ejectiles.\nIn order to deduce the level sche
me above the isomeric state at 320 keV in 43S and population to this state
for the deduction of the neutron configuration in the fp shell\, the IsoT
agger which consists of 32 CsI scintillators was placed downstream at the
end of the beam line. \n\nThe level scheme of 43S deduced via the in-beam
gamma-ray spectroscopy of this experiment will be presented combining the
analysis on momentum distributions produced by the one-neutron knockout r
eaction. There also will be the comparison with shell model calculations.\
n\nhttps://indico2.riken.jp/event/2536/contributions/11054/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11054/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of spin-isospin responses of light nuclei near and along the
drip line with PANDORA
DTSTART:20180607T001800Z
DTEND:20180607T003600Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11057@indico2.riken.jp
DESCRIPTION:Speakers: Zaihong Yang (RIKEN)\, Hidetada Baba (RIKEN)\, Yuki
Kubota (RIKEN Nishina Center)\, Juzo ZENIHIRO (RIKEN Nishina Center)\, Ken
taro Yako (CNS\, University of Tokyo)\, Masaki Sasano (RIKEN Nishina Cente
r)\, Eiichi Takada (NIRS)\, Tomohiro Uesaka (RIKEN Nishina Center)\, Valer
ii Panin (RIKEN\, Spin-isospin laboratory)\, JIAN GAO (RIKEN)\, Laszlo Stu
hl (Center for Nuclear Study\, University of Tokyo)\, Zeren Korkulu (ATOMK
I)\n\nThe charge-exchange (p\,n) reactions at intermediate beam energies a
nd small angles\, can selectively excite Gamow-Teller (GT) states up to hi
gh excitation energies in the final nucleus. Therefore\, (p\,n) reactions
in inverse kinematics applying the missing mass reconstruction[1\,2] provi
de the best and efficient tool to study the B(GT) strengths values of unst
able isotopes in a wide excitation energy region\, without Q-value limitat
ion.\nAn experimental program aiming to study the spin-isospin responses o
f light nuclei along the drip line was started at RIKEN RIBF. A measuremen
t [3]\, SAMURAI-30\, with 5 days of beam time was approved to investigate
8He\, 11Li and 14Be nuclei. In a pilot measurement of the mentioned experi
ment at HIMAC facility in Chiba\, we studied the Gamow-Teller transitions
of 6He in inverse kinematical (p\,n) reactions at 123 MeV/nucleon incident
energy using polyethylene target. Our new neutron detector\, PANDORA [4]\
, with digital readout was also commissioned.\nIn this talk\, details of e
xperiment and the results of B(GT) strengths distribution of 6He will be r
eported as well as a brief overview of the whole program will be presented
.\n\n[1] M. Sasano et al.\, Phys. Rev. Lett. 107\, 202501 (2011).\n[2] M.
Sasano et al.\, Phys. Rev. C 86\, 034324 (2012).\n[3] L. Stuhl et al.\, RI
KEN Accelerator Progress Report 48\, 54 (2015). \n[4] L. Stuhl et al.\, Nu
cl. Instr. Meth. A 866\, 164 (2017).\n\nhttps://indico2.riken.jp/event/253
6/contributions/11057/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11057/
END:VEVENT
BEGIN:VEVENT
SUMMARY:E1 responses of neutron-rich Ca isotopes 50Ca and 52Ca
DTSTART:20180607T073600Z
DTEND:20180607T075400Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11052@indico2.riken.jp
DESCRIPTION:Speakers: Yasuhiro Togano (Tokyo Institute of Technology)\n\nT
he density dependence of the symmetry energy is one of the keys for unders
tanding the bulk properties of neutron-rich nuclei and astrophysical event
s\, such as supernovae and neutron stars. \n\nRecent theoretical works sho
w that the E1 response of nuclei is well correlated to the density depende
nce of the symmetry energy close to the saturation density. The dipole pol
arizability\, the inversely energy weighted sum of E1 strength\, is pointe
d out as less model-dependent observable to constrain the density dependen
ce of the symmetry energy. In addition\, it is indicated that the low-ener
gy E1 strength up to 10 MeV in 52Ca is well correlated to the density depe
ndence of the symmetry energy. To constrain the symmetry energy with these
correlations\, the E1 response of 50Ca and 52Ca have been measured by usi
ng the relativistic Coulomb excitation.\n\nThe experiment was performed us
ing the SAMURAI spectrometer at RIKEN RIBF. The 50Ca and 52Ca beams were i
mpinged on Pb and C targets. The outgoing charged particles and neutrons w
ere measured by SAMURAI spectrometer and the neutron detectors NEBULA and
the NeuLAND demonstrator\, respectively. The de-excitation gamma-ray from
the reaction residue was measured by the gamma-ray detector CATANA.\n\nIn
this talk\, we will report the results obtained for the bound excited stat
es and one-neutron decay channel of 52Ca.\n\nhttps://indico2.riken.jp/even
t/2536/contributions/11052/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11052/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Inclusive Quasifree Scattering Cross Sections from Medium-Mass Neu
tron-Rich Nuclei
DTSTART:20180608T020300Z
DTEND:20180608T022100Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11058@indico2.riken.jp
DESCRIPTION:Speakers: Carlos Carlos Bertulani (Texas A&\;M University-C
ommerce)\, Jose-Luis Rodriguez Sanchez (GSI\, CEA)\, Clementine Santamaria
(NSCL\, MSU)\, Alexandre Obertelli (TU Darmstadt)\, Pieter Doornenbal (RI
KEN)\, Nancy Paul (CEA Saclay)\n\nDirect nucleon removal has become a tool
of choice to study structure and reactions in exotic nuclei [1\,2\,3]. De
spite the pervasiveness of this method\, theoretical approaches to describ
e these reactions remain incomplete. To remedy this\, part of the communit
y has focused on experiments with pure proton targets at intermediate ener
gies where the quasifree scattering paradigm may be invoked and the reacti
on mechanism simplified [3\,4]. However\, to date\, little data exists for
exotic nuclei. \nAt the Radioactive Isotope Beam Factory\, we have measur
ed 77 single proton and neutron removal inclusive cross sections from neut
ron-rich exotic nuclei from Cr (Z=24) to Tc (Z=43). Obtained on a 10 cm th
ick liquid hydrogen target [5] at ~250 MeV/U\, consistent with quasifree s
cattering\, these results provide a systematic exploration of direct react
ion cross sections with isospin and across the N=50 shell closure. The evo
lution of the cross sections with mass and separation energy will be prese
nted\, and the results compared to state-of-the-art Intranuclear Cascade M
odel and Distorted Wave Eikonal calculations. \n\n[1] T. Wakasa\, K. Ogata
\, T. Noro\, Proton-induced knockout reactions with polarized and unpolari
zed beams\, Progress in Particle and Nuclear Physics 96\, 32 (2017).\n[2]
V. Panin et al\, Exclusive measurements of quasi-free proton scattering re
actions in inverse and complete kinematics\, Physics Letters B 753\, 204 (
2016). \n[3] T. Aumann\, C. A. Bertulani\, J. Ryckebusch\, Quas
ifree (p\,2p) and (p\,pn) reactions with unstable nuclei\, Phys. Rev. C 88
\, 06461010 (2013). \n[4] A. Obertelli and T. Uesaka\, Hydrogen targets fo
r exotic-nuclei studies developed over the past 10 years. Eur. Phys. J. A
47: 105 (2011). \n[5] A. Obertelli et al\, MINOS: A vertex tracker couple
d to a thick liquid-hydrogen target for in-beam spectroscopy of exotic nuc
lei. Eur. Phys. J. A 50: 8 (2014).\n\nhttps://indico2.riken.jp/event/2536/
contributions/11058/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11058/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Structure of 9C via proton elastic scattering
DTSTART:20180607T051800Z
DTEND:20180607T053600Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11059@indico2.riken.jp
DESCRIPTION:Speakers: Ethan Uberseder (Texas A&M University - Cyclotron Un
iversity)\, Antti Saastamoinen (Texas A&M University - Cyclotron Institute
)\, Grigory Rogachev (Texas A&M University - Cyclotron Institute)\, Sritej
a Upadhyayula (Cyclotron Institute - Texas A&\;M University)\, Sunghoon
Ahn (Texas A&M University - Cyclotron Institute)\, Joshua Hooker (Texas A
&\;M University - Cyclotron Institute)\, Dangallage Heshani Jayatissa (
Texas A&\;amp\;M University)\, Evgeniy Koshchiy (Texas A&M University -
Cyclotron)\, Curtis Hunt Hunt (Texas A&\;M University - Physics and As
tronomy)\, Emanuel Pollacco (CEA/DSM/DAPNIA/SPhN\, Saclay)\, Brian Roeder
(Texas A&M University - Cyclotron Institute)\n\nThe structure of $^9$C was
studied using $^8$B+p resonance scattering with the newly commissioned Te
xas Active Target (TexAT) detector system. Recent theoretical developments
allow for robust predictions of level structure of light nuclei\, includi
ng continuum effects\, starting from nucleon-nucleon and three-nucleon int
eractions [1\, 2\, 3]. High quality experimental data are necessary to ben
chmark these predictions. Experimental data on $^9$C is limited - only two
excited states in $^9$C have been observed. The goal of this work was two
-fold. First\, the $^8$B+p resonance scattering was used as the first comm
issioning experiment for the active target detector system TexAT. This rea
ction was chosen because the experimental data on $^8$B+p elastic scatteri
ng excitation function at low energy are available [4]. The second goal wa
s to search for positive parity states in $^9$C (non are known). For that
we extended the $^8$B+p elastic scattering excitation function to higher e
xcitation energy\, improved statistics and quality of the existing low ene
rgy data\, measured angular distribution\, and also searched for the $^8$B
(p\,2p) reaction channel. Preliminary results of this run will be discusse
d. [1] N. Mihel\, W. Nazarewiz\, M. Ploszajzak\, and J. Okolowiz\, PRC 67\
, 054311 (2003). [2] A. Volya and V. Zelevinsky\, PRL 94\, 052501 (2005).
[3] S. Baroni\, P. Navratil\, S. Quaglioni\, PRC 87\, 034326 (2013). [4] G
. Rogachev\, et al.\, PRC 75\, 014603 (2007).\n\nhttps://indico2.riken.jp/
event/2536/contributions/11059/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11059/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Direct reaction mechanisms and fusion hindrance of light\, weakly-
bound nuclides
DTSTART:20180606T023900Z
DTEND:20180606T025700Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11060@indico2.riken.jp
DESCRIPTION:Speakers: Mahananda Dasgupta (Australian National University)\
, Edward Simpson (Australian National University)\, Sunil Kalkal (Thapar I
nstitute of Engineering and Technology)\, Kaitlin Cook (Australian Nationa
l University)\, David Hinde (Australian National University)\n\nNear-barri
er collisions involving light\, weakly-bound nuclei exhibit a diverse rang
e of reaction phenomenon\, including direct breakup\, nucleon transfer\, a
nd fusion. The interplay of these different mechanisms is of great intere
st\, since fusion reactions of 6\,7\,8Li\, 9Be and 10\,11B have been found
to be significantly suppressed\, by up to 35% [see 1 and refs. therein].
The root cause of this suppression is believed to be direct reaction proc
esses\, which cause disintegration of the projectile into clusters. If on
ly part of the projectile is then captured (incomplete fusion)\, then comp
lete fusion will be reduced. A strong correlation between the lowest ener
gy direct breakup threshold QBU and the degree of fusion suppression [1]\,
suggests that direct breakup into intrinsic clusters (e.g.\, 6He=α+2n\,
7Li=α+t) is the culprit. The reality is more subtle: transfer reactions
can also trigger projectile disintegration [2\,3]\, and in some cases tran
sfer dominates over direct breakup.\n\nHere we consider stochastic classic
al dynamical models (SCDMs)\, which can treat both direct and transfer-tri
ggered breakup simultaneously\, and make predictions for above-barrier rea
ction outcomes [4\,5]. SCDMs follow the classical trajectory of the proje
ctile and target R(t)\, which is stochastically sampled to determine a loc
ation of breakup given some assumed probability function PBU(R) [4\,5\,6].
