Dr
Hiroyoshi Sakurai
(RIKEN Nishina Center for Accelerator-Based Science)
9/6/16, 10:00 AM
Short Oral
Dr
Shunji Nishimura
(Researcher)
9/6/16, 10:05 AM
Short Oral
The isotopes taken taken by EURICA spectrometer during the last five years will be presented. The data sharing will be discussed.
Dr
Hiroshi Watanabe
(RIKEN)
9/6/16, 10:15 AM
Oral
RIBF80 experiment, “Structural changes between N=40 and N=50 next to Ni isotopes: a joint proposal” was performed in spring 2013 using a 238U beam at 345 MeV/u. Average beam intensity was about 10 pnA and the experiment was carried out for ~3 days.
BigRIPS was tuned to transmit 71Fe in the central trajectory and nuclei ranging from Mn to Cu were successfully implanted in the WAS3ABi array,...
Dr
Shunji Nishimura
(Researcher)
9/6/16, 10:40 AM
Oral
The status of the β-decay half-life for neutron-rich nuclei will be reported using the WAS3ABi and EURICA spectrometer.
Dr
Megumi NIIKURA
(Department of Physics, University of Tokyo)
9/6/16, 11:05 AM
Oral
A β-decay spectroscopy experiment in the closest vicinity of 78Ni was performed at RIBF as a part of the EURICA campaign. The low-lying level structure in odd-mass isotonic chain along the neutron magic number of N=50 is determined by the neutron single-particle evolution with decreasing proton number. Some reduction of the neutron single-particle energy gap between 2d5/2 and 3s1/2 orbitals...
Prof.
Alison Bruce
(University of Brighton)
9/6/16, 11:30 AM
Oral
Abstract (text):
In May 2013 the EURICA array was augmented with 18 LaBr3(Ce) detectors so that short level-lifetimes could be measured. The performance of the LaBr3(Ce) array will be outlined and results of measurements on the first 2+ states in 104,106Zr [1] will be presented and discussed in terms of the deformations extracted for the nuclei. Additional results on new isomers observed...
Dr
Yohei Shimizu
(RIKEN Nishina Center)
9/6/16, 11:55 AM
Short Oral
Status of new isotope search will be reported.
Mr
Byul Moon
(Korea University), Prof.
Chang-Bum Moon
(Hoseo University)
9/6/16, 1:30 PM
Oral
The experimental results are exhibited based on the beta-decay schemes for the Sb, Te, and I nuclides beyond N = 82. We provide for the first time the internal level structures of 140Te, 140I, and 142I, as showing the beta-decay lifetime measurements of the corresponding decay processes. The observed level structures and decay schemes will be discussed briefly systematically with the help of...
Mr
James Keatings
(University of the West of Scotland)
9/6/16, 1:55 PM
Oral
Level schemes of the neutron-rich nuclei 136,137,138Sb have been constructed from beta- and beta-n decay data gathered during the EURICA campaign.
Decay schemes were constructed from ion-beta-gamma coincidence events and these are the first reports of excited states in 137,138Sb and the first level
scheme of 136Sb derived from beta-decay data. With only one proton beyond the Z=50 shell...
Prof.
Yoshitaka Fujita
(Research Center for Nuclear Physics (Toyonaka), Osaka Univeristy)
9/6/16, 3:30 PM
Oral
Isospin symmetry is based on the almost identical `behavior' of
proton and neutron in terms of the strong interaction.
However, due to isospin breaking interactions, including
electro-magnetic interaction, slight asymmetry is associated with
the nuclear structure of mirror nuclei.
We have been studying Tz=\pm 1-->0, Tz=\pm 3/2-->\pm 1/2, and
Tz=\pm 2-->\pm 1 mirror Gamow-Teller (GT)...
Daiki Nishimura
(Tokyo University of Science)
9/6/16, 3:55 PM
Oral
Gamow-Teller (GT) transitions play important roles in the studies of nuclear structure and nucleosynthesis. In the A = 58 isobars, the GT transition strengths to the states in 58Cu have been measured by high-resolution 58Ni(3He,t)58Cu reactions of ΔE ~ 30 keV. In order to discuss isospin symmetry in the A = 58 isobars, we studied the β decay of 58Zn. In addition, the β decay of 58Zn has the...
Dr
Alejandro Algora
(IFIC (CSIC-Univ. Valencia))
9/6/16, 4:15 PM
Oral
The main goal of the RIBF93 experiment is the study isospin symmetry and isoscalar pn-pairing in A~70 region. The experiment was performed in June 2015 as part of the EURICA campaign using the high intensity 78Kr beam provided by RIKEN.
In this talk the motivations and the status of the analysis of the RIBF93 experiment will be presented. From the produced isotopes we have started the...
Mr
Giuseppe Lorusso
(RIKEN)
9/6/16, 5:10 PM
Oral
With a beta-decay half-life of 17s, 72Kr is a main waiting point for the rp-process in accreting neutron stars. The effective half-life in stellar environment could be, however, significantly reduced by the 72Kr(2p,g)74Sr reaction. To accurately model the rp-process flow in this reaction channel, the proton separation energy of the proton unbound nucleus 73Rb is required. In the experiment,...
Dr
Bertram Blank
(CEN Bordeaux-Gradignan)
9/6/16, 5:35 PM
Oral
In pioneering experiments at GANIL and GSI, this 2p radioactivity was discovered in 2002 and meanwhile 45Fe, 48Ni and 54Zn are established 2p emitters.
