Hiroyoshi Sakurai
(RIKEN Nishina Center for Accelerator-Based Science)
23/05/2011, 10:10
Toshiyuki Kubo
(RIKEN Nishina Center)
23/05/2011, 10:30
Pieter Doornenbal
(RIKEN),
Shunji Nishimura
(Researcher)
23/05/2011, 10:50
Kenta Yoshinaga
(Tokyo University of Science)
23/05/2011, 11:10
A drastic shape evolution is predicted in neutron-rich nuclei around A=110 [1].
For the Zr isotopes, a deformation may reach a maximum by a deformed shell-closure.
Energies of low-lying states which are known up to N=64 show the increase of the deformation from N=60 to 64.
However, the maximization of the deformation has not been observed as a function of neutron numbers.
Furthermore, a...
Christoph Hinke
(Physik Department E12 TU Muenchen, Germany)
23/05/2011, 11:35
The investigation of the shell structure far from the valley of stability
is a major task in modern nuclear structure physics, especially close to the drip lines. By fragmentation of a 1.0 A GeV 124Xe beam from the GSI accelerators 100Sn and neighbouring nuclei have been produced, separated in the FRS and identified by multiple deltaE, Brho and ToF measurements. The nuclei were stopped in an...
Shunji Nishimura
(Researcher)
23/05/2011, 13:30
Berta Rubio
(CSIC Valencia)
23/05/2011, 14:10
Studies of the Tz = -1 → 0 beta decays of 42Ti, 46Cr, 50Fe and 54Ni to the self-conjugate nuclei 42Sc, 46V, 50Mn, and 54Co respectively (P.h.D Thesis,Francisco Molina- Univ. Valencia) will be presented. The nuclei of interest were produced in the fragmentation of a 58Ni beam of 680 MeV/nucleon at GSI. The ions were separated using the Fragment Recoil Separator (FRS) and implanted into a set of...
Jose Javier Valiente Dobon
(LNL-INFN)
23/05/2011, 14:30
Shell closures are a fundamental concept in nuclear physics
and most of our knowledge of effective nucleon-nucleon interactions comes from the
study of nuclei with few valence particles around doubly-magic cores. There are by now a wealth of data coming from the study of exotic nuclei showing that the relative energies of the shell-model orbitals are not immutable but can change and evolve...
Atsuko Odahara
(Department of Physics, Osaka University)
23/05/2011, 15:10
David Verney
(Institut de Physique Nucleaire - IN2P3-CNRS / University Paris Sud-11)
23/05/2011, 16:00
The PARRNe ISOL device has been operating at IPN Orsay since 10 years. Originally conceived as a test bench for R&D studies in the framework of SPIRAL2, the performance of the setup has proven suitable to undertake a physics research program on the evolution of N=50 towards 78Ni by beta-decay studies. During the past decade, several experiments were realized using either the Tandem as a...
Shunji Nishimura
(Researcher)
23/05/2011, 16:20
Study of doubly-closed-shell and neighboring nuclei provides great opportunities for testing of nuclear models and expanding our knowledge of nucleosynthesis processes. Especially, the region around 78Ni (Z=28, N=50) has attracted great interests because of its extreme neutron-to-proton ratio in the region far from the valley of stability. Despite of a great deal of theoretical activity...
Toshiyuki Sumikama
(Tokyo University of Science)
23/05/2011, 16:40
Shape evolution around 110Zr attracts much attention because shape transition from prolate to oblate, spherical or more exotic tetrahedral shapes has been predicted by many authors. 110Zr is expected to be a spherical shape due to a possible subshell closure at N=70 [1]. Furthermore, the transition to an oblate shape may appear in more neutron-rich region [2].
We performed the experiment...
Pieter Doornenbal
(RIKEN)
23/05/2011, 17:20
Hiroshi Watanabe
(RIKEN Nishina Center)
23/05/2011, 17:40
I will present possible decay spectroscopy experiments using the E(U)RICA
array
at RIBF, aiming at studying neutron-rich nuclei in the vicinity of the
doubly magic
nucleus 132Sn and the doubly mid-shell nucleus 170Dy
Hans-Jürgen Wollersheim
(GSI Helmholtzzentrum)
24/05/2011, 10:00
Patrick Regan
(University of Surrey)
24/05/2011, 10:35
Some of the science highlights for the Stopped Beam RISING experimental campaigns at GSI will be reviewed using both passive and active stopping materials. These include isomer and beta-decay studies along the N=Z line from 56Ni up to 100Sn; isomer spectroscopy of shell-model configurations around the doubly magic systems 132Sn and 208Pb; and the use of beta-delayed gamma-ray spectroscopy for...
Radomira Lozeva
(IPHC, CNRS, IN2P3)
24/05/2011, 11:10
Within the RISING collaboration a g-factor campaign has been performed on magnetic moment measurements of isomeric states in neutron-rich Sn isotopes and in the neutron-deficient Pb-region. For the first time the experimental technique has been successfully applied at relativistic energies for radioactive isotopes produced by 238U fission and 136Xe fragmentation on 9Be targets and traversing...
Yuichi Ichikawa
(RIKEN Nishina Center)
24/05/2011, 11:45
The nuclear spin alignment in an excited state results in anisotropy of angular distribution in Gamma-ray emission, which provides us a chance to measure nuclear observables through various spectroscopic techniques. Especially the time-differential perturbed angular distribution (TDPAD) method is one of the major techniques to determine a g-factor of an isomeric state with a lifetime of ns -...
Nori Aoi
(RIKEN Nishina Center)
24/05/2011, 13:30
Eiji Ideguchi
(CNS, University of Tokyo)
24/05/2011, 14:05
We plan to perform an experiment at the BigRIPS fragment separator at RIKEN to study prolate-oblate shape transitions in neutron rich Mo and Tc nuclides. Existing mean field calculations predict dramatic changes in the ground-state shape in this part of the nuclide chart. To test the validity of the theoretical model framework in the regime, new experimental data in the form of energies of...
Toshiyuki Sumikama
(Tokyo University of Science)
24/05/2011, 14:25
Low-energy nuclear reactions such as fusion-evaporation, multi-step Coulomb excitation, transfer reactions, etc. are important probes to investigate exotic structure of unstable nuclei. While RIBF provides world's most intense RI beams, an energy of about 250 MeV/A is much higher than required energies for low-energy reactions.
At the last NP-PAC meeting, we proposed the development of...
Hidetada Baba
(RIKEN)
24/05/2011, 14:40
Pieter Doornenbal
(RIKEN),
Shunji Nishimura
(Researcher)
24/05/2011, 15:30
Dr
Javier Valiente Dobon
(INFN Laboratori Nazionali di Legnaro)
Several theoretical studies based on the concept of the mean field, Woods-Saxon, Strutinsky and Hartree-Fock have predicted tetrahedral symmetry in nuclei. Tetrahedral symmetry leads to a tetrahedron shape which would be the most symmetric shape in nuclei to be discovered. Although some evidences for such structures have been found no conclusive proof has yet been provided for their existence....
Dr
Javier Valiente Dobon
(INFN Laboratori Nazionali di Legnaro)
Isospin formalism, which describes the neutron and the proton as two states of the same particle, the nucleon, is amongst the essential descriptive tools of a vast range of nuclear phenomena. The broad success of the isospin symmetry concept belies its broken nature. Not only is the symmetry broken by the proton-neutron mass difference and the Coulomb interaction, but also by the...