The resulting breakup fragments are then propagated in the field of the
target-like nucleus\, until they fuse or escape. By constraining PBU(R) u
sing sub-barrier breakup\, above-barrier reaction outcomes can be predicte
d.\n\nThe development of SCDMs has also clarified the crucial role that nu
clear structure plays. Since the formation of a compound nucleus takes ju
st 10-21 seconds\, if breakup is to suppress fusion\, it must occur prompt
ly: narrow resonance states will not decay fast enough [3]. Understanding
the mechanisms for prompt breakup requires careful analysis of the measur
ed energy and angle correlations of the fragments\, but suggests that (a)
prompt breakup following direct excitation (e.g.\, 7Li to α+t) occurs qui
ckly [6]\, whereas (b) prompt breakup following transfer to broad resonanc
es is delayed\, and cannot explain the observed fusion [5\,7].\n\nWe discu
ss this key topic in near-barrier reactions via reactions of 7Li\, where b
oth direct and transfer-induced are strong\, and consider whether the phen
omenon is likely to persist in light exotic systems such as 6He\, 7Be\, an
d 8B.\n\n[1] Wang et al.\, Phys. Rev. C 90\, 034612 (2014).\n[2] Shrivasta
va et al.\, Phys. Letts. B\, 633\, 463 (2006).\n[3] Luong et al.\, Phys. L
etts. B 695\, 105 (2013)\n[4] Diaz Torres et al.\, Phys. Rev. Letts. 98\,
152701 (2007)\n[5] Simpson et al.\, Phys. Rev. C 93\, 024695 (2016)\n[6] K
alkal et al.\, Phys. Rev. C 93\, 044605 (2016)\n[7] Cook et al.\, Phys. Re
v. C 93\, 064604 (2016)\n\nhttps://indico2.riken.jp/event/2536/contributio
ns/11060/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11060/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Assessing the foundation of the Trojan Horse Method
DTSTART:20180606T000000Z
DTEND:20180606T001800Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11064@indico2.riken.jp
DESCRIPTION:Speakers: Stefan Typel (TU-Darmstadt)\, Mahir Hussein (Univers
ity of Sao Paulo)\, Carlos Carlos Bertulani (Texas A&\;M University-Com
merce)\n\nI will discuss the foundation of the Trojan Horse Method (THM) w
ithin the Inclusive Non-Elastic Breakup (INEB) theory. This work demonstra
tes that the direct part of the INEB cross section\, which is of two-step
character\, becomes\, in the DWBA limit of the three-body theory with appr
opriate approximations and redefinitions\, similar in structure to the one
-step THM cross section. I will also discuss the connection of the THM to
the Surrogate Method (SM)\, which is a genuine two-step process.\n\nhttps:
//indico2.riken.jp/event/2536/contributions/11064/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11064/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of 19C using single-neutron knockout
DTSTART:20180607T003600Z
DTEND:20180607T005400Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11066@indico2.riken.jp
DESCRIPTION:Speakers: Jongwon Hwang (Center for Nuclear Study\, University
of Tokyo)\n\nThe evolution of shell structure toward the driplines is a s
ubject of importance in nuclear physics. For a half decade the p-sd-shell
nuclei have been a useful tool for expanding our understanding of shell ev
olution. 19C is one of those nuclei\, well known as the s-wave halo ground
state. While the low-lying excited states with 3/2+ and 5/2+ were identif
ied by experimental studies\, there exists an argument of bound nature of
5/2+1. From a theoretical point of view\, shell model calculations with di
fferent interactions show discrepancy in location and ordering of levels.\
n\nWe investigated the neutron-unbound states of 19C using the one-neutron
knockout reaction with SAMURAI spectrometer at RIBF\, RIKEN. The 20C beam
impinged on a carbon target to produce 19C. The decay products\, 18C and
a neutron\, were detected using SAMURAI and NEBULA neutron array.\n\nIn th
is talk\, the observation of populated states and the discussion in the co
ntext of shell-model calculations will be reported.\n\nhttps://indico2.rik
en.jp/event/2536/contributions/11066/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11066/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Manifestation of α-clustering in 10Be via α-knockout reaction
DTSTART:20180606T005400Z
DTEND:20180606T011200Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11067@indico2.riken.jp
DESCRIPTION:Speakers: Kazuki Yoshida (research center for nuclear physics)
\, Kazuyuki Ogata (RCNP\, Osaka University)\, Mengjiao Lyu (RCNP\, Osaka U
niversity)\, Yoshiko Kanada-En'yo (Kyoto University)\n\nDespite the remark
able successes obtained by the cluster models\, the physical observables t
hat are directly related to the cluster degree of freedom is not available
until very recent studies of α-transfer reactions and α-knockout reacti
ons. We introduce the microscopic structure models into the theoretical fr
ameworks for α-knock out reactions to probe the α-clustering in 10Be nuc
leus. In this work\, we integrate the THSR wave function and the distorted
wave impulse approximation (DWIA) framework\, and make calculation for th
e 10Be(p\,pα)6He reaction at 250MeV. We predict the triple differential c
ross sections (TDX). We further construct artificial states with extreme s
hell-model like or gas like states for the target nucleus 10Be\, and find
the strong dependence of the TDX on the α-clustering structure. With this
new framework\, we may directly relate the microscopic description of α-
clustering structure to the reaction observables in the (p\,pα) knockout
reaction\, and provide sensitive manifestation of α-clustering in the 10B
e nucleus. We are further extending this framework to the α-knockout reac
tion for the 12Be nucleus.\n\nhttps://indico2.riken.jp/event/2536/contribu
tions/11067/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11067/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Total cross sections of reactions 6\,8He+28Si\, 9\,11Li+28Si and r
ole of neutron rearrangement
DTSTART:20180604T070900Z
DTEND:20180604T072700Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11068@indico2.riken.jp
DESCRIPTION:Speakers: Mikhail Naumenko (Joint Institute for Nuclear Resear
ch)\, Viacheslav Samarin (Joint Institute for Nuclear Research)\, Yuri Pen
ionzhkevich (Joint Institute for Nuclear Research)\n\nIt is well known tha
t neutron rearrangement may play an important role in nuclear reactions. T
he aim of this work is the investigation of the reactions with light nucle
i having different external neutron shells. A series of experiments on mea
surement of total cross sections for reactions 4\,6\,8He + Si and 6\,7\,9\
,11Li + Si in the beam energy range 5–50 AMeV was performed at Flerov La
boratory of Nuclear Reactions (FLNR)\, Joint Institute for Nuclear Researc
h (JINR). The interesting results were the unusual enhancements of total c
ross sections for 9\,11Li + Si reactions as compared with 6\,7Li + Si reac
tions and 6\,8He + Si reactions as compared with 4He + Si reaction. The mi
croscopic approach based on the numeric solution of the time-dependent Sch
rödinger equation [1] for the external neutrons of weakly bound projectil
e nuclei combined with the optical model is used for description of the ob
served effects [2]. These are explained by the rearrangement of external n
eutrons and thus the increase of neutron probability density in the region
between the two nuclei depending on the collision energy. The calculated
cross sections are in agreement with the experimental data on the total re
action cross sections for the studied nuclei.\n\nReferences\n[1] V. V. Sam
arin. Description of nucleon-transfer and fusion reactions within time-dep
endent approaches and coupled-channel method. Phys. At. Nucl. 78 128 (2017
).\n[2] Yu. E. Penionzhkevich\, Yu. G. Sobolev\, V. V. Samarin\, and M. A.
Naumenko. Peculiarities in total cross sections of reactions with weakly
bound nuclei 6He\, 9Li. Phys. At. Nucl. 80 928 (2017).\n\nhttps://indico2.
riken.jp/event/2536/contributions/11068/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11068/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Benchmarking reaction theories for nucleon knockout reactions
DTSTART:20180606T001800Z
DTEND:20180606T003600Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11070@indico2.riken.jp
DESCRIPTION:Speakers: Kazuki Yoshida (RCNP\, Osaka University)\, Antonio M
oro (Universidad de Sevilla)\, Kazuyuki Ogata (RCNP\, Osaka University)\,
Mario Gómez Ramos (Universidad de Sevilla)\n\nRecently\, proton-induced n
ucleon knockout reactions\, (p\,pN)\, have been utilized for the nucleon s
pectroscopy of nuclei\, for unstable nuclei in the inverse kinematics in p
articular. In this study the benchmarking of the three reaction theories f
or describing the (p\,pN) reaction has been done. The momentum distributio
ns calculated with the distorted wave impulse approximation (DWIA) and the
transfer-to-the-continuum model (TC) for the 15C(p\,pn)14C reaction at 42
0 MeV/u have been compared with the already published results of the Fadde
ev/AGS (FAGS) method. The same inputs are adopted to three reaction calcul
ations as much as possible.\nAs a result\, a very good agreement has been
found between DWIA\, TC and FAGS. Within the DWIA framework\, the energy d
ependence of the distorting potentials\, which is difficult to be taken in
to account in the TC and FAGS frameworks\, is found to affect in a modest
way on the shape and magnitude of the momentum distributions. However\, it
is found that the inclusion of relativistic corrections increases the kno
ckout cross section by about 30%\, which shows the importance of that trea
tment for deducing the spectroscopic information from the (p\, pN) cross s
ections.\n\nhttps://indico2.riken.jp/event/2536/contributions/11070/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11070/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Three-body correlations in direct reactions: Example of 6Be popula
ted in (p\, n) reaction
DTSTART:20180605T001800Z
DTEND:20180605T003600Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11069@indico2.riken.jp
DESCRIPTION:Speakers: Vratislav Chudoba for ACCULINNA collaboration (JINR
Dubna\, Russia &\;&\; Silesian University in Opava\, Czech Republic)
\n\nThe nuclear driplines are defined by instability with respect to parti
cle emission\, and therefore the entire spectra of the systems beyond the
driplines are continuous. The first emission threshold in the light even s
ystems is often\, due to pairing interaction\, the threshold for two-neutr
on or two-proton emission\, and therefore one has to deal with three-body
continuum. Such continuum provides rich information about nuclear structur
e of ground state and continuum excitations\, which is\, however\, often t
ightly intertwined with contributions of reaction mechanism. The way to ex
tract this information is to explore the world of various correlations in
fragment motions and to look for methods to disentangle contributions of a
reaction mechanisms.\n\nThe 47 AMeV 6Li beam was produced by the cyclotro
n U-400M and injected into ACCULINNA facility [1]. The 6Be continuum state
s were populated in the charge-exchange reaction 1H(6Li\,6Be)n collecting
very high statistics data (~5x10^6 events) on the three-body alpha+p+p coi
ncidences. The first results of the experiment studying the α+p+p correla
tions in decays of the 6Be states populated in the (p\, n) charge-exchange
reaction were published in Ref. [2]. The paper was focused on the proof t
hat the observed 6Be excitation spectrum above ~3 MeV is dominated by the
novel phenomenon – isovector breed of the soft dipole mode “built” o
n the 6Li ground state (g.s.). The correlations in the decay of 6Be states
with excitation energy below ~3 MeV\, where the data are dominated by th
e contributions of the known and well-understood 0+ and 2+ states of 6Be\,
are presented.\n\nA general quantum-mechanical formal issue and important
practical task of data interpretation is the extraction of the most compl
ete quantum-mechanical information from the accessible observables. Import
ant but very rare case when extraction of the complete quantum-mechanical
information from data is possible is elastic scattering: from angular dist
ributions one can\, in principle\, extract set of phase shifts which conta
ins all possible information about this process. For the majority of other
classes of experimental data\, extraction of complete quantum-mechanical
information is not possible. For certain classes of reactions the most com
plete quantum-mechanical information which can be extracted is contained i
n the density matrix. Because of internal symmetries the density matrix co
uld provide very compact form of data representation depending just on ver
y few parameters. \n\nWe demonstrate that basing on the known level scheme
it is possible to extract the maximal possible quantum mechanical informa
tion about reaction mechanism (e.g. the density-matrix parameters) from th
e three-body correlations. It is demonstrated how the high-statistics few-
body correlation data can be used to extract detailed information on the r
eaction mechanism. The suggested method of analysis allows for identificat
ion of such fine effects like the ratio of the populated states\, interfer
ence between them and alignment of the states with J>1/2 for other nuclei\
, and it may be regarded as a general tool for different tasks on radioact
ive beams.\n\n[1] A. M. Rodin\, S. I. Sidorchuk\, S. V. Stepantsov\, G. M.
Ter-Akopian\, A. S. Fomichev\, R. Wolski\, V. B. Galinskiy\, G. N. Ivanov
\, I. B. Ivanova\, V. A. Gorshkov\, A. Y. Lavrentev\, and Y. T. Oganessian
\, Nuclear Instruments and Methods in Physics Research A 391\, 228 (1997)\
n[2] A. Fomichev\, V. Chudoba\, I. Egorova\, S. Ershov\, M. Golovkov\, A.
Gorshkov\, V. Gorshkov\, L. Grigorenko\, G. Kaminski\, S. Krupko\, I. Mukh
a\, Y. Parfenova\, S. Sidorchuk\, R. Slepnev\, L. Standylo\, S. Stepantsov
\, G. Ter-Akopian\, R. Wolski\, and M. Zhukov\, Physics Letters B 708\, 6
(2012)\n\nhttps://indico2.riken.jp/event/2536/contributions/11069/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11069/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Direct Measurement of Resonances in 7Be(&alpha\;\,&
gamma\;)11C With DRAGON
DTSTART:20180605T075400Z
DTEND:20180605T081200Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11072@indico2.riken.jp
DESCRIPTION:Speakers: Devin Connolly (TRIUMF)\, Matthew Williams (Universi
ty of York\, TRIUMF)\, William Huang (University of Northern British Colum
bia)\, Matthew Lovely (Colorado School of Mines)\, Barry Davids (TRIUMF)\,
Gwenaelle Gilardy (University of Notre Dame)\, Jonathan Karpesky (Colorad
o School of Mines)\, Chris Ruiz (TRIUMF\, University of Victoria)\, Athana
sios Psaltis (McMaster University)\, Johnson Liang (McMaster University)\,
Alan Chen (McMaster University)\, Rekam Giri (Ohio University)\, Gaurav T
enkila (University of British Columbia)\, Uwe Greife (Colorado School of M
ines)\, Nicholas Esker (TRIUMF)\, Som Paneru (Ohio University)\, Annika Le
nnarz (TRIUMF)\, Dave A. Hutcheon (TRIUMF)\n\nNucleosynthesis of the p-nuc
lei is one of the remaining unsolved puzzles in nuclear astrophysics. One
possible mechanism for production of p-nuclei is the νp-process\, which i
s thought to occur in the ejecta of core-collapse supernovae. A recent stu
dy found that the p-p chain breakout reaction 7Be(α\,γ)11C significantly
influences nuclear flow in the νp-process. However\, the 7Be(α\,γ)11C
reaction rate is poorly known over the temperature range of interest (T=1.
5−3 GK). In this temperature range\, the astrophysical reaction rate is
dominated by resonant capture to states in 11C within the Gamow window\, t
hree of which have unknown resonance strengths. A new direct measurement o
f 7Be(α\,γ)11C was performed at TRIUMF's DRAGON recoil separator in orde
r to measure the strengths and energies of these resonances. Experimental
methods and preliminary results will be discussed.\n\nhttps://indico2.rike
n.jp/event/2536/contributions/11072/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11072/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Measurement of $^{77\,79}$Se(d\,p) reactions in inverse kinematics
at OEDO
DTSTART:20180607T025400Z
DTEND:20180607T031200Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11073@indico2.riken.jp
DESCRIPTION:Speakers: Daisuke Suzuki (Department of Physics\, University o
f Tokyo)\, Susumu Shimoura (CNS\, University of Tokyo)\, Shin'ichiro MICHI
MASA (CNS\, Univ. of Tokyo)\, Kathrin Wimmer (The University of Tokyo)\, M
asanori Dozono (Center for Nuclear Study\, the University of Tokyo)\, Phil
ipp Schrock (CNS\, University of Tokyo)\, Shinsuke Ota (Center for Nuclear
Study\, University of Tokyo)\, Toshiyuki Sumikama (RIKEN Nishina Center)\
, Nobuaki IMAI (CNS\, Univ. of Tokyo)\n\nA new beam line named OEDO which
can degrade the beam energy and squeeze the spatial distribution was insta
lled at RIBF. As the first campaign of the experiments\, $^{77\,79}$Se(d\,
p)$^{X}$Se reactions were measured as a surrogate of the $^{79}$Se($n\, \\
gamma$)$^{80}$Se* reaction for the nuclear mutation of the radioactive was
te of $^{79}$Se. The $\\gamma$ transition probabilities from the unbound s
tates of $^{78\,80}$Se were determined by directly measuring the outgoing
particles instead of detecting the $\\gamma$ rays. In this talk\, we will
explain the experimental setup and the preliminary result on the ($n\,\\ga
mma$) cross sections.\n\nhttps://indico2.riken.jp/event/2536/contributions
/11073/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11073/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Microscopic description of global optical potential toward unstabl
e nucleus
DTSTART:20180605T053600Z
DTEND:20180605T055400Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11082@indico2.riken.jp
DESCRIPTION:Speakers: Kosuke Tsubakihara (Tokyo Institute of Technology)\,
Takenori Furumoto (Yokohama National University)\, Wataru Horiuchi (Hokka
ido University)\, Shuichiro Ebata (Tokyo Institute of Technology)\n\nThe o
ptical model potential has an aspect of useful tool to analyze the nuclear
reaction data of the non-elastic scattering. Therefore\, the construction
of the optical model potential is developed. Nowadays\, the microscopic d
escription based on the realistic nucleon-nucleon interaction is advanced
to construct the optical model potential. The microscopic optical potentia
l is success to describe not only the elastic scattering but also inelasti
c scattering and transfer reaction and so on.\nIn this talk\, we will intr
oduce the microscopic global optical potential for the nucleon-nucleus sys
tems. The microscopic global optical potential is based on the single-fold
ing model with the complex G-matrix interaction. The microscopic global op
tical potential is designed for the nucleon-nucleus systems including the
unstable nucleus at E = 50-400 MeV.\n\nhttps://indico2.riken.jp/event/2536
/contributions/11082/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11082/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A POSSIBLE NUCLEAR SOLUTION TO THE 18F DEFICIENCY IN NOVAE
DTSTART:20180605T071800Z
DTEND:20180605T073600Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11077@indico2.riken.jp
DESCRIPTION:Speakers: marco la cognata (infn-lns)\n\nA POSSIBLE NUCLEAR SO
LUTION TO THE 18F DEFICIENCY IN NOVAE\n\nM. La Cognata1\, R. G. Pizzone1\,
J. José2\,3\, M. Hernanz3\,4\, S. Cherubini1\,5\, M. Gulino1\,6\, G. G.
Rapisarda1\,5\, and C. Spitaleri1\,5\n\n1 INFN - Laboratori Nazionali del
Sud\, Catania\, Italy\n2 Departament de Física\, EEBE\, Universitat Polit
ècnica de Catalunya\, E-08019 Barcelona\, Spain\n3 Institut d’Estudis E
spacials de Catalunya\, E-08034 Barcelona\, Spain\n4 Institut de Ciencies
de l’Espai (ICE-CSIC). Campus UAB. c/ Can Magrans s/n\, E-08193 Bellater
ra\, Spain \n5 Dipartimento di Fisica e Astronomia\, Università degli Stu
di di Catania\, Catania\, Italy\n6 Facoltà di Ingegneria ed Architettura\
, Kore University\, Viale delle Olimpiadi\, 1\, I-94100 Enna\, Italy\n\nCr
ucial information on nova nucleosynthesis can be potentially inferred from
γ-ray signals powered by 18F decay [1]. Therefore\, the reaction network
producing and destroying this radioactive isotope has been extensively st
udied in the last years. Among those reactions\, the 18F(p\,α)15O cross-s
ection has been measured by means of several dedicated experiments\, both
using direct and indirect methods. The presence of interfering resonances
in the energy region of astrophysical interest has been reported by many a
uthors including the recent applications of the Trojan Horse Method (THM).
