Nuclear structure study for the neutron-rich cadmium nuclei beyond 132Sn

5 Jun 2018, 11:36
18m
Kunibiki Messe (Matsue)

Kunibiki Messe

Matsue

Oral contribution Session 6

Speaker

Dr He Wang (RIKEN Nishina Center)

Description

Nuclear structure study for exotic nuclei far away the stability is one of major topics in today’s nuclear physics research. In particular, the neutron-rich nuclei beyond 132Sn provide a pivot region to explore the exotic nuclear structure because 132Sn is doubly magic and locates far away the stability. In this region, two phenomena in nuclear structure have attracted much attention in recent years: the persistence 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.

To address these two questions, neutron-rich cadmium isotopes are critical. 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 study 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 role of neutron in low-lying excitation in more neutron-rich system.

Aiming at investigating the exotic nuclear structure beyond 132Sn, we have measured reduced transition possibility B(E2) for the semi-magic nucleus 130Cd and 2+ state in 132Cd at the RI Beam Factory. Coulomb excitation at around 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 rays emitted from the excited states were measured via the DALI2 spectrometer. In the presentation, the newly obtained BE2 value and 2+ state for 130Cd and 132Cd, respectively, will be discussed and experimental details will be given.

Primary author

Dr He Wang (RIKEN Nishina Center)

Co-authors

Dr Alexandre Obertelli (TU Darmstadt) Dr Andrea Jungclaus (Instituto de Estructura de la Materia - CSIC) Dr Avigo Riccardo (INFN) Dr Christopher Bauer (TU Darmstadt) Dr Clementine Santamaria (NSCL, MSU) Dr David Steppenbeck (RIKEN Nishina Center) Dr Eiji Ideguchi (RCNP, Osaka University) Dr Hideaki Otsu (RIKEN Nishina Center) Dr Hidetada Baba (RIKEN) Dr Hiroyoshi Sakurai (RIKEN Nishina Center for Accelerator-Based Science) Hongna Liu (CEA Saclay) Dr Jenny Lee (The University of Hong Kong) Mr Jin Wu (RIKEN) Dr Ken-ichiro YONEDA (RIKEN Nishina Center) Dr Masafumi Matsushita (Center for Nuclear Study, University of Tokyo) Dr Megumi NIIKURA (Department of Physics, the University of Tokyo) Dr Nori AOI (RCNP, Osaka Univ.) Dr Pieter Doornenbal (RIKEN) Dr Pär-Anders Söderström (RIKEN Nishina Center) Mr Ryo Taniuchi (Department of Physics, Graduate School of Science, The University of Tokyo) Satoru Momiyama (Department of Physics, University of Tokyo) Dr Satoshi TAKEUCHI (Tokyo Institute of Technology) Dr Shunji Nishimura (RIKEN Nishina Center) Dr Tadaaki Isobe (RIKEN) Dr Tetsuya Yamamoto (RCNP) Dr Tohru Motobayashi (RIKEN Nishina Center) Dr Toshiyuki Sumikama (RIKEN Nishina Center) Mr Zhengyu Xu (University of Tokyo) Dr Zoltan Elekes (MTA ATOMKI) Dr Zsolt Dombradi (MTA ATOMKI) Mr Zsolt VAJTA (MTA Atomki)

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