Shape coexistence and evolution in neutron-def icient krypton isotopes  

作　　者：柏志军 付熙明 焦长峰 许甫荣 

机构地区：[1]State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University [2]National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention [3]Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina

出　　处：《Chinese Physics C》2015年第9期43-47,共5页中国物理C（英文版）

基　　金：Supported by National Key Basic Research Program of China(2013CB83440)'';National Natural Science Foundation of China(11235001,11320101004)

摘　　要：Total Routhian Surface （TRS） calculations have been performed to investigate shape coexistence and evolution in neutron-deficient krypton isotopes 72,74,76Kr. The ground-state shape is found to change from oblate in 72Kr to prolate in 74,76Kr, in agreement with experimental data. Quadrupole deformations of the ground states and coexisting 0＋ states as well as excitation energies of the latter are also well reproduced. While the general agreement between calculated moments of inertia and those deduced from observed spectra confirms the prolate nature of the low-lying yrast states of all three isotopes （except the ground state of 72Kr）, the deviation at low spins suggests significant shape mixing. The role of triaxiality in describing shape coexistence and evolution in these nuclei is finally discussed.Total Routhian Surface （TRS） calculations have been performed to investigate shape coexistence and evolution in neutron-deficient krypton isotopes 72,74,76Kr. The ground-state shape is found to change from oblate in 72Kr to prolate in 74,76Kr, in agreement with experimental data. Quadrupole deformations of the ground states and coexisting 0＋ states as well as excitation energies of the latter are also well reproduced. While the general agreement between calculated moments of inertia and those deduced from observed spectra confirms the prolate nature of the low-lying yrast states of all three isotopes （except the ground state of 72Kr）, the deviation at low spins suggests significant shape mixing. The role of triaxiality in describing shape coexistence and evolution in these nuclei is finally discussed.

关 键 词：shape coexistence neutron-deficient KRYPTON TRS moment of inertia TRIAXIALITY 

分 类 号：O571.5[理学—粒子物理与原子核物理]