The THM is an indirect method using direct reactions to populate 19Ne sta
tes of astrophysical importance\, with no suppression by the Coulomb and c
entrifugal barriers. In this work\, we evaluate what changes are introduce
d by the Trojan Horse data [2-4] in the 18F(p\,α)15O astrophysical factor
recommended in a recent R-matrix analysis\, accounting for existing direc
t and indirect measurements [5]. We will particularly focus on the role of
the THM experiment\, since it allowed us to cover the 0-1 MeV energy rang
e with experimental data\, with no need of extrapolation and with unpreced
ented accuracy. Then\, the updated reaction rate is calculated and paramet
erized and implications of the new results on nova nucleosynthesis are tho
roughly discussed. In particular\, while no change on the dynamical proper
ties of the explosion is found due to the revised reaction rate\, importan
t differences in the chemical composition of the ejected matter is observe
d\, with a net reduction in the mean 18F content by a factor of 2 and a co
rresponding increase in the detectability distance [4].\n\n[1] J. José\,
Stellar Explosions: Hydrodynamics and Nucleosynthesis (Boca Raton\, FL\, L
ondon: CRC/Taylor and Francis\, 2016)\n[2] R. G. Pizzone et al.\, Eur. Phy
s. J. A\, 52 (2016) 24 \n[3] S. Cherubini et al.\, Physical Review C\, 92
(2015) 015805\n[4] M. La Cognata et al.\, The Astrophysical Journal\, 846
(2017) 65\n[5] D. W. Bardayan et al. 2015\, Phys. Lett. B\, 751\, (2015) 3
11\n\nhttps://indico2.riken.jp/event/2536/contributions/11077/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11077/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complete Glauber calculations for high-energy inelastic processes
DTSTART:20180608T003600Z
DTEND:20180608T005400Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11080@indico2.riken.jp
DESCRIPTION:Speakers: Taku Nagahisa (Hokkaido University)\, Shinya Hatakey
ama (Hokkaido University)\, Wataru Horiuchi (Hokkaido University)\n\nThe G
lauber theory is a powerful and widely used method to describe\nhigh energ
y nuclear collisions. Since the complete evaluation\nof the so-called Glau
ber amplitude is much involved\,\napproximate treatment has often been mad
e.\nIn this contribution\, we present our recent developments \nof the Gla
uber model calculations for\nnuclear inelastic processes. The Monte Carlo
and the factorization methods are employed in order to evaluate the Glaube
r amplitude which involves a multi-dimensional integral.\nThe power of the
complete Glauber calculations is demonstrated\nby showing some examples:\
nThe total reaction cross sections of 22C [1]\,\nand the inelastic cross s
ections involving deformed nuclei [2].\n\n[1] T. Nagahisa and W. Horiuchi\
, in preparation.\n[2] S. Hatakeyama and W. Horiuchi\, in preparation.\n\n
https://indico2.riken.jp/event/2536/contributions/11080/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11080/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mirror energy differences and neutron skin
DTSTART:20180607T070000Z
DTEND:20180607T071800Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11084@indico2.riken.jp
DESCRIPTION:Speakers: Silvia M. Lenzi (University of Padova and INFN)\n\nI
sospin symmetry is one of the basic concepts in nuclear physics. One of it
s consequences is that the level scheme of mirror nuclei\, i.e. nuclei wit
h the same number of nucleons but interchanged number of protons and neutr
ons should be identical. The Coulomb excitation breaks this degeneracy to
some extent. It is also known that at the strong interaction level\, the s
ymmetry is also broken and manifested in the difference in mass of protons
and neutrons and in the nucleon-nucleon scattering phase shifts.\nNew dev
elopments in the study of the mirror energy differences in the sd shell su
ggest that these observables can give information on the nuclear skin as a
function of excitation energy. The calculations are performed in the shel
l model framework using state-of-the-art charge-dependent nucleon-nucleon
potentials. \nIn the presentation some new data together with the calculat
ions will be shown and discussed.\n\nhttps://indico2.riken.jp/event/2536/c
ontributions/11084/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11084/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Welcome speech
DTSTART:20180604T000000Z
DTEND:20180604T000500Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11415@indico2.riken.jp
DESCRIPTION:Speakers: Kazuyuki Ogata\n\nhttps://indico2.riken.jp/event/253
6/contributions/11415/
URL:https://indico2.riken.jp/event/2536/contributions/11415/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Single-particle states and collective modes: results from magnetic
moment measurement of 75mCu
DTSTART:20180604T023900Z
DTEND:20180604T025700Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11097@indico2.riken.jp
DESCRIPTION:Speakers: Yuichi Ichikawa (RIKEN Nishina Center)\n\nThe atomic
nuclei have dual features\, the single-particle shell nature and collecti
ve modes\, which are competing with each other to express the actual nucle
ar structure. Here we demonstrate the precision analysis of this competiti
on by focusing on the magnetic moment of an isomeric state of a neutron-ri
ch nucleus 75Cu\, where an intriguing shell evolution has been reported.\n
The experimental magnetic moment measurement was carried out at RIBF\, tak
ing advantage of a spin-aligned RI beam obtained in a two-step projectile
fragmentation scheme. The 75Cu beam with spin alignment reaching 30% was p
roduced by one-proton removal from a secondary beam of 76Zn. The magnetic
moment was determined by means of TDPAD method. \nIn this presentation\, t
he production of spin alignment in the two-step fragmentation scheme will
be introduced and the experimental results will be presented. Discussion o
n the above competition at the neutron-rich Ci isotopes\, analyzed with th
e Monte-Carlo shell model calculation\, will also be given.\n\nhttps://ind
ico2.riken.jp/event/2536/contributions/11097/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11097/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Welcome speech
DTSTART:20180604T000500Z
DTEND:20180604T001000Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11416@indico2.riken.jp
DESCRIPTION:Speakers: Kotaro Yamada (Tokyo Institute of Technology)\n\nhtt
ps://indico2.riken.jp/event/2536/contributions/11416/
URL:https://indico2.riken.jp/event/2536/contributions/11416/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Search for T=5 isobaric analog states in 48Ca
DTSTART:20180607T061200Z
DTEND:20180607T063000Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11092@indico2.riken.jp
DESCRIPTION:Speakers: Nabin Rijal (Florida State University)\, Yevgen Kosh
chiy (Cyclotron Institute - Texas A&M University)\, Daniel Santiago-Gonzal
ez (Louisiana State University)\, Grigory Rogachev (Cyclotron Institute -
Texas A&M University)\, Catherine Deibel (Louisiana State University)\, Ju
stin Browne (NSCL\, Michigan State University)\, Sriteja Upadhyayula (Cycl
otron Institute - Texas A&\;M University)\, Sunghoon Ahn (Cyclotron Ins
titute - Texas A&M University)\, Shadi Bedoor (Cyclotron Institute - Texas
A&M University)\, Jon Lighthall (Louisiana State University)\, Joshua Hoo
ker (Texas A&\;M University - Cyclotron Institute)\, Curtis Hunt Hunt (
Texas A&\;M University - Physics and Astronomy)\, Maria Anastasiou (Flo
rida State University)\, Wei Jia Ong (NSCL\, Michigan State University)\,
Ashley Hood (Louisiana State University)\, Jeffrey Blackmon (Louisiana Sta
te University)\n\nParticle-hole excitations near closed shells carry infor
mation on single-particle energies and on two-body interactions. The parti
cle-hole excitations near the doubly magic nuclei are of special interest.
Information on the charge-changing particle-hole excitations (T= 5 negati
ve parity states) in $^{48} $ Ca is not available. We performed an experim
ent to establish the level scheme of the low-lying negative parity T= 5 st
ates in $^{48} $ Ca. Excitation functions for the $^{1} $ H ($^{47} $ K\,
p) $^{47} $ K (gs) and $^{1} $ H ($^{47} $ K\, p) $^{47} $ K (3/2$^+ $) re
actions in the cm energy range from 1 MeV to 4.5 MeV were measured. The T=
5 states are expected to show up in the p+ $^{47} $ K excitation function
as narrow resonances. This experiment was performed at NSCL using the ReA
3 beam of $^{47} $ K at energy of 4.6 MeV/u. ANASEN\, set in active target
mode\, was used for this experiment. Experimental results from this exper
iment will be presented.\n\nhttps://indico2.riken.jp/event/2536/contributi
ons/11092/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11092/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nuclear structure study for the neutron-rich cadmium nuclei beyond
132Sn
DTSTART:20180605T023600Z
DTEND:20180605T025400Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11089@indico2.riken.jp
DESCRIPTION:Speakers: Shunji Nishimura (RIKEN Nishina Center)\, Nori AOI (
RCNP\, Osaka Univ.)\, Ken-ichiro YONEDA (RIKEN Nishina Center)\, Hongna Li
u (CEA Saclay)\, Avigo Riccardo (INFN)\, Megumi NIIKURA (Department of Phy
sics\, the University of Tokyo)\, Zoltan Elekes (MTA ATOMKI)\, Andrea Jung
claus (Instituto de Estructura de la Materia - CSIC)\, Alexandre Obertelli
(TU Darmstadt)\, David Steppenbeck (RIKEN Nishina Center)\, Zsolt VAJTA (
MTA Atomki)\, Clementine Santamaria (NSCL\, MSU)\, Jenny Lee (The Universi
ty of Hong Kong)\, He Wang (RIKEN Nishina Center)\, Pieter Doornenbal (RIK
EN)\, Hideaki Otsu (RIKEN Nishina Center)\, Hidetada Baba (RIKEN)\, Tohru
Motobayashi (RIKEN Nishina Center)\, Zhengyu Xu (University of Tokyo)\, To
shiyuki Sumikama (RIKEN Nishina Center)\, Tetsuya Yamamoto (RCNP)\, Eiji I
deguchi (RCNP\, Osaka University)\, Jin Wu (RIKEN)\, Christopher Bauer (TU
Darmstadt)\, Satoshi TAKEUCHI (Tokyo Institute of Technology)\, Ryo Taniu
chi (Department of Physics\, Graduate School of Science\, The University o
f Tokyo)\, Satoru Momiyama (Department of Physics\, University of Tokyo)\,
Tadaaki Isobe (RIKEN)\, Pär-Anders Söderström (RIKEN Nishina Center)\,
Masafumi Matsushita (Center for Nuclear Study\, University of Tokyo)\, Hi
royoshi Sakurai (RIKEN Nishina Center for Accelerator-Based Science)\, Zso
lt Dombradi (MTA ATOMKI)\n\nNuclear structure study for exotic nuclei far
away the stability is one of major topics in today’s nuclear physics res
earch. In particular\, the neutron-rich nuclei beyond 132Sn provide a pivo
t region to explore the exotic nuclear structure because 132Sn is doubly m
agic and locates far away the stability. In this region\, two phenomena in
nuclear structure have attracted much attention in recent years: the pers
istence of N=82 shell gap in the nuclei locating at the south of 132Sn and
neutron dominance nature in the 2+ excitation in Te and Sn beyond N=82. \
n\nTo address these two questions\, neutron-rich cadmium isotopes are crit
ical. For N=82 shell gap\, mass measurement and spectroscopic studies show
contradictory results for 130Cd (Z=48\,N=82). While a reduced N=82 shell
gap is deduced from the mass measurements on 130\,131Cd\, spectroscopic st
udy suggests a good N=82 shell closure because the first 2+ state 130Cd is
comparable to other N=82 isotones. For the neutron dominance nature\, the
first 2+ state in 132Cd (Z=48\,N=84) is essential to investigate on the r
ole of neutron in low-lying excitation in more neutron-rich system. \n\nAi
ming at investigating the exotic nuclear structure beyond 132Sn\, we have
measured reduced transition possibility B(E2) for the semi-magic nucleus 1
30Cd and 2+ state in 132Cd at the RI Beam Factory. Coulomb excitation at a
round 160MeV/u was applied to obtain the B(E2) value in 130Cd and the two-
proton removal reaction was used to produce the 2+ state in 132Cd. Gamma r
ays emitted from the excited states were measured via the DALI2 spectromet
er. In the presentation\, the newly obtained BE2 value and 2+ state for 13
0Cd and 132Cd\, respectively\, will be discussed and experimental details
will be given.\n\nhttps://indico2.riken.jp/event/2536/contributions/11089/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11089/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of 19Ne using the 15O + alpha experiment
DTSTART:20180605T081200Z
DTEND:20180605T083000Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11090@indico2.riken.jp
DESCRIPTION:Speakers: Dahee Kim (Department of Physics\, Ewha Womans Unive
rsity\, Seoul\, Korea)\, J. Y. Moon (RISP\, Institute of Basic Science\, D
aejeon\, Korea)\, O. Beliuskina (Center for Nuclear Study\, University of
Tokyo\, Wako\, Japan)\, S. M. Cha (Department of Physics\, SungKyunKwan Un
iversity\, Suwon\, Korea)\, K. Y. Chae (Department of Physics\, SungKyunKw
an University\, Suwon\, Korea)\, A. Kim (Department of Physics\, Ewha Woma
ns University\, Seoul\, Korea)\, A. A. Chen (Department of Physics and Ast
ronomy\, McMaster University\, Hamilton\, Canada)\, H. Yamaguchi (Center f
or Nuclear Study\, University of Tokyo\, Wako\, Japan)\, J. H. Lee (Depart
ment of Physics\, SungKyunKwan University\, Suwon\, Korea)\, S. W. Hong (D
epartment of Physics\, SungKyunKwan University\, Suwon\, Korea)\, Kevin In
sik Hahn (Department of Science Education\, Ewha Womans University\, Seoul
\, Korea)\, S. H. Hae (Department of Physics and Astronomy\, Seoul Nationa
l University\, Seoul\, Korea)\, S. Kubono (RIKEN\, Nishina Center\, Wako\,
Japan)\, N. Imai (Center for Nuclear Study\, University of Tokyo\, Wako\,
Japan)\, S. Y. Park (Department of Physics\, Ewha Womans University\, Seo
ul\, Korea)\, E. J. Lee (Department of Physics\, SungKyunKwan University\,
Suwon\, Korea)\, V. Panin (RIKEN\, Nishina Center\, Wako\, Japan)\, M. S.
