23-24 May 2011
RIKEN Nishina Center
Asia/Tokyo timezone

First results of beta-gamma spectroscopy for neutron-rich nuclei around A=110 at RIBF

23 May 2011, 11:10
25m
RIBF Building 2F Conference Room (RIKEN Nishina Center)

RIBF Building 2F Conference Room

RIKEN Nishina Center

2-1 Hirosawa, Wako, Saitama 351-0198, Japan

Speaker

Kenta Yoshinaga (Tokyo University of Science)

Description

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 spherical shape may appear around 110Zr due to a possible sub-shell closure at N=70 [2]. For neutron-rich isotopes with Z > 40, a shape transition from prolate to oblate shapes is predicted around A=110 [1] and an oblate-shape isomer may appear. In addition, beta-decay half-lives of this neutron-rich region are required to study the r-process nucleosynthesis. We performed a first beta-gamma spectroscopy experiment with stopped beams at RIBF for neutron-rich A~110 nuclei. In this workshop, I'll show an experimental overview and first results related to the shape evolution of the Zr and Nb isotopes [3,4], and beta-decay half-lives [5]. [1] J. Skalski et al., Nucl. Phys. A 617, 282 (1997). [2] M. Bender et al., Phys. Rev. C 80, 064302 (2009). [3] T. Sumikama et al., Phys. Rev. Lett. to be published. [5] H. Watanabe et al., Phys. Lett. B 696, 186 (2011). [4] S. Nishimura et al., Phys. Rev. Lett. 106, 052502 (2011).

Primary author

Kenta Yoshinaga (Tokyo University of Science)

Co-author

Toshiyuki Sumikama (Tokyo University of Science)

Presentation Materials