Shape-coexisting rotation in neutron-deficient Hg and Pb nuclei

C. F. Jiao (焦长峰), Yue Shi (石跃), H. L. Liu (刘红亮), F. R. Xu (许甫荣), and P. M. Walker
Phys. Rev. C 91, 034309 – Published 9 March 2015

Abstract

For a shape-soft nucleus, the deformation change with increasing angular momentum of rotation can be significant. Total-Routhian-surface (TRS) calculations include the shape changes, but angular momentum is not conserved (neither is it a good quantum number, nor is it kept unchanged in the whole TRS mesh). In the projected shell model (PSM), the angular momentum appears as a good quantum number, but calculations have usually been performed with fixed deformation. In the present work, by performing angular-momentum projection on the mean-field potential-energy surface (PES), we can obtain an angular-momentum-conserved PES which gives deformation for a rotational state at a given spin. In order to investigate the shape-changing effect, we have chosen neutron-deficient Hg and Pb isotopes in which shape coexistence occurs. We interpret the irregular rotational behavior of the oblate bands at low spin as arising from deformation changes which are induced by collective rotation. At higher spin, the oblate rotational spectrum can also be influenced by the crossing between the K=0 ground-state band and a low-K two-quasineutron band. Calculated g factors for the states of oblate bands are given for future experimental testing, and the intrinsic structures of high-K oblate states are investigated.

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  • Received 17 November 2014
  • Revised 21 January 2015

DOI:https://doi.org/10.1103/PhysRevC.91.034309

©2015 American Physical Society

Authors & Affiliations

C. F. Jiao (焦长峰)1, Yue Shi (石跃)1, H. L. Liu (刘红亮)2, F. R. Xu (许甫荣)1,3,*, and P. M. Walker4

  • 1State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
  • 2Department of Applied Physics, Xi'an Jiaotong University, Xi'an 710049, China
  • 3State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 4Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom

  • *frxu@pku.edu.cn

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Vol. 91, Iss. 3 — March 2015

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