Gwak (Department of Physics\, SungKyunKwan University\, Suwon\, Korea)\,
N. Kitamura (Center for Nuclear Study\, University of Tokyo\, Wako\, Japan
)\, Y. Wakabayashi (RIKEN\, Nishina Center\, Wako\, Japan)\, D. Kahl (Scho
ol of Physics and Astronomy\, University of Edinburgh\, Edinburgh\, United
Kingdom)\, S. H. Choi (Department of Physics and Astronomy\, Seoul Nation
al University\, Seoul\, Korea)\, S. Hayakawa (Center for Nuclear Study\, U
niversity of Tokyo\, Wako\, Japan)\, K. Abe (Center for Nuclear Study\, Un
iversity of Tokyo\, Wako\, Japan)\, E. K. Lee (CUP\, Institute of Basic Sc
ience\, Daejeon\, Korea)\, G. W. Kim (Department of Physics\, Ewha Womans
University\, Seoul\, Korea)\, Y. Sakaguchi (Center for Nuclear Study\, Uni
versity of Tokyo\, Wako\, Japan)\n\nClassical novae are one of the most en
ergetic stellar events in the Universe. In this site\, intense γ-rays due
to the beta decay of 18F produced are emitted by the HCNO cycle. The amou
nt of 18F is determined by two destructive channels 18F(p\,α)15O and 18F(
p\,γ)19Ne[1]. The reaction rates of the two destructive channels affect t
o the novae calculation model[2\,3]. For this reason\, many experiments an
d theoretical works have been reported on the resonances of 19Ne near and
above the proton threshold\, which can contribute to the reaction rate. Ho
wever\, many relevant parameters are still not measured.[4\,5] We performe
d alpha elastic scattering experiment with the radioactive 15O beam for in
vestigating the resonance parameters near the proton threshold using the t
hick target method at CRIB of the Center for Nuclear Study. The excitation
function of 19Ne was obtained between Ex=3.53 MeV and Ex=11.13 MeV. The e
xperimental details and results on the structure of 19Ne will be presented
.\n\n[1] M. Hernanz et al.\, Astrophys. J. 526\, L97 (1999). \n[2] S. Utku
et al.\, Phys. Rev. C 58\, 1354(E) (1998).\n[3] A. Coc et al.\,Astron. As
trophys. 357\, 561(2000).\n[4] A. St. J. Murphy et al.\, Phys. Rev. C 79\,
058801 (2009).\n[5] A. M. Laird et al.\, Phys. Rev. Lett. 110\, 032502 (2
013).\n\nhttps://indico2.riken.jp/event/2536/contributions/11090/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11090/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Keynote talk 1
DTSTART:20180604T001000Z
DTEND:20180604T004000Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11417@indico2.riken.jp
DESCRIPTION:Speakers: Alexandre Obertelli\n\nhttps://indico2.riken.jp/even
t/2536/contributions/11417/
URL:https://indico2.riken.jp/event/2536/contributions/11417/
END:VEVENT
BEGIN:VEVENT
SUMMARY:a new measurement of the intruder configuration in 12Be
DTSTART:20180605T021800Z
DTEND:20180605T023600Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11094@indico2.riken.jp
DESCRIPTION:Speakers: Jianling Lou (Peking University)\, Jie Chen (Argonne
lab)\n\nA new 11Be(d\,p)12Be transfer reaction experiment was carried out
in inverse kinematics at 26.9 MeV/nucleon\, with special efforts devoted
to the determination of the deuteron target thickness and of the required
optical potentials from the present elastic scattering data. In addition\,
a direct measurement of the cross section for the 02+ state was realized
by applying an isomer-tagging technique. The s-wave spectroscopic factors
of 0.20(0.04) and 0.41(0.11) were extracted for the 01+ and 02+ states\, r
espectively\, in 12Be. Using these spectroscopic factors\, together with
the previously reported results for the p-wave components\, the single-par
ticle component intensities in the bound 0+ states of 12Be were deduced\,
allowing a direct comparison with the theoretical predictions. It is evide
nced that the ground-state configuration of 12Be is dominated by the d-wa
ve intruder\, exhibiting a dramatic evolution of the intruding mechanism f
rom 11Be to 12Be\, with a persistence of the N = 8 magic number broken.\n\
nhttps://indico2.riken.jp/event/2536/contributions/11094/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11094/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Corrections to the eikonal description of elastic scattering and
breakup of halo nuclei
DTSTART:20180605T061200Z
DTEND:20180605T063000Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11093@indico2.riken.jp
DESCRIPTION:Speakers: Pierre Capel (Johannes Gutenberg-Universität Mainz)
\, Chloë Hebborn (Université libre de Bruxelles)\n\nIn the mid-80s\, the
development of Radioactive-Ion Beam (RIB) has enabled the study of nuclei
away from stability. Indeed\, these very short-lived nuclei cannot be stu
died through usual spectroscopic techniques but information about their s
tructure can be deduced from reaction measurements. To conduct a precise a
nalysis\, an accurate reaction model coupled to a realistic description of
the nuclei are required. The eikonal model provides reliable results at h
igh enough energies\, i.e. above 60A MeV\, while having a short computatio
nal time. Since facilities\, such as HIE-ISOLDE at CERN and ReA12 at MSU\,
aim to accelerate RIBs up to 10A MeV\, extending the range of validity of
the eikonal model to these energies would be of great interest. In this w
ork\, we study two corrections to the eikonal model in the framework of el
astic scattering and breakup reactions of halo nuclei. These corrections i
mprove the treatment of the Coulomb and nuclear interactions during the co
llision. The first is based on a semi-classical approach [1\,2] while the
second combines the partial-wave expansion and the eikonal model [3]. Cons
idering the case of the one-neutron halo projectile 11Be impinging on a 12
C target at 10A MeV\, we show that both corrections lead to elastic scatte
ring cross sections in excellent agreement with full CDCC calculations. Th
e extension of these corrections to breakup observables seems\, however\,
less successful. By showing the success and limitations of these correctio
ns\, we pinpoint more precisely the flaws of the eikonal approximation at
low energy. This will hopefully pave the way towards a more efficient corr
ection to the eikonal model at such energies. \n\n\n[1] C. E. Aguiar\, F.
Zardi\, and A. Vitturi\, Phys. Rev. C 56\, 1511 (1997).\n[2] C. Hebborn an
d P. Capel\, Phys. Rev. C 96\, 054607 (2017).\n[3] J. M. Brooke\, J. S. Al
-Khalili\, and J. A. Tostevin\, Phys. Rev. C 59\, 1560 (1999).\n\nhttps://
indico2.riken.jp/event/2536/contributions/11093/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11093/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Keynote talk 2
DTSTART:20180604T004000Z
DTEND:20180604T011000Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11418@indico2.riken.jp
DESCRIPTION:Speakers: A. M. Moro\n\nhttps://indico2.riken.jp/event/2536/co
ntributions/11418/
URL:https://indico2.riken.jp/event/2536/contributions/11418/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Effect of two-particle two-hole excitations in target nuclei on in
elastic differential cross sections
DTSTART:20180608T005400Z
DTEND:20180608T011200Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11102@indico2.riken.jp
DESCRIPTION:Speakers: Tokuro Fukui (INFN\, Napoli)\, Futoshi Minato (Japan
Atomic Energy Agency)\n\nA basic picture of nuclear excited states can be
described by one-particle one-hole (1p1h) excitation. Experimental data o
f inelastic scatterings of nucleon-nucleus reaction are reasonably reprodu
ced theoretically in this picture. However\, it is known that higher-order
configurations are important for a better understanding of the excited st
ates. This may apply to the inelastic scattering. However\, the relation b
etween higher-order configuration and inelastic scattering is still not cl
ear. To clarify the relation between higher-order configuration and inelas
tic scattering\, we consider two-particle two-hole (2p2h) excitation of ta
rget nuclei and pay attention to the angular differential cross sections.
The 2p2h stats of target nuclei are calculated by Second RPA\, and the rea
ction process is calculated by DWBA. As reaction channels\, inelastic scat
tering and (p\,n) reaction are chosen. Our approach reproduces experimenta
l data reasonably. However\, it turned out that the diffraction patterns o
f the angular differential cross section considering 2p2h excitation were
not significantly different from those considering 1p1h excitation althoug
h the absolute values were smaller than 1p1h calculation if the same nucle
on-nucleon force is used for 1p1h and 2p2h calculations. This indicates th
at the effect of 2p2h contribution cannot be seen in the inelastic channel
s. We discuss it in more detail from the nuclear structural point of view.
\n\nhttps://indico2.riken.jp/event/2536/contributions/11102/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11102/
END:VEVENT
BEGIN:VEVENT
SUMMARY:From Nuclei to Neutron Stars with a Microscopic Approach
DTSTART:20180605T070000Z
DTEND:20180605T071800Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11101@indico2.riken.jp
DESCRIPTION:Speakers: Francesca Sammarruca (University of Idaho)\n\nNeutro
n-rich systems are associated with a variety of important and still open q
uestions such as: the location of neutron drip lines\, the thickness of ne
utron skins\, and the structure of neutron stars. Common to these diverse
situations is the equation of state (EoS) of neutron-rich matter\, namely
the energy per particle in isospin-asymmetric matter as a function of dens
ity (and other thermodynamic quantities as appropriate\, such as temperatu
re). In the presence of different neutron and proton concentrations\, the
symmetry energy emerges as an important component of the EoS and plays an
outstanding role in the physics of neutron-rich systems.\n\nOur prediction
s of the EoS are based on microscopic high-precision nuclear interactions
derived from chiral Effective Field Theory (EFT) [1]. In recent years\, ch
iral EFT has evolved into the authoritative approach to construct nuclear
two- and many-body forces in a systematic manner [1\, 2].\nWe apply the mi
croscopic EoS of symmetric nuclear matter and the ones of pure neutron mat
ter as derived in Ref. [3]. The derivation is based on high-precision chir
al nucleon-nucleon potentials at next-to-next-to-next-to-leading order (N3
LO) of chiral perturbation theory [1\, 4]. The leading three-nucleon force
\, which is treated as an effective density-dependent force [5]\, is inclu
ded.\n\nIt is well known that the available information on neutron radii a
nd neutron skins is scarce and carry considerable uncertainty. Although fu
ture experiments are anticipated which should provide reliable information
on the weak charge density in 208Pb and 48Ca\, the identification of othe
r “observables” whose knowledge may give complementary information on
neutron skins would be most welcome. An issue of current interest is wheth
er information on the neutron skin can be obtained through the knowledge o
f proton radii alone\, specifically those of mirror nuclei. In particular\
, the difference between the charge radii of mirror nuclei in relation to
the slope of the symmetry energy\, and\, in turn\, to the neutron skin\, w
as nvestigated in Ref. [6]. Although phenomenological analyses are a usefu
l exploratory tool to gain some preliminary insight into sensitivities and
interdependences among nuclear properties\, only through microscopic pred
ictions can we understand a result in terms of the physical input. We will
explore\, from the microscopic point of view in contrast to the phenomeno
logical one\, the relation between the neutron skin of a nucleus\, on the
one hand\, and the difference between the proton radii of the mirror pair
with the same mass\, on the other.\n\nMoving on to a dramatically differen
t scale\, it is remarkable that the relation between the mass and the radi
us of neutron stars is uniquely determined by the EoS together with their
self-gravity. In fact\, these compact systems are intriguing testing groun
ds for nuclear physics. Most recently\, the detection by LIGO of gravitati
onal waves from two neutron stars spiraling inward and merging has generat
ed even more interest and excitement around these exotic systems. In fact\
, the LIGO/Virgo [7] detection of gravitational waves originating from the
neutron star merger GW170817 has provided new and more stringent constrai
nts on the maximum radius of a 1.4 M⊙ neutron star\, based on the tidal
deformabilities of the colliding stars [8]. We will present and discuss pr
edictions of neutron star masses and radii based\, as far as possible\, on
state-of-the-art nuclear forces. The focal point is the radius of a star
with mass equal to 1.4 M⊙ (the most probable mass of a neutron star)\, w
hich we wish to predict with appropriate quantification of the theoretical
error.\n\n[1] R. Machleidt and D.R. Entem\, Physics Report 503\, 1 (2011)
.\n[2] E. Epelbaum\, H.-W. Hammer\, and U.-G. Meissner\, Rev. Mod. Phys. 8
1\, 1773 (2009).\n[3] F. Sammarruca\, L. Coraggio\, J.W. Holt\, N. Itaco\,
R. Machleidt\, and L.E. Marcucci\, Phys. Rev. C 91\, 054311 (2015).\n[4]
D.R. Entem and R. Machleidt\, Phys. Rev. C 68\, 041001 (2003).\n[5] J.W. H
olt\, N. Kaiser\, and W. Weise\, Phys. Rev. C 79\, 054331 (2009)\;\n[6] B.
A. Brown\, Phys. Rev. Lett. 119\, 122502 (2017).\n[7] B.P. Abbott et al. [
LIGO Scientific and Virgo Collaborations]\, Phys. Rev. Lett. 119\, 161101
(2017).\n[8] Eemeli Annala\, Tyler Gorda\, Aleksi Kurkela\, and Aleksi Vuo
rinen\, arXiv:1711.02644 [astro-ph.HE]\; and references therein.\n\nhttps:
//indico2.riken.jp/event/2536/contributions/11101/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11101/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Single-particle structure of $^{93\,94\,95}$Sr nuclei
DTSTART:20180604T022100Z
DTEND:20180604T023900Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11065@indico2.riken.jp
DESCRIPTION:Speakers: P. Voss (Department of Chemistry\, Simon Fraser Univ
ersity\, Burnaby\, BC V5A 1S6\, Canada)\, A. B. Garnsworthy (TRIUMF\, Vanc
ouver\, BC V6T 2A3\, Canada)\, N. A. Orr (LPC\, ENSICAEN\, CNRS/IN2P3\, UN
ICAEN\, Normandie Universit\\'{e}\, 14050 Caen cedex\, France)\, P. C. Ben
der (TRIUMF\, Vancouver\, BC V6T 2A3\, Canada)\, C. E. Svensson (Departmen
t of Physics\, University of Guelph\, Guelph\, ON\, N1G 2W1\, Canada)\, C.
