Pieter Doornenbal
(RIKEN)
20/02/2013, 09:35
An overview of in-beam gamma-ray spectroscopy at the RIBF will be given.
Yosuke KONDO
(Tokyo Institute of Technology)
20/02/2013, 11:20
The first experimental campaign using the new spectrometer SAMURAI was carried out in May, 2012. I will introduce SAMURAI and report the campaign in the workshop. Future SAMURAI experiment together with MINOS will also be discussed.
Tomohiro Uesaka
(CNS, University of Tokyo)
20/02/2013, 11:50
He Wang
(RIKEN Nishina Center)
20/02/2013, 12:10
The structure of the nuclei around doubly magic nucleus 132Sn (Z=50, N=82)
is of great importance from the nuclear structure point of view as well as
the nuclear astrophysics point of view. The newly commissioned rare isotope
facilities in the RIBF provide great opportunities to explore this region. We have
invesigated the structure of the nuclei beyond 132Sn via an in-beam γ-ray...
Pieter Doornenbal
(RIKEN)
20/02/2013, 13:40
Paul Fallon
(Lawrence Berkeley Laboratory)
20/02/2013, 14:00
The two-proton knockout reaction from 42Si was used to produce 40Mg at the RI Beam Factory, RIKEN Nishina Center. The status and results of this experiment will be presented in connection with the goal to measure gamma-ray decays from excited states and using the direct reaction cross-section to derive information on the structure of 42Si and 40Mg. Possible steps towards future experiments...
Masafumi Matsushita
(Center for Nuclear Study, University of Tokyo)
20/02/2013, 14:20
Excited states in the nuclei 38,40,42Si have been studied using in-beam gamma-ray spectroscopy following multi-nucleon removal reactions to investigate the systematics of excitation energies along the $Z=14$ isotopic chain.
Experiment have been performed at RIBF with high intensity 48Ca beam emplyed to produce the secondary beams of 40S and 44S. The DALI2 gamma-ray spectrometer have been...
David Steppenbeck
(University of Tokyo)
20/02/2013, 14:40
The structures of neutron-rich nuclei around Ca-54 were investigated using in-beam gamma-ray spectroscopy via nucleon knockout reactions with Sc-55 and Ti-56 radioactive beams at the RIBF. This was the first experimental campaign at the facility to use a Zn-70 primary beam at 345 MeV/u. In this presentation a summary of the results and experiment details will be given, and future prospects for...
Volker Werner
(Yale University)
20/02/2013, 15:00
Isotopes below Nickel about N=40 are known to exhibit enhanced
collectivity, instead of signatures of an N=40 sub-shell closure which
is evident in 68Ni. The enhancement of collectivity has been seen in
Fe and Cr isotopes in the region through the lowering of 2+1 energies
as well as rise in B(E2) excitation strengths, mainly due to an early
population of the neutron g9/2 orbital. We...
Simon Boissinot
(CEA Saclay)
20/02/2013, 15:20
In the context of nuclear structure evolution with isospin towards the drip-line and local magic numbers phenomena, gamma-spectroscopy of nuclei located in the neutron-rich region around 54Ca is intensively investigated. Indeed, shell-model calculations using the GXPF1 interaction have indicated a new sub-shell closure at N=34. However, this is not confirmed experimentally by the 2+ excitation...
Shunji Nishimura
(Researcher)
20/02/2013, 16:30
Eiji Ideguchi
(RCNP, Osaka University)
20/02/2013, 17:00
A project to construct a Compton-suppressed Ge Clover array by combining
the Clover Ge detectors in Japan and the U.S. is proposed to study in detail
excited states in exotic nuclei produced at the RIBF facility in RIKEN.
This array will be suited for studies utilizing energy-degraded RI beams and also stopped RI beams.
Before starting experiments using the Clover array at RIBF,...
Susumu Shimoura
(CNS, University of Tokyo)
21/02/2013, 09:30
Takashi Nakamura
(Tokyo Institute of Technology)
21/02/2013, 10:00
The breakup reactions of neutron rich nuclei near N=20 and N=28 have been measured with C and Pb targets at about 240 MeV/nucleon at the ZDS spectrometer at RIBF. The breakup with a light target is induced primarily by the nuclear interaction, which is sensitive to the single-particle state of the removed neutron. The gamma ray detected by the DALI2 detector in coincidence with the outgoing...