After these discovery experiments, the investigation of 2p radioactivity was continued with time-projection chambers to study the decay dynamics via measurements of the individual proton energies and the relative proton-proton emission...
Dr
Shunji Nishimura
(Researcher)
9/6/16, 7:00 PM
Dr
Paul Davies
(University of York)
9/7/16, 9:00 AM
Oral
There are a significant number of isomeric states in the region close to the N=Z line and immediately below 100Sn, some of which may decay via particle emission. The study of these states yields vital experimental data on neutron-proton (np) pairing, provides a sensitive test for nuclear models, and input for understanding the astrophysical rp-process.
This presentation will report on...
Mr
Daniel Lubos
(Technische Universität München)
9/7/16, 9:25 AM
Oral
100Sn is the heaviest doubly magic N=Z nucleus. Calculations in the extreme single particle
model predict a pure Gamow-Teller transition [1] and more recent realistic large scale shell model
(LSSM) calculations also show that this transition is fragmented by less than 5% [2]. Thus, the
transition 100Sn ! 100In is the ideal playground in order to derive the full transition strength...
Mr
Jason Park
(University of British Columbia / TRIUMF)
9/7/16, 9:45 AM
Oral
The doubly-magic 100Sn stands as a testing ground for many topics of nuclear structure, such as N = Z = 50 shell strength in proximity to the proton dripline, and evolution in the single particle structure and shell evolution. For decades, these have been actively investigated in both theoretical and experimental efforts. In order for modern large-scale shell model calculations with...
Dr
Atsuko Odahara
(Department of Physics, Osaka University)
9/7/16, 10:25 AM
Oral
Shape evolution is one of the most important subjects to understand competition between single-particle and collective motions in nuclei as a function of neutron and proton numbers. Study of shape evolution in very neutron-rich nuclei became possible by the EURICA project. The nuclei around neutron-rich doubly-magic nucleus $^{132}$Sn indicate characteristics with spherical shape, whereas the...
Mr
Jeongsu Ha
(Seoul National University)
9/7/16, 10:50 AM
Oral
In the EURICA experiment, beta-ray events and ion events are separately recorded and it requires an algorithm for associating the beta events and the ion events. We have developed more elaborate methods to increase the correlated events by using beta-ray tracking and ion position correction. Based on the new algorithm, the level-schemes of neutron-rich Mo isotopes are under investigation....
Prof.
Patrick Regan
(University of Surrey)
9/7/16, 11:10 AM
Oral
This presentation will report on the experimental results from EURICA experiments focussed on the isomer-decay spectroscopy of nuclei in the region of the prolate-deformed, 170Dy valence maximum. In particular the excitation energies of the ground state (K=0+) and gamma (K=2+) band members will be presented [1,2] together with isomer spectroscopy of the neighbouring Tb nuclei [3]. These...
Mr
Cesar Lizarazo
(Technische Universität Darmstadt)
9/7/16, 11:35 AM
We will report on the gamma-ray spectroscopic information on 92,94Se after isomeric decay measured with the EURICA array in the scope of the 2nd campaing of the SEASTAR project conducted in RIKEN, May 2015. The nuclei of interest where produced via in-flight fragmentation of 238U @ 345MeV/A and selected using the BigRIPS fragment separator. The selected fission products passed through a LH2...
Mr
Noritaka Kitamura
(Center for Nuclear Study, University of Tokyo)
9/7/16, 11:50 AM
Short Oral
There are a number of isomeric states in the mass range around A = 180.
The most interesting one in this region would be the long-lived
high-spin 178m2Hf isomer.
If a target which contains nanogram quantities of 178m2Hf is fabricated, the door to explore high-spin nuclear reactions will be opened. To this end, we performed a feasibility study to produce the isomeric state using the fusion...
Dr
Toshiyuki Sumikama
(RIKEN Nishina Center)
9/7/16, 1:30 PM
Short Oral
Status of decay spectroscopy experiment (RIBF-026) will be reported.
Dr
Kathrin Wimmer
(Central Michigan University)
9/7/16, 1:50 PM
Oral
Experiment RIBF140 was the last experiment performed with EURICA. The aim is to investigate the structural evolution the N=40 nuclei. In two settings neutron-rich nuclei around 64Cr were implanted in the newly constructed AIDA implantation detector array. In this talk I will present an overview of the goals of the experiment and some first results on the spectroscopy of nuclei around N=40.
Dr
Gary Simpson
(LPSC, Université Joseph Fourier Grenoble)
9/7/16, 2:10 PM
Oral
Beta and beta-n decay spectroscopy of the parent 131-136In nuclei has been performed within the EURICA campaign.
This had the aim of studying the semi-magic Sn nuclei, whose single-particle (seniority) structure forms a sensitive test of
the ingredients of shell-model calculations. Level schemes of 131-134Sn will be presented and comments
made about inconsistencies and anomalies present in...
Dr
Alfredo Estrade
(University of Edinburgh)
9/7/16, 2:35 PM
Oral
Experiment RIBF1306 was run in June 2016 during the final EURICA campaign. The goal of the experiment is a combined measurement of nuclear masses (with the time-of-flight technique) and decay spectroscopy of neutron-rich isotopes in a region critial to understand the formation of the first r-process abundance peak. I will present the details of the experimental setup and the status of data analysis.