Andreoiu (Department of Chemistry\, Simon Fraser University\, Burnaby\, B
C V5A 1S6\, Canada)\, R. Braid (Department of Physics\, Colorado School of
Mines\, Golden\, CO 80401\, USA)\, A. Knapton (Department of Physics\, Un
iversity of Surrey\, Guildford\, Surrey\, GU2 7XH\, United Kingdom)\, M. M
archetto (TRIUMF\, Vancouver\, BC V6T 2A3\, Canada)\, D. Miller (TRIUMF\,
Vancouver\, BC V6T 2A3\, Canada)\, T. Bruhn (TRIUMF\, Vancouver\, BC V6T 2
A3\, Canada)\, R. Kanungo (Department of Astronomy and Physics\, Saint Mar
y’s University\, Halifax\, NS B3H 3C2\, Canada)\, C. S. Bancroft (Depart
ment of Physics\, Central Michigan University\, Mt Pleasant\, MI 48859\, U
SA)\, D. S. Cross (Department of Chemistry\, Simon Fraser University\, Bur
naby\, BC V5A 1S6\, Canada)\, F. Ames (TRIUMF\, Vancouver\, BC V6T 2A3\, C
anada)\, N. Sachmpazidi (Department of Physics\, Central Michigan Universi
ty\, Mt Pleasant\, MI 48859\, USA)\, A. Chester (TRIUMF\, Vancouver\, BC V
6T 2A3\, Canada)\, R. Kr\\"{u}cken (TRIUMF\, Vancouver\, BC V6T 2A3\, Cana
da)\, M. Moukaddam (TRIUMF\, Vancouver\, BC V6T 2A3\, Canada)\, W. N. Catf
ord (Department of Physics\, University of Surrey\, Guildford\, Surrey\, G
U2 7XH\, United Kingdom)\, R. Laxdal (TRIUMF\, Vancouver\, BC V6T 2A3\, Ca
nada)\, J. Lassen (TRIUMF\, Vancouver\, BC V6T 2A3\, Canada)\, N. Terpstra
(Department of Physics\, Central Michigan University\, Mt Pleasant\, MI 4
8859\, USA)\, C. Unsworth (TRIUMF\, Vancouver\, BC V6T 2A3\, Canada)\, A.
Cheeseman (TRIUMF\, Vancouver\, BC V6T 2A3\, Canada)\, C. Aa. Diget (Depar
tment of Physics\, University of York\, York\, YO10 5DD\, United Kingdom)\
, T. Drake (Department of Physics\, University of Toronto\, Toronto\, ON M
5S 1A7\, Canada)\, A. Sanetullaev (TRIUMF\, Vancouver\, BC V6T 2A3\, Canad
a)\, Soumendu Soumendu Sekhar Bhattacharjee (Post Doctoral Fellow at TIGRE
SS)\, K. Wimmer (Department of Physics\, The University of Tokyo\, Hongo\,
Bunkyo-ku\, Tokyo 113-0033\, Japan)\, W. Korten (IRFU\, CEA\, Universit\\
'{e} Paris-Saclay\, F-91191 Gif-sur-Yvette\, France)\, G. Hackman (TRIUMF\
, Vancouver\, BC V6T 2A3\, Canada)\, A. Matta (LPC\, ENSICAEN\, CNRS/IN2P3
\, UNICAEN\, Normandie Universit\\'{e}\, 14050 Caen cedex\, France)\, K. K
uhn (Department of Physics\, Colorado School of Mines\, Golden\, CO 80401\
, USA)\, S. Cruz (TRIUMF\, Vancouver\, BC V6T 2A3\, Canada)\n\nThe level s
tructure of neutron rich $^{93\,94\,95}$Sr were studied via the \\dtsr{94\
,95\,96}\, one neutron pickup reactions at TRIUMF. Excited states were pop
ulated when $^{94\,95\,96}$Sr beams of 5.5 AMeV bombarded a 0.5 mg/cm$^2$
CD$_2$ target. The de-exciting $\\gamma$-rays and outgoing charged particl
es were detected by using the TIGRESS and SHARC arrays\, respectively. The
level scheme was contructed by using both E$_x$ vs E$_{\\gamma}$ and E$_{
\\gamma}$ vs E$_{\\gamma}$ matrices. Three excited states were observed in
$^{93}$Sr and $^{95}$Sr\, respectively. A total of ten excited states wer
e observed in $^{94}$Sr of which four states were newly identified in the
present experiment. Angular distribution measurements suggest spin and par
ity assignments for the 1880 (0$^+$)\, 2294 (0$^+$) and 2415 (3$^+$) keV l
evels and constrain the other five levels 2615\, 2705\, 2921\, 3077 and 31
75 keV in $^{94}$Sr. In this work no $\\gamma$-ray transitions were observ
ed from the 1880 and 2294 keV levels directly to the ground state. This is
consistent with spin and parity assignments of the 1880 and 2294 keV leve
ls as 0$^+$. The spectroscopic factors were calculated by fitting DWBA cal
culations to experimental angular distribution data and taking into consid
eration $\\gamma$-decay branching ratios. Shell model calculations were ca
rried out to understand the present experimental observations by using upd
ated interaction and appropriate truncation schemes. The calculation was p
erformed by using an updated NuShellX code and $glek$ interaction. The sin
gle-particle energies of the interaction were adjusted in such a way that
the calculated and experimentally observed energy levels were in good agre
ement in the $N$ $\\sim$ 56 and $Z$ $\\sim$ 38 region. In the present calc
ulations the valence [$1d_{5/2}$]\, [$2s_{1/2}$]\, [$1d_{3/2}$] and [$0g_{
7/2}$] orbitals were included for neutrons outside the $N$ = 50 inert core
. The proton degrees of freedom were varied systematically so that the eff
ect of the proton valence space on the calculated levels could be studied.
The calculated energy levels and spectroscopic factors that were predicte
d are in reasonable agreement with the experimental findings. This suggest
s that the low-energy states are predominantly neutron configurations with
minor contributions from excitations between the proton [$1p_{3/2}$] and
[$1p_{1/2}$] orbitals.\n\nhttps://indico2.riken.jp/event/2536/contribution
s/11065/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11065/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Concluding remark
DTSTART:20180608T061500Z
DTEND:20180608T064500Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11419@indico2.riken.jp
DESCRIPTION:Speakers: Isao Tanihata\n\nhttps://indico2.riken.jp/event/2536
/contributions/11419/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11419/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of N=34 sub-shell closure in 54Ca from knock-out reaction
DTSTART:20180606T003600Z
DTEND:20180606T005400Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11074@indico2.riken.jp
DESCRIPTION:Speakers: Pieter Doornenbal (RIKEN)\, Sidong Chen (Peking Univ
ersity)\, Alexandre Obertelli (TU Darmstadt)\, Jenny Lee (The University o
f Hong Kong)\n\nThe structure of neutron-rich Ca isotopes have attracted i
nterest from both experimental and theoretical side for a decade. The N=32
sub-shell gap is found to be well established from the measured 2+ energy
in 52Ca[1]. Recently\, with the availability of intense radioactive beam\
, the N=34 sub-shell closure was also found experimentally in 54Ca[2]. To
quantitatively study the nature of N=34 sub-shell closure\, the spectrosco
pic factor of 54Ca(p\,pn) reaction is a useful index. Besides\, the 53Ca n
ucleus\, located in between 52Ca and 54Ca\, its single-particle properties
of low-lying states are of importance to the study of structures for very
neutron-rich Ca isotopes above 54Ca and shell evolution towards the poten
tial sub-shell closure nucleus 60Ca. We therefore performed 54Ca(p\,pn) ex
periment at the RIBF facility of the RIKEN Nishina Center.\n\nIn this expe
riment\, proton induced neutron knock-out cross sections from 54Ca ground
state to individual final states of 53Ca have been investigated. The in-be
am gamma-ray spectroscopy technique has been employed to tag the final sta
tes in 53Ca. The exclusive cross section as well as the residues momentum
distribution to individual final states have been measured. The spectrosco
pic factors deduced from the experimental knock-out cross sections and mom
entum distribution of the residues to individual final state will be compa
red to the reaction theory for quantitative structure study. In this repor
t\, the experimental setup as well as the preliminary result of data analy
sis will be presented.\n\n[1] A. Gade et al.\, Phys. Rev. C 74\,021302 (R)
(2006)\n[2] D. Steppenbeck et al.\, Nature\, 502\, 207-210\, (2013)\n\nht
tps://indico2.riken.jp/event/2536/contributions/11074/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11074/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Linking structure and dynamics in (p\,pN) reactions induced by Bor
romean nuclei
DTSTART:20180608T050600Z
DTEND:20180608T052400Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11030@indico2.riken.jp
DESCRIPTION:Speakers: Jesús Casal (ECT*)\, Antonio M. Moro (Universidad d
e Sevilla)\, Mario Gómez-Ramos (Universidad de Sevilla)\n\nOne-nucleon re
moval (p\,pN) reactions in inverse kinematics\, performed at intermediate
energies to increase the mean free path of the proton inside the nucleus\,
can provide quite clean spectroscopic information on exotic nuclei. The T
ransfer to the Continuum framework\, originally developed for the case of
two-body projectiles [1]\, has been recently extended to describe (p\,pN)
reactions induced by Borromean (core+N+N) nuclei [2]. In this method\, the
relative energy distribution of the residual unbound two-body subsystem\,
which is assumed to retain information on the structure of the initial th
ree-body projectile\, is computed by evaluating the transition amplitude f
or different neutron-core final states in the continuum. These transition
amplitudes depend on the overlaps between the original three-body ground-s
tate wave function and the two-body continuum states populated in the reac
tion\, thus ensuring a consistent description of the incident and final nu
clei. \n\nWe applied the method to the 11Li(p\,pn)10Li reaction at 280 MeV
/u\, obtaining a very good agreement with GSI data [3]. In order to descri
be the 14Be(p\,pn)13Be reaction\, in which gamma coincidences from the dec
ay of 12Be provide additional information [4]\, the effect of core excitat
ions has been incorporated in the structure description. Preliminary resul
ts show the sensitivity of the cross sections to the structure input. Othe
r cases of interest include 8He(p\,pn)7He\, 17Ne(p\,2p)16F\, or 22C(p\,pn)
21C. \n\n[1] A. M. Moro\, PRC 92 (2015) 044605.\n[2] M. Gómez-Ramos\, J
. Casal\, and A. M. Moro\, PLB 772 (2017) 115.\n[3] Y. Aksyutina et al.\,
PLB 666 (2008) 430.\n[4] Y. Kondo et al.\, PLB 690 (2010) 245.\n\nhttps:
//indico2.riken.jp/event/2536/contributions/11030/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11030/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Interplay of charge-clustering and weak binding in direct reaction
s of 8Li
DTSTART:20180606T022100Z
DTEND:20180606T023900Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11019@indico2.riken.jp
DESCRIPTION:Speakers: Edward C. Simpson (Australian National University)\,
Elizabeth Williams (Australian National University)\, Chandrima Sengupta
(Australian National University)\, David J. Hinde (Australian National Uni
versity)\, Mahananda Dasgupta (Australian National University)\, Cedric Si
menel (Australian National University)\, Ian P. Carter (Australian Nationa
l University)\, Lauren T. Bezzina (Australian National University)\, Benja
min M.A. Swinton-Bland (Australian National University)\, Kaitlin J. Cook
(Australian National University)\, Kirsten Vo-Phuoc (Australian National U
niversity)\, Sunil Kalkal (Thapar University)\n\nA critical problem affect
ing studies and uses of light weakly-bound nuclei is the suppression of ab
ove-barrier complete fusion (e.g. [1]). The cause of suppression is uncert
ain\, particularly for exotic neutron-rich radioactive nuclei. The suppres
sion is thought to be related to their low thresholds for breakup into cha
rged clusters. The observation of fusion suppression in the neutron-rich r
adioactive nucleus 8Li [2] is therefore puzzling: breakup into 7Li+n has t
he lowest breakup threshold\, and cannot contribute to fusion suppression
as 7Li retains all the projectile charge\, while breakup into charged part
icles has a much higher threshold. Studies of breakup in reactions of 6\,7
Li and 9Be show that transfer into unbound states of neighbouring nuclei (
"transfer triggered breakup") forms a significant portion of the total bre
akup yield [3\,4]\, but no such study has yet been performed for neutron-r
ich radioactive weakly bound nuclei. \n\nHere we present the full characte
ristics of 8Li direct reactions in collisions with 209Bi\, which were inve
stigated at energies slightly above the coulomb barrier using the SOLEROO
radioactive beam capability at the Australian National University. Through
measuring coincidences and correlations between charged fragments\, we sh
ow for the first time the diversity of breakup modes for the neutron rich
radioactive isotope 8Li\, and that the breakup occurs too slowly (> few 10
^-21 s) to result in suppression via the commonly assumed mechanisms. \n\n
Our work conclusively demonstrates that the almost universally assumed mec
hanism for complete fusion suppression – fast charged-cluster breakup
– is not correct in reactions of 8Li\, and provides evidence that it is
clustering in the ground-state that is the crucial factor in fusion suppre
ssion. This work identifies a new mechanism for fusion suppression that mu
st be investigated\, and motivates further studies of fusion suppression i
n neutron rich nuclei.\n\n\n[1] M. Dasgupta\, D. J. Hinde\, R. D. Butt\, R
. M. Anjos\, A. Berriman\, N. Carlin\, P. R. S. Gomes\, C. R. Morton\, J.
O. Newton\, A. Szanto de Toledo\, and K. Hagino\, Physical Review Letters
82\, 1395 (1999).\n[2] E. F. Aguilera\, E. Martinez-Quiroz\, P. Rosales\,
J. J. Kolata\, P. A. Deyoung\, G. F. Peaslee\, P. Mears\, C. Guess\, F. D.
Becchetti\, J. H. Lupton\, and Y. Chen\, Physical Review C 80\, 044605 (2
009).\n[3] D. H. Luong\, M. Dasgupta\, D. J. Hinde\, R. du Rietz\, R. Rafi
ei\, C. J. Lin\, M. Evers\, and A. Diaz-Torres\, Physical Review C 88\, 34
609 (2013).\n[4] R. Rafiei\, R. du Rietz\, D. H. Luong\, D. J. Hinde\, M.