Alexandre Obertelli
(CEA Saclay)
21/02/2013, 10:20
The coulomb excitation of 104Sn was measured in July 2012 at RIBF. At the same time, nuclear inelastic scattering from 12C and hydrogen has been undertaken, as well as neutron-removal cross section measurements.
These new data sets provide valuable information on open question of collectivity in light Tin isotopes. The cross section measurement should (i) give a better understanding on the...
Ken-ichiro YONEDA
(RIKEN Nishina Center)
21/02/2013, 10:40
Clementine Santamaria
(CEA Saclay, SPhN)
21/02/2013, 11:20
Expected to be doubly magic, 78Ni is a key nucleus to further understand the nuclear shell structure.
Its spectroscopy will allow to probe the Z=28 and N=50 shell closures for neutron-rich nuclei. Several experiments on neighbouring nuclei have been performed to this end.
The study of N=50 isotones reveals that copper (Z=29), zinc (Z=30), germanium (Z=32) and selenium (Z=34) isotopic chains...
Megumi NIIKURA
(Department of Physics, University of Tokyo)
21/02/2013, 11:40
We will propose an experiment for coming MINOS campaign at RIBF to investigate proton shell evolution towards to 78Ni by means of in-beam gamma-ray spectroscopy. The goal of the experiment is to characterize a proton f7/2 hole states in the Cu isotopes populated by one-proton knockout reaction: (p,2p). This will allow us to understand a migration of shell structure induced by the tensor part...
Masayasu Ishihara
(RIKEN Nishina Center)
21/02/2013, 12:00
In-beam gamma-ray spectroscopy with RI beams has been cultivated and intensively used in the last two decades to make a major contribution to the progress of the spectroscopy on nuclei far from stability. The main reaction processes so far used with in-flight RI beams are the intermediate-energy Coulex, proton inelastic scattering, and one-nucleon removal reactions. These processes have been...
Eiji Ideguchi
(RCNP, Osaka University)
21/02/2013, 13:30
A life-time measurement of excited states in neutron-rich deformed nuclei in the mass A≈60 region is planned (NP0906-RIBF07). The recoil distance method (RDM) using the intermediate energy RI beams will be used to measure the lifetimes of 2+ and 4+ states in 60-64Cr and their neighbors. The Big RIPS fragment separator at RIBF will be used to produce the neutron-rich isotope beams in N~40...
Oliver Wieland
(INFN sezione di Milano)
21/02/2013, 13:50
Medium-heavy neutron rich isotopes are cheacterized by a layer of excess neutrons on the nuclear surface. The question whether the excess neutrons in the skin can be excited to perform collective oscillations against the N=Z core has attracted considerable interest in recent years.
Results and proposed experiments at RIKEN and GSI will be discussed.
Additionally possible experimental...
Andrea Jungclaus
(Instituto de Estructura de la Materia - CSIC)
21/02/2013, 14:10
We propose to study the excitation and decay of a second excited 2+ state in the nucleus 136Te at an excitation energy around 1.5-1.6 MeV which is predicted by theoretical calculations to be of mixed-symmetry character. This study will allow to explore for the first time the potential of the Coulomb excitation technique at intermediate energies for the study of mixed-symmetry states (MSS) in...
Zsolt Dombradi
(MTA ATOMKI)
21/02/2013, 14:30
For the previous PAC meetings we submitted proposals to study the structure of neutron rich nuclei via proton inelastic scattering and nucleon removal reactions. Availability of a new hydrogen target and the MINOS setup may trigger the resubmission of the proposals.
At one of the first PAC meetings we proposed the study of odd nuclei below the N=50 shell closure to get information on...
Thomas Aumann
(Technische Universitaet Darmstadt)
21/02/2013, 14:50
An experimental campaign has been initiated in order to investigate the dipole response of tin isotopes, in particular, the low-energy part of the spectrum including the Pygmy Dipole Resonance. Stable and unstable isotopes will be investigated utilizing different probes. The program includes experiments at the photon tagger NEPTUN, the HiGS facility, R3B-LAND, and at RIBF. At the RIBF at...
He Wang
(RIKEN Nishina Center)
21/02/2013, 15:10
We propose to upgrade NP-0702-RIBF-31 experiment. The proposal is aiming
for a systematic study of the nuclear structure beyond 132Sn using high energy
RI beams produced by in-flight fission of 238U at BigRIPS. 238U primary beam
with higher intensity is available at RIBF. It provides great opportunities to
explorer more in this region.
