Dr
Hiroshi Watanabe
(RIKEN)
06/09/2016, 10:15
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)
06/09/2016, 10:40
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)
06/09/2016, 11:05
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)
06/09/2016, 11:30
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)
06/09/2016, 11:55
Short Oral
Status of new isotope search will be reported.
Mr
Byul Moon
(Korea University), Prof.
Chang-Bum Moon
(Hoseo University)
06/09/2016, 13:30
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)
06/09/2016, 13:55
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...
Rin Yokoyama
(CNS)
06/09/2016, 14:15
Oral
Experimental results on the excited states of neutron-rich Z=56 to 61 nuclei will be exhibited. Large prolate deformation is expected in this region and many K isomers were observed. Shape evolution including higher-order deformations such as octupole or hexadecupole shapes will be discussed from the systematics of the excitation energies of isomer or g.s.-band states.
Dr
Atsuko Odahara
(Department of Physics, Osaka University)
07/09/2016, 10:25
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)
07/09/2016, 10:50
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)
07/09/2016, 11:10
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)
07/09/2016, 11:35
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)
07/09/2016, 11:50
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)
07/09/2016, 13:30
Short Oral
Status of decay spectroscopy experiment (RIBF-026) will be reported.
Dr
Kathrin Wimmer
(Central Michigan University)
07/09/2016, 13:50
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)
07/09/2016, 14:10
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)
07/09/2016, 14:35
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.