Dasgupta\, M. Evers\, and A. Diaz-torres\, Physical Review C 81\, 024601 (
2010).\n\nhttps://indico2.riken.jp/event/2536/contributions/11019/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11019/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Prize and Closing
DTSTART:20180608T064500Z
DTEND:20180608T071500Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11420@indico2.riken.jp
DESCRIPTION:Speakers: Takashi Nakamura (Tokyo Institute of Technology)\, Y
osuke KONDO\n\nhttps://indico2.riken.jp/event/2536/contributions/11420/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11420/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pygmy dipole states in deformed nuclei
DTSTART:20180607T071800Z
DTEND:20180607T073600Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11100@indico2.riken.jp
DESCRIPTION:Speakers: Edoardo G. Lanza (INFN - Sezione di Catania)\n\nIn t
he last years special attention has been devoted to the study of the dipol
e strength at low excitation energy in neutron-rich nuclei\, the so called
Pygmy Dipole Resonance (PDR). This mode carries few per cent of the isove
ctor EWSR\, and it is present in many stable and unstable isotopes with a
consistent neutron excess.\nIt is possible to study these low lying dipole
states by using an isoscalar probe in addition to the conventional isovec
tor one due to the fact that their transition densities show a strong mixi
ng of their isoscalar and isovector components. Indeed\, the combined use
of real and virtual phonons and experiments employing (α\,α γ) as well
as (17O\, 17O’ γ)\, for the investigation of the PDR states has unveile
d a new feature of these states. Namely\, the peak of these low-lying dipo
le states can be separated in two parts: the part lying at low energy is e
xcited by both the isoscalar and isovector interactions while the high ene
rgy part is populated only by the electromagnetic probes.\nRecently\, the
interest has moved on deformed nuclei. In these nuclei the Giant Dipole Re
sonance (GDR) peak is separated in two parts. Each of them corresponds\, i
n the hydro-dynamical model\, to an out-of-phase oscillation of neutron ag
ainst pro- tons along the symmetry and its perpendicular axes. These modes
are characterized by two quantum number K = 0− and K = 1− that give r
ise to two separated bands in the laboratory frame. If it is true that the
pygmy states are generated by the out-of-phase oscillation of the neutron
excess against a proton plus neutron core\, then the same mechanism produ
cing the splitting of the GDR should be valid also for the low lying dipol
e states. Therefore one should expect as well to observe a separation of t
he pygmy dipole peak in two bumps.\nCalculations done within a simple macr
oscopic model show that the transition densities of the low lying dipole s
tates have the same typical behaviour of the non- deformed nuclei namely a
strong isoscalar-isovector mixing at the nuclear surface. These results a
re corroborated by some microscopic calculations performed by using a rela
tivistic Hartee-Bogoliubov mean field plus a relativistic quasi-particle r
andom phase approximation.\nTherefore a suitable way to investigate the py
gmy states in deformed prolate nuclei is through the use of isoscalar prob
es. Measurement of the pygmy dipole states excitations along an isotope ch
ain with increasing deformation may enlighten and give new perspectives ab
out these novel excitation modes.\n\nhttps://indico2.riken.jp/event/2536/c
ontributions/11100/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11100/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Multinucleon transfer and double charge-exchange reactions
DTSTART:20180604T052400Z
DTEND:20180604T054200Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11099@indico2.riken.jp
DESCRIPTION:Speakers: José Antonio Lay Valera (Universidad de Sevilla)\n\
nThere is a renewed interest in single and double charge-exchange reaction
s due to its connection with the Fermi and Gamow-Teller transitions and do
uble beta decay. It has given origin to different campaigns mainly at RCNP
and RIKEN in Japan and at the LNS-INFN Catania in Italy. This last one is
focused on the connection of double charge-exchange and the neutrinoless
double-beta decay which would help to constrain the possibility of neutrin
os to be Majorana particles and eventually the measurement of the mass of
the neutrinos.\n\nAt the bombarding energies used at the LNS-INFN\, differ
ent combinations of multinucleon transfer contributes to the final double
charge cross section. These contributions are not present in the correspon
dent beta decay. However\, this fact can be of help to further constrain t
he wavefunction of the nuclei involved since they can also be studied in t
erms of one and two nucleon transfer cross section which will be measured
in the same experiment.\n\nIn this contribution\, we will evaluate the tot
al cross section for the double charge-exchange reactions 116Cd(20Ne\,20O)
116Sn and 40Ca(18Ne\,18O)40Ar at 15 MeV/nucleon in order to compare with
the preliminary experimental data. The double charge exchange will be eval
uated as two sequential single charge-exchange processes in 2nd order DWBA
. Multinucleon transfer will be added coherently. We will evaluate the pos
sibility of obtaining a full description of the absolute cross section and
non-orthogonality terms involved in the 3rd and 4th order DWBA calculatio
ns corresponding to the multinucleon transfer processes.\n\nhttps://indic
o2.riken.jp/event/2536/contributions/11099/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11099/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shape coexistence of neutron-rich $^{69\,71\,73}$Co isotopes
DTSTART:20180604T020300Z
DTEND:20180604T022100Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11076@indico2.riken.jp
DESCRIPTION:Speakers: Frédéric Nowacki (Institut de Recherches Subatomiq
ues (IN2P3-ULP) F 67037 Strasbourg Cedex 2\, France)\, Taras Lokotko (The
University of Hong Kong)\, Sylvain LEBLOND (Laboratoire de Physique Corpus
culaire de Caen (LPC Caen))\, Jenny Lee (The University of Hong Kong)\, Al
exandre Obertelli (TU Darmstadt)\, Alfredo Poves (Departmento de Fiica Teo
rica and IFT-UAM/CSIC\, Universidad Aut ́onoma de Madrid)\, Pieter Doorne
nbal (RIKEN)\n\nObservation of high 2$^{+}$ excitation energy in $^{68}$Ni
(Z = 28\, N = 40) had drawn a clear signature of double magic character i
n this nucleus [1]. And while $^{68}$Ni can be described as spherical isot
ope\, 2$^{+}$ excitation energy of $^{66}$Fe drops significantly [2]\, ind
icating deformed shape of $^{66}$Fe. $^{67}$Co isotope is in between $^{68
}$Ni and $^{66}$Fe nuclei and found to share coexistence of both spherical
and deformed structures in low-lying excited states [3]. This effect can
be described as superposition of a proton f$_{7/2}$ hole coupled to neighb
ouring spherical even-even nickel isotope and a prolate proton-intruder st
ate coupled to the $^{66}$Fe isotope [4]. Discovery of shape coexistence i
n $^{67}$Co rose an interesting question about further shape evolution in
Co nuclei\, namely $^{69\,71\,73}$Co and shell transformation from N = 40
to N = 50. \n In-beam gamma experiment was performed at Radioactive Iso
tope Beam Factory\, RIKEN Nishina centre\, Japan. Secondary beam of $^{70\
,72\,74}$Ni and $^{72}$Co isotopes at energy of 260 MeV/µ bombarded liqui
d hydrogen target (MINOS) to produce $^{69\,71\,73}$Co nuclei via (p\, 2p)
and (p\, pn) reactions. DALI2 NaI(Tl) detector array was used to measure
$\\gamma$-rays. Energy levels were studied using $\\gamma$-$\\gamma$ coinc
idence technique. Systematics of excited states of cobalt isotopes was com
pared with Lenzi-Nowacki-Poves-Sieja (LNPS) model [5] of nuclear interacti
on using fpgd model space. Experimental results of $^{69\,71}$Co spectrums
show that isotopes share shape coexistence\, as spherical structure coexi
sts with deformed band. In case of $^{73}$Co nucleus\, due to the lack of
statistics only spherical band is confirmed. \n In this talk the evolut
ion of shell structure in $^{69\,71\,73}$Co isotopes will be discussed tog
ether with physics behind the shape coexistence in neutron-rich Co nuclei.
\n \nReferences.\n1. R. Broda\, B. Fornal\, W. Krolas\, and T. Pawkat\,
Phys. Rev. Lett. 74\, 868 (1995)\;\n2. S. Lunardi\, S. M. Lenzi\, F. Dell
a Vedova\, Phys. Rev. C\, 76\, 034303 (2007)\;\n3. F. Recchia et al.\, Phy
s. Rev. C 85\, 064305 (2012)\;\n4. D. Pauwels et al.\, Phys. Rev. C 78\, 0
41307(R) 2008\;\n5. S. M. Lenzi\, et. al.\, Phys. Rev. C 82\, 054301 (2010
).\n\nhttps://indico2.riken.jp/event/2536/contributions/11076/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11076/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Resonance scattering with exotic beams - past\, present and future
DTSTART:20180607T050000Z
DTEND:20180607T051800Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11040@indico2.riken.jp
DESCRIPTION:Speakers: Grigory Rogachev (Texas A&\;amp\;M University)\n\
nExperiments employing resonance scattering reactions with radioactive bea
ms have been performed since mid-90s\, and originally they were primarily\
ntargeting structure of light weakly bound or unbound proton rich nuclei [
1]. Strong scientific potential of resonance reactions as an experimental
tool\nhas been immediately recognized for physics of exotic proton rich nu
clei. Unlike for stable nuclei\, for weakly bound or unbound nuclei resona
nce reactions provide access to states with small or zero excitation energ
y. Typically low level density at small excitation energies allow for deta
iled and often unambiguous analysis. These features\, combined with applic
ation of thick target inverse kinematics approach that allowed high effici
ency and excellent energy resolution with relatively simple experimental s
etup\, made resonance scattering experiments popular. Many successful expe
riments have been performed\, including those in which ground states of ex
otic nuclei were observed for the first time (10N is the latest example [2
]). More recently resonance reactions have been applied to study clusterin
g phenomena in neutron and proton rich nuclei [3\, 4] and also the structu
re of neutron rich nuclei through isobaric analog states [5]. Significant
improvements of experimental techniques\, such as active target systems\,
open up new exciting opportunities. The goal of this talk is to provide a
brief highlight of the most interesting past results\, overview the curren
t directions and discuss the outlook and future perspectives.\n\nReference
s\n[1] L. Axelsson\, et al.\, Phys. Rev. C\, 54\, R1511 (1996).\n[2] J. Ho
oker\, et al.\, Phys. Lett. B\, 769\, 62 (2017).\n[3] C. Fu\, et al.\, Phy
s. Rev. C\, 77\, 064314 (2008).\n[4] D. Suzuki\, et al.\, Phys. Rev. C\, 8
7\, 054301 (2013).\n[5] E. Uberseder\, et al.\, Phys. Lett. B\, 754\, 323
(2016).\n\nhttps://indico2.riken.jp/event/2536/contributions/11040/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11040/
END:VEVENT
BEGIN:VEVENT
SUMMARY:LINKING NUCLEAR REACTIONS AND NUCLEAR STRUCTURE ON THE WAY TO THE
DRIP LINES
DTSTART:20180605T050000Z
DTEND:20180605T051800Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11036@indico2.riken.jp
DESCRIPTION:Speakers: Willem Dickhoff (Department of Physics\, Washington
University in St. Louis)\n\nThe dispersive optical model (DOM)\, originall
y conceived by Claude \nMahaux [1]\, provides a unified description of bot
h elastic nucleon scattering and structure information related to single-p
article properties below the Fermi energy [2]. Extensions of this framewor
k have introduced a fully non-local implementation for 40-Ca [3\,4]. For t
he first time properties below the Fermi energy like the charge density an
d the presence of high-momentum nucleons can be included in the DOM descri
ption while elastic cross section data can be represented as accurately as
in the local DOM implementation. Application of the non-local DOM to 48-C
a incorporates the effect of the 8 additional neutrons and allows for an e
xcellent description of elastic scattering data of both protons and neutro
ns [5]. The corresponding neutron distribution constrained by all availabl
e data generates a prediction for the neutron skin of 0.249 +/- 0.023 fm f
or this nucleus [5] which is larger than most mean-field and available ab
initio results.\n\nWe report on the most recent developments including a n
on-local DOM analysis for 208-Pb\, an extension to heavier Ca isotopes\, a
n analysis of the energy density in comparison with ab initio nuclear matt
er calculations\, applications to (d\,p) and (p\,d) transfer reactions wit
h DOM ingredients\, and a reanalysis of (e\,e'p) data to determine if expe
rimental data can constrain the magnitude of absolute spectroscopic factor
s.\n\n[1] C.Mahaux and R.Sartor\, Adv.Nucl. Phys. 20\, 1 (1991).\n[2] W.H.
Dickhoff\, R.J.Charity\, and M.H.Mahzoon\, J. Phys. G: Nucl. Part. Phys. 4
4\, 033001 (2017).\n[3] M.H.Mahzoon et al.\, Phys. Rev. Lett. 112\, 162503
(2014).\n[4] H.Dussan et al.\, Phys. Rev. C 90\, 061603(R) (2014).\n[5] M
.H.Mahzoon et al.\, Phys. Rev. Lett. 119\, 222503 (2017).\n\nhttps://indic
o2.riken.jp/event/2536/contributions/11036/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11036/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Reaction mechanisms of 17F+58Ni at energies around the Coulomb bar
rier
DTSTART:20180607T081200Z
DTEND:20180607T083000Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11061@indico2.riken.jp
DESCRIPTION:Speakers: Lei Yang (Center for nulcear study\, the University
of Tokyo)\n\nWith the radioactive ion beam 17F provided by CRIB (Center fo
r Nuclear Study Radioactive Ion Beam separator)\, the reactions on the pro
ton-shell closed 58Ni target were measured at four energies around the Cou
lomb barrier: 46.0\, 49.8\, 57.9 and 65.1 MeV. A specially designed detect
or array\, which consists of ionization chambers and silicon detectors\, w
as used to identify the heavy and light reaction products simultaneously.
The angular distributions of the quasi-elastic scattering and inclusive br
eakup were obtained. The quasi-elastic data were analyzed with the framewo
rk of the optical model to deduce the total reaction cross section. The br
eakup angular distribution can be reproduced reasonably by the continuum-d
iscretized coupled-channels (CDCC) and IAV (Ichimura\, Austern\, Vincent)
model calculations\, hence the cross sections of breakup reactions can be
derived. Meanwhile\, the fusion cross section can be determined by measuri
ng the fusion-evaporation proton and alpha. The resulting fusion excitatio
n function shows an enhancement at energies below the Coulomb barrier\, an
d some suppression above the barrier.\n\nhttps://indico2.riken.jp/event/25
36/contributions/11061/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11061/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Robustness of the N=34 shell closure: First spectroscopy of 52Ar
DTSTART:20180605T025400Z
DTEND:20180605T031200Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11063@indico2.riken.jp
DESCRIPTION:Speakers: Hidetada Baba (RIKEN)\, Alexandre Obertelli (TU Darm
stadt)\, Hongna Liu (CEA\, Saclay)\, Pieter Doornenbal (RIKEN Nishina Cent
er)\, Denis Calvet (CEA Saclay)\, Frank Browne (RIKEN Nishina Center)\, Ye
lei Sun (CEA Saclay)\n\nIt is now well known that the magic numbers are no
t universal across the nuclear landscape and that new shell closures may e
merge in nuclei far from stability. In particular\, a new subshell closure
at N=34 has been reported in 54Ca. While the systematics of the E(2+) of
the Ti isotopes does not show any evidence for the existence of the N=34 s
ubshell closure\, the significant 2+ excitation energy in 54Ca was a sign
of its doubly magic character. For 52Ar\, no spectroscopic information has
been measured\, however\, its E(2+) was predicted to be the highest among
Ar isotopes with N > 20\, suggesting a robust N=34 shell gap. The spectro
scopy of 52Ar thus offers a unique chance to explore the robustness of the
N = 34 subshell closure and pin down the mechanism at the origin of its e
mergence. \n\nThe measurement of 52Ar was performed at RIBF at RIKEN using
the spectrometers of BigRIPS and SAMURAI. The low-lying states of 52Ar we
re populated via 53K(p\, 2p) and 54Ca(p\, 3p) reactions at ~240 MeV/u. The
selectivity of the (p\, 2p) and (p\, 3p) channels is used to build the le
vel scheme of 52Ar. The challenge posed by the low secondary beam intensit
y was tackled by the combination the MINOS device with a 150-mm thick liqu
id hydrogen target and the recent upgraded high efficiency DALI2+ gamma de
tector array. In the presentation\, we will report on the first in-beam ga
mma spectroscopy of low-lying states of 52Ar\, and discuss the robustness
of the N=34 shell closure in light of shell model and ab initio calculatio
ns.\n\nhttps://indico2.riken.jp/event/2536/contributions/11063/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11063/
END:VEVENT
BEGIN:VEVENT
SUMMARY:In-beam gamma-ray spectroscopy of 51K and 53K
DTSTART:20180608T023900Z
DTEND:20180608T025700Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11041@indico2.riken.jp
DESCRIPTION:Speakers: Yelei Sun (CEA Saclay)\n\nOne of the major focus of
modern nuclear physics is to explore which part of the nuclear interaction
gives rise to significant shell modifications. Recently\, the evolution o
f the 2s1/2+ and 1d3/2+ single-particle states in odd-A K isotopes attract
particular interests. The energy gap between these two states decrease co
ntinuously when neutrons fill f7/2 orbit. Inversion of the ordering of the
2s1/2 and 1d3/2 orbits has been observed in 47K (N=28) and 49K(N=30). As
the neutrons continue filling the orbits beyond the N = 28 shell\, reinve
rsion was observed for the first time in 51K using laser spectroscopy. Suc
h reinversion is consistent with the shell model calculations using differ
ent effective interactions and was revealed to be mainly driven by the cen
tral term of the monopole interaction. However\, different interactions pr
edict very different energy gaps between 2s1/2 and 1d3/2 in 51K. In additi
on\, the shell model calculation and the recently available ab initio calc
ulation also predict the reversion in 53K but also with very different ene
rgy gaps. The experimental spectroscopy of the excited states in 51K and 5
3K are thus crucial to benchmark the shell model and ab initio calculation
s and improve our understanding on the shell evolution mechanisms.\n\nThe
in-beam gamma-ray spectroscopy measurement of 51K and 53K was carried out
at RIBF at RIKEN\, as part of the third campaign of the SEASTAR program. T
he low-lying states of 51K and 53K were populated via 52Ca(p\, 2p) and 54C
a(p\, 2p)\, respectively. In the presentation\, I will report on the energ
y level scheme of 51\,53K\, exclusive cross sections and the individual pa
rallel momentum distributions.\n\nhttps://indico2.riken.jp/event/2536/cont
ributions/11041/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11041/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Investigating neutron-proton pairing in sd-shell nuclei via (p\,3H
e) and (3He\,p) transfer reactions
DTSTART:20180604T061500Z
DTEND:20180604T063300Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11048@indico2.riken.jp
DESCRIPTION:Speakers: Jenny Lee (The University of Hong Kong)\n\nPairing c
orrelations\, influencing almost every feature of ground and low-lying sta
tes in nuclei\, lie at the heart of nuclear physics. Understanding the mec
hanism of neutron-proton (np) pairing in N=Z nuclei has been a long-sought
goal in nuclear structure since the early sixties. Despite large efforts
in both theoretical and experimental studies\, the fundamental nature and
the interplay between T=0 and T=1 pairs are still the subject of debate. C
ross section measurement of np-pair transfer is considered as a sensitive
probe for the insight into T=0 and T=1 np pairing collectivity and its mec
hanism [1-3]. \n\nWe therefore carried out systematic np-transfer measurem
ents spanning N=Z sd-shell nuclei using (p\,3He) and (3He\,p) reactions at
RCNP Osaka University. In particular\, we study the cross-section ratio o
f the lowest 0+ and 1+ states as an observable to quantify the interplay b
etween T=0 (isoscalar) and T=1 (isovector) pairing strengths. The experime
ntal results are compared to second-order distorted-wave Born approximatio
n calculations with proton-neutron amplitudes obtained in the shell-model
formalism using the universal sd-shell interaction B. Our results suggest
underestimation of the nonneglible isoscalar pairing strength in the shell
-model descriptions at the expense of the isovector channel. In this talk\
, we will present this work [4].\n\nReferences:\n[1] R. A. Broglia\, O. Ha
nsen and C. Riedel\, Adv. Nucl. Phys. Vol 6\, 287 (1973).\n[2] D.R. Bes et
al.\, Phys. Rep. Vol 34C\, 1 (1977).\n[3] P. Van Isacker et al.\, Phys. R
ev. Lett. 94\, 162502 (2005).\n[4] Y. Ayyad\, J. Lee et al.\, Phys. Rev. C
96\, 021303(R) (2017).\n\nhttps://indico2.riken.jp/event/2536/contributio
ns/11048/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11048/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of breakup channels for the 6He+64Zn reaction at energies ar
ound the Coulomb barrier.
DTSTART:20180607T075400Z
DTEND:20180607T081200Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11091@indico2.riken.jp
DESCRIPTION:Speakers: Juan Pablo Fernández-García (University of Seville
)\n\nReactions induced by neutron halo nuclei have been intensively studie
d in the last years. The neutron halo structure can affect the dynamic of
reactions at energies around the Coulomb barrier producing a significant r
eduction of the elastic scattering cross section with respect to the Ruthe
rford prediction. This effect can be associated with couplings to breakup
channels\, since the continuum of such nuclei is close to the ground state
. The breakup channel can be split into two parts\; the elastic breakup an
d non-elastic breakup. \n\nThe halo nucleus 6He is composed by an alpha co
re and two weakly bound neutron (S=0.97 MeV). These two neutrons have a la
rge probability to be far away from the alpha core\, producing the so-call
ed nuclear halo.\nNew experimental elastic cross sections for the reaction
6He+64Zn at energies around the Coulomb barrier have been measured and c
ompared with CRC and CDCC calculations. CDCC calculations are based on the
elastic breakup of the projectile\, while the CRC calculations consider t
he transfer of one/two-neutron to the bound and unbound states of the targ
et\, which is part of the non-elastic breakup. To compute the total non-el
astic breakup\, the formalism reported in [Phys. Rev. C 95\, 044605 (2017)
] has been performed. The results show the angular and energy distribution
s of the breakup fragment coming from 6He+64Zn reaction are well reproduce
d by the one/two-neutron transfer mechanism\, indicating the importance of
the non-elastic breakup.\n\nhttps://indico2.riken.jp/event/2536/contribut
ions/11091/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11091/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Evidence for Z=6 subshell closure in neutron-rich carbon isotopes
DTSTART:20180605T020000Z
DTEND:20180605T021800Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11096@indico2.riken.jp
DESCRIPTION:Speakers: Hooi Jin Ong (RCNP\, Osaka University)\, T.D. et al
. Morris (ORNL)\, D.T. Tran (RCNP\, Osaka University)\, G. Hagen (ORNL)\n\
nThe nuclear magic numbers\, as we know in stable nuclei\, consist of two
different series of numbers. The first series -- 2\, 8\, 20 -- is attribut
ed to the harmonic oscillator potential\, while the second one -- 28\, 50\
, 82\, and 126 -- is due to the spin-orbit (SO) interactions. The spin-orb
it interactions are known to be significant and responsible for the large
(spin-orbit) splitting of the single-particle states in heavy nuclei. Thes
e splittings\, however\, are expected to diminish in light nuclei due to l
ow orbital angular momenta. This general expectation is supported by the f
act that there is an apparent lack of fingerprints for a `magic number' (s
ubshell closure) at 6 or 14 [1]\, which might have arisen from the widenin
g 1p1/2-1p3/2 and 1d3/2-1d5/2 gaps\, respectively\, in the stable nuclei.
A possible subshell closure at N=6 has been suggested both theoretically [
2] and experimentally [3] in the very neutron-rich 8He isotope. For Z=6 an
d 14\, possible subshell closures have been suggested [4] in the semi-magi
c 14C and 34Si.\n\nIn this talk\, we will present experimental evidence fo
r a prevalent subshell closure at proton number Z=6 in the neutron-rich ca
rbon isotopes. We investigated (i) the point proton density distribution r
adii\, combining our recent data for Be\, B and C isotopes measured at RCN
P\, Osaka University and GSI\, Darmstadt\, with the available data from Re
f. [5]\; (ii) the atomic masses [6]\; and (iii) the electromagnetic transi
tion strengths [7] for a wide range of isotopes. Our systematic analysis r
evealed marked regularities which support a prominent proton `magic number
' Z=6 in 13-20C.\n\n[1] M. G. Mayer\, Nobel Lectures in Physics\, 20 - 37
(1963).\n[2] T. Otsuka et al.\, Phys. Rev. Lett. 87\, 082502 (2001).\n[3]
F. Skaza et al.\, Phys. Rev. C 73\, 044301 (2006).\n[4] I. Angeli and K. P
. Marinova\, J. Phys. G: Nucl. Part. Phys. 42\, 055108 (2015).\n[5] I. Ang
eli and K. P. Marinova\, At. Data Nucl. Data Tables 99\, 69 -95 (2013).\n[
6] M. Wang et al.\, Chinese Phys. C 41\, 030003 (2017).\n[7] B. Pritychenk
o et al.\, At. Data Nucl. Data Tables 107\, 1 - 139 (2016).\n\nhttps://ind
ico2.riken.jp/event/2536/contributions/11096/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11096/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Microscopic optical potential for proton elastic scattering off li
ght exotic nuclei
DTSTART:20180605T051800Z
DTEND:20180605T053600Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11028@indico2.riken.jp
DESCRIPTION:Speakers: Matteo Vorabbi (TRIUMF Canada's particle accelerator
centre)\, Michael Gennari (TRIUMF)\, Navratil Petr (TRIUMF)\n\nA microsco
pic optical potential for intermediate energies is derived using ab initio
translationally invariant nonlocal one-body nuclear densities computed wi
thin the no-core shell model approach utilizing two- and three-nucleon chi
ral interactions. The optical potential is obtained at first-order within
the spectator expansion of the non-relativistic multiple scattering theory
by adopting the impulse approximation. The nuclear density and the nucleo
n-nucleon t matrix are the two basic ingredients underlying the computatio
n of the optical potential and are both obtained using the same chiral int
eraction\, that represents the only input of our calculations. The ground
state local and nonlocal densities of several unstable nuclei are calculat
ed and applied to optical potential construction. The differential cross s
ections and the analyzing powers for the elastic proton scattering off the
se nuclei are then calculated for different values of the incident proton
energy. The model is first tested on 4He\, 12C\, and 16O\, and then is use
d to compute and compare the results for the scattering observables with t
he existing experimental data for 6He and 8He halo nuclei. Finally\, predi
ctions for the same observables will be also presented for proton elastic
scattering off other unstable nuclei like 10Be\, 10C\, 14C\, and 14O.\n\nh
ttps://indico2.riken.jp/event/2536/contributions/11028/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11028/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pairing collectivity in the ground state of Borromean nuclei and u
nbound 2n-systems: 22C and 26O
DTSTART:20180607T005400Z
DTEND:20180607T011200Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11085@indico2.riken.jp
DESCRIPTION:Speakers: JAGJIT SINGH (Nuclear Reaction Data Center\, Faculty
of Science\, Hokkaido University\, Sapporo 060-0810\, Japan)\, Lorenzo Fo
rtunato (Dipartimento di Fisica e Astronomia "G.Galilei"\, and INFN-Sezion
e di Padova\, via Marzolo 8\, I-35131 Padova\, Italy)\, Wataru Horiuchi (D
epartment of Physics\, Hokkaido University\, Sapporo 060-0810\, Japan)\, A
ndrea Vitturi (Dipartimento di Fisica e Astronomia "G.Galilei"\, and INFN-
Sezione di Padova\, via Marzolo 8\, I-35131 Padova\, Italy)\n\nIn recent y
ears\, there has been rapidly increasing interest in the study of the Borr
omean nuclei sitting right on the top of neutron driplines and two-neutron
decays of unbound systems beyond the neutron dripline. These systems dema
nds a three-body description with proper treatment of continuum\, the conv
entional shell-model assumptions being insufficient. Very recently a high\
nprecision measurement of interaction cross-section for 22C was made on a
carbon target at 235 MeV/nucleon [1] and also the unbound nucleus 26O has
been investigated\, using invariant-mass spectroscopy [2] at RIKEN Radioac
tive Isotope Beam Factory. These high precision measurements\, are the mot
ivation for selecting these systems for the present study. We have studied
the pairing\ncollectivity in the ground state of Borromean nuclei 22C and
in the 2n- unbound system 26O. For this study we have used our recently i
mplemented 3 - body (core+n+n) structure model for ground and continuum st
ates of the Borromean nuclei [3\, 4].\n\nWe will present the ground state
properties of 22C and 26O systems and transitions to the continuum that mi
ght be of help in disentangling the still poorly known low-energy resonanc
es and predicting new resonances of these nuclei. We compare our findings
with the more recent experimental works and the scarce theoretical work th
at has been done in the recent past on these\nsystems.\n\nThe neutron sing
le-particle unbound spdf- continuum states of the 21C and 25O system are c
alculated in a simple shell model picture for different continuum energy c
ut-off's of 5\, 10 and 15 MeV by using a Dirac delta normalization and are
checked with a more refined phase-shift analysis. The sensitivity of the
(core+n) potential has been explored for the emergence of different domina
nt configurations in the ground state of 22C and 26O. After fixing converg
ence with the continuum energy cuts and bining size\, a reasonable energy
cut of 5 MeV and bin size of 0.1 MeV is used for present study. These (cor
e+n) continuum wavefunctions are used to construct the two-particle 22C an
d 26O states by proper angular momentum couplings and taking contribution\
nfrom different configurations. We have explored the role of different pai
ring interactions such as density independent (DI) contact-delta pairing i
nteraction and density dependent (DD) contact-delta pairing interaction in
the structure of these systems. We have shown how the ground state\ndispl
ays a collective nature\, taking contribution from many different oscillat
ing continuum states that coherently sum up to give an exponentially decay
ing bound wavefunction in 22C and an oscillating unbound wavefunction in c
ase of 26O.\n[1] Y. Togano et al.\, Phys. Lett. B761\, 412-418 (2016).\n[2
] Y. Kondo et al.\, Phys. Rev. Lett. 116\, 102503 (2016).\n[3] L.Fortunato
\, R.Chatterjee\, Jagjit Singh and A.Vitturi\, Phys. Rev. 90\, 064301 (201
4).\n[4] Jagjit Singh\, L.Fortunato\, A.Vitturi and R.Chatterjee\, Eur. Ph
ys. J. A 52 209 (2016).\n\nhttps://indico2.riken.jp/event/2536/contributio
ns/11085/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11085/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of Charge-Exchange Reactions for constraining Stellar Elect
ron-Capture Rates
DTSTART:20180607T023600Z
DTEND:20180607T025400Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11071@indico2.riken.jp
DESCRIPTION:Speakers: . for the E15112 collaboration (National Superconduc
ting Cyclotron Laboratory\, Michigan State University\, East Lansing\, US
A)\, J. C. Zamora (National Superconducting Cyclotron Laboratory\, Michiga
n State University\, East Lansing\, USA)\, R.G.T. Zegers (National Superc
onducting Cyclotron Laboratory\, Michigan State University\, East Lansing\
, USA)\n\nCharge-exchange (CE) reactions at intermediary energies serve as
a direct method for the extraction of the Gamow-Teller (GT) transition s
trengths\, which are of importance for the estimation of weak-reaction r
ates for a variety of astrophysical phenomena such as core-collapse supe
rnovae (CCSN) and the crustal heating of neutron \nstars. In particular\,
CE reactions in the $\\beta^+$ direction\, like $(t\,{}^{3}\\text{He})$ an
d $(d\,{}^{2}\\text{He})$\, are essential to determine the electron-captu
re (EC) rates that play a significant role in the above-mentioned scen
arios.\\\\\nRecently\, a ${}^{88}\\text{Sr}(t\,{}^{3}\\text{He}+\\gamma){}
^{88}\\text{Rb}$ experiment was performed at NSCL using the S800 spectro
meter in coincidence with the gamma-ray detector array GRETINA. Experime
ntal results provide a constrain of the EC rates on neutron-rich nuclei\,
around the $N=50$ line\, which \nare of importance for understanding the
late stages of CCSN.\\\\\nIn the future\, $(d\,{}^{2}\\text{He})$ experime
nts in inverse kinematics will open up the opportunity to investigate CE
reactions of far-from-stability nuclei. The AT-TPC\, a detector based on t
ime \nprojection chamber\, provides a unique technique for achieving such
experiments. Simulation results show a very good reconstruction of the $(
d\,{}^{2}\\text{He})$ kinematics and \nalso indicate that this technique m
ight be feasible for upcoming experiments.\\\\\nResults of the data analys
is and perspectives for $(d\,{}^{2}\\text{He})$ experiments will be discu
ssed.\n\nhttps://indico2.riken.jp/event/2536/contributions/11071/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11071/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Study of the A=9 T=3/2 isobaric quartet through R-Matrix analysis
of resonance scattering of analogue states.
DTSTART:20180607T053600Z
DTEND:20180607T055400Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11087@indico2.riken.jp
DESCRIPTION:Speakers: Sergio Almaraz-Calderon (Florida State University -
Department of Physics)\, Vladilen Goldberg (Texas A&M University - Cyclot
ron Institute)\, T. Upadhyayula (Texas A&M University - Department of Phys
ics and Astronomy)\, S. Ahn (Texas A&M University - Cyclotron Institute)\,
Ingo Wiedenhover (Florida State University - Department of Physics)\, Ant
hony Kuchera (Florida State University -Department of Physics\; Davidson)\
, L. T. Baby (Florida State University - Department of Physics)\, Wanpeng
Tan (University of Notre Dame - Department of Physics)\, H. Jayatissa (Tex
as A&M University - Department of Physics and Astronomy)\, Y. Koshchiy (Te
xas A&M University - Cyclotron Institute)\, Grigory Rogachev (Texas A&M Un
iversity - Physics and Astronomy)\, J. Hooker (Texas A&M University - Depa
rtment of Physics and Astronomy)\, Curtis Hunt (Texas A&\;M University
- Physics and Astronomy)\, (University of Notre Dame - Department of Phys
ics)\n\nStudies of the structure of neutron rich nuclei are important for
exploring shell evolution and the development of theoretical models. While
transfer reactions are currently the primary method of studying neutron r
ich nuclei it is suggested that study of isobaric analogue states through
resonance proton scattering could be used as well [1]. We’ve performed a
benchmark study of the A=9\, T=3/2 isobaric quartet\, populating T=3/2 st
ates in 9Be using 8Li+p resonance scattering. R-matrix analysis combined w
ith the optical model has been applied for analysis of the 8Li+p excitatio
n function to extract the parameters of the isobaric analog states in 9Be.
We compare the results of this experiment to the available data on 9Be T=
3/2 states and on the other members of the A=9\, T=3/2 isobaric quartet -
9Li [2] and 9C [3]. We show that proton resonance scattering can be a usef
ul complimentary tool for spectroscopy studies of neutron rich nuclei with
radioactive beams\, provided that robust procedure can be established to
fix the parameters of the optical model potentials. The radioactive beam o
f 8Li was delivered by RESOLUT facility at the John D. Fox superconducting
linear accelerator facility at Florida State University and also by MARS
facility at the Cyclotron Institute at Texas A&M University. The 8Li+p exc
itation function was measured using modified thick target approach and als
o with active target detector - Texas Active Target (TexAT)\, as part of T
exAT's commissioning run.\n\n[1] V. Z. Goldberg\, AIP Conference Proceedin
g 455 319 (1998)\n[2] A.H. Wuosmaa\, et al.\, Phys. Rev. Lett. 94 082502 (
2005)\n[3] G. V. Rogachev et al.\, Phys. Rev. C 75 014603 (2007)\n\nhttps:
//indico2.riken.jp/event/2536/contributions/11087/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11087/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spectroscopic Factors in the Islands of Inversion à la Nilsson *
DTSTART:20180605T000000Z
DTEND:20180605T001800Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11062@indico2.riken.jp
DESCRIPTION:Speakers: Marco Salathe (Lawrence Berkeley National Laboratory
)\, Mario Cromaz (Lawrence Berkeley National Laboratory)\, Roderick Clark
(Lawrence Berkeley National Laboratory)\, Paul Fallon (Lawrence Berkeley L
aboratory)\, I-Yang Lee (Lawrence Berkeley National Laboratory)\, Chris Ca
mpbell (Lawrence Berkeley National Laboratory)\, Heather Crawford (Lawrenc
e Berkeley National Laboratory)\, Andrea Richard (Ohio University)\, Augus
to Macchiavelli (Lawrence Berkeley National Laboratory)\, Michael Jones (L
awrence Berkeley National Laboratory)\n\nGuided by the formalism developed
for studies of single-nucleon transfer reactions in deformed nuclei [1]\,
we have analyzed spectroscopic factors data in the Islands of Inversion a
t N=8 and 20\, in the rotational strong-coupling limit. \n\nBased on the
fact that intruder deformed configurations dominate the low-lying structur
e of nuclei within the Islands of Inversion\, the Nilsson formalism provid
es an intuitive and simple approach to obtain important structure informat
ion from direct reactions\, and a complementary view to shell model calcul
ations.\n\nWe will present results for 10\,11\,12Be and 32\,33Mg [2\,3]\,
showing good agreement with the experimental data\, and discuss some predi
ctions for other regions.\n\n* This work is supported by the U.S. Departme
nt of Energy\, Office of Nuclear Physics\, under contract no DE-AC02-05CH1
1231.\n\n[1] B. Elbek and P. Tjom\, Advances in Nucl. Phys. Vol 3\, 259 (1
969).\n[2] A. O. Macchiavelli\, et al. Phys. Rev. C97\, 011302 (R) (2018)
.\n[3] A. O. Macchiavelli\, et al. Phys. Rev. C96\, 054302 (2018).\n\nhtt
ps://indico2.riken.jp/event/2536/contributions/11062/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11062/
END:VEVENT
BEGIN:VEVENT
SUMMARY:In-beam gamma-ray spectroscopy near the proton drip line: 25Si and
26P
DTSTART:20180605T003600Z
DTEND:20180605T005400Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11038@indico2.riken.jp
DESCRIPTION:Speakers: Werner Richter (University of the Western Cape / iTh
emba LABS)\, Brenden Longfellow (Michigan State University / National Supe
rconducting Cyclotron Laboratory)\, Alex Brown (Michigan State University
/ National Superconducting Cyclotron Laboratory)\, Brandon Elman (Michigan
State University / National Superconducting Cyclotron Laboratory)\, Danie
l Bazin (National Superconducting Cyclotron Laboratory)\, Eric Lunderberg
(Michigan State University / National Superconducting Cyclotron Laboratory
)\, Alexandra Gade (Michigan State University / National Superconducting C
yclotron Laboratory)\, Scott Williams (National Superconducting Cyclotron
Laboratory)\, Dirk Weisshaar (National Superconducting Cyclotron Laborator
y)\, Michael Bowry (National Superconducting Cyclotron Laboratory)\, Peter
Bender (National Superconducting Cyclotron Laboratory)\n\nThe structure o
f neutron-deficient nuclei plays a vital role in nucleosynthesis via the r
p process. Near the proton drip line\, the Q values of (p\,g) reactions ar
e low and the reaction rates are dominated by single resonances and direct
capture. We present here studies of 25Si and 26P produced through one-neu
tron knockout and charge exchange at the National Superconducting Cyclotro
n Laboratory at Michigan State University. Energy levels and branching rat
ios in 25Si and 26P were measured using in-beam gamma-ray spectroscopy wit
h the high-efficiency CsI(Na) array CAESAR and the high-resolution segment
ed Ge array SeGA. The results are compared with the mirror nuclei to show
a significant Thomas-Ehrman shift in this region. Shell-model calculations
using the USDB-CDPN interaction with a downward shift of the single-parti
cle energy for the 1S1/2 proton orbital to reproduce the observed Thomas-E
hrman shift are discussed and used with the experimentally measured resona
nces to calculate the (p\,g) reaction rates.\n\nhttps://indico2.riken.jp/e
vent/2536/contributions/11038/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11038/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Coupled-channels analyses for $^{9\,11}$Li + $^{208}$Pb fusion rea
ctions with multi-neutron transfer couplings
DTSTART:20180606T014500Z
DTEND:20180606T020300Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11088@indico2.riken.jp
DESCRIPTION:Speakers: Choi Ki-Seok (Department of phyiscs\, Soongsil Univ.
)\, Kim K.S. (Korea Aerospace University)\, So W.Y. (Kangwon National Univ
ersity)\, Cheoun Myung-Ki (Department of physics\, Soongsil Univ.)\, Kouic
hi Hagino (Department of Physics\, Tohoku University)\n\nWe discuss the ro
le of two-neutron transfer processes in the fusion reaction of the $^{9\,1
1}$Li + $^{208}$Pb systems.\nWe first analyze the $^{9}$Li + $^{208}$Pb re
action by taking into account the coupling to the\n$^{7}$Li + $^{210}$Pb c
hannel. To this end\, we assume that two neutrons are directly transferre
d to a single effective channel in $^{210}$Pb and solve the coupled-channe
ls equations with \\textcolor[rgb]{0.98\,0.00\,0.00}{the} two channels. B
y adjusting the coupling strength and the effective $Q$-value\, we success
fully reproduce the experimental fusion\ncross sections for this system.
We then analyze the $^{11}$Li + $^{208}$Pb reaction in a similar manner\,
that is\, by taking into account three effective channels with\n$^{11}$Li
+ $^{208}$Pb\, $^{9}$Li + $^{210}$Pb\, and $^{7}$Li + $^{212}$Pb\npartiti
ons. In order to take into account the halo structure of the $^{11}$Li nu
cleus\,\nwe construct the potential between $^{11}$Li and $^{208}$Pb with
a double folding procedure\, while we employ a Wood-Saxon type potential w
ith the global Aky\\"uz-Winther parameters for the other channels.\nOur ca
lculation indicates that the multiple two-neutron transfer process plays a
crucial role in the $^{11}$Li + $^{208}$Pb fusion reaction at energies ar
ound the Coulomb barrier.\n\nhttps://indico2.riken.jp/event/2536/contribut
ions/11088/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11088/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Elastic scattering measurement for the 10Be+natPb reaction at abov
e the Coulomb barrier energy
DTSTART:20180606T020300Z
DTEND:20180606T022100Z
DTSTAMP:20240319T090700Z
UID:indico-contribution-11079@indico2.riken.jp
DESCRIPTION:Speakers: G.M. Yu (Institute of Modern Physics\, Chinese Acade
my of Sciences\, Lanzhou\, 730000\, China)\, Z.H. Gao (Institute of Modern
Physics\, Chinese Academy of Sciences\, Lanzhou\, 730000\, China)\, Z. Ba
i (Institute of Modern Physics\, Chinese Academy of Sciences\, Lanzhou\, 7
30000\, China)\, J. S. Wang (Institute of Modern Physics\, Chinese Academy
of Sciences\, Lanzhou\, 730000\, China)\, W.H. Ma (Institute of Modern Ph
ysics\, Chinese Academy of Sciences\, Lanzhou\, 730000\, China)\, J. B. Ma
(Institute of Modern Physics\, Chinese Academy of Sciences\, Lanzhou\, 73
0000\, China)\, X. Liu (Institute of Modern Physics\, Chinese Academy of S
ciences\, Lanzhou\, 730000\, China)\, Y.C. Yu (Institute of Modern Physics
\, Chinese Academy of Sciences\, Lanzhou\, 730000\, China)\, Y.K. Gupta (N
uclear Physics Division\, Bhabha Atomic Research Centre\, Mumbai-400085\,
India)\, B.K. Nayak (Nuclear Physics Division\, Bhabha Atomic Research Cen
tre\, Mumbai-400085\, India)\, S. Mukherjee (Department of Physics\, Facul
ty of Science\, The M.S. University of Baroda\, Vadodara 390 002\, India)\
, Q. Hu (Institute of Modern Physics\, Chinese Academy of Sciences\, Lanzh
ou\, 730000\, China)\, Y. Y. Yang (Institute of Modern Physics\, Chinese A
cademy of Sciences\, Lanzhou\, 730000\, China)\, F. F. Duan (Institute of
Modern Physics\, Chinese Academy of Sciences\, Lanzhou\, 730000\, China)\,
S. L. Jin (Institute of Modern Physics\, Chinese Academy of Sciences\, La
nzhou\, 730000\, China)\, D. Patel (Institute of Modern Physics\, Chinese
Academy of Sciences\, Lanzhou\, 730000\, China)\, P. Ma (Institute of Mode
rn Physics\, Chinese Academy of Sciences\, Lanzhou\, 730000\, China)\, Alo
k Saxena (Nuclear Physics Division\, Bhabha Atomic Research Centre\, Mumba
i-400085\, India)\n\nRecently\, elastic scattering has been of great inter
est to study the information on the exotic structure and reaction mechanis
m of the weakly bound nuclei. In the last few years\, some of the experime
ntal and theoretical works have appeared for proton as well as neutron-ric
h nuclei at above and near barrier energies [1-3]. Interesting features ha
ve been discovered in the study of the elastic scattering induced by light
radioactive ion beams. Strong Coulomb rainbow (Coulomb-nuclear interferen
ce peak) suppressions are found for neutron halo nuclei such as 11Be\,11Li
and 6He elastic scattering from heavy targets at energy near the Coulomb
barrier. However\, elastic scattering with proton halo nuclei does not rev
eal Coulomb rainbow suppressions showing small break-up coupling effects o
n elastic scattering at an energy about three times the Coulomb barrier. U
nder this scenario\, a systematic study on elastic scattering at well abov
e the Coulomb barrier energy is required to unfold the new observations in
the reactions with near drip-line nuclei [4\, 5]. In this context\, we ha
ve measured elastic scattering at three times of the Coulomb barrier energ
y using 10Be projectile beam at Institute of Modern Physics\, Lanzhou. The
secondary beams of radioactive isotopes were produced by the fragmentatio
n of (60 MeV/nucleon) 16O primary beam on a 3000 µm Be target and separat
ed by Radioactive Ion Beam Line in Lanzhou (RIBLL). The scattered particl
es were detected by four sets of ∆E-E detector telescopes. A Monte Carlo
simulation is performed to evaluate the absolute differential cross secti
ons. Continuum Discretized Coupled Channels method will be followed to dis
entangle the Coulomb and Nuclear breakup coupling effects on the suppressi
on of Coulomb Rainbow. The detailed observations made from the measured el
astic scattering data along with the theoretical calculations using FRESCO
will be presented in the conference. \n\nKeywords: Elastic scattering\, h
alo nuclei\, Coulomb and Nuclear breakup coupling\n\nReferences\n\n[1]J. J
. Kolata et al.\, Eur. Phys. J. A 52\, 123 (2016).\n[2]Y. Y. Yang\, J. S.
Wang\, Q. wang et al.\, Nucl. Instrum. Methods Phys. Res. Sect. A 701\, 1
(2013).\n [3]A. G´omez Camacho et al.\, Nucl. Phys. A 833\, 156 (2010).
\n[4]Y. Y. Yang\, X. Liu\, D. Y. Pang et al.\, Phys.Rev. C 94\, 034614 (20
16).\n[5]Y. Y. Yang\, J. S. Wang\, Q. wang et al.\, Phys.Rev. C 90\, 01460
6 (2014).\n\nhttps://indico2.riken.jp/event/2536/contributions/11079/
LOCATION:Kunibiki Messe (Matsue)
URL:https://indico2.riken.jp/event/2536/contributions/11079/
END:VEVENT
END:VCALENDAR