Shape evolution and test of the critical-point symmetry X(5) in ^(176)Os  

作　　者：郝昕 竺礼华 吴晓光 李广生 潘波 王烈林 郑云 汪雷 李雪琴 刘颖 丁怀博 李忠宇 

机构地区：[1]China Institute of Atomic Energy [2]Faculty of Science, ShenZhen University [3]Department of Physics, Jilin University [4]Department of Physics, Tsinghua University

出　　处：《Chinese Physics C》2009年第S1期151-153,共3页中国物理C（英文版）

基　　金：Supported by Major State Basic Research Development Program (2007CB815000);National Natural Science Foundation of China (10775184, 10675171, 10575133, 10575092, 10375092)

摘　　要：The lifetimes of excited states in the yrast band of 176Os have been measured up to I = 20 level using the Doppler shift attenuation method. The high-spin states of 176Os were populated via fusion evaporation reaction 152Sm(28Si,4n)176Os at a beam energy of 140 MeV. The results support an X(5) structure for 176Os at low spin. This structure disappears at high spin and shows a symmetry rotor character. The shape change of 176Os is similar to that of 178Os.The lifetimes of excited states in the yrast band of 176Os have been measured up to I = 20 level using the Doppler shift attenuation method. The high-spin states of 176Os were populated via fusion evaporation reaction 152Sm(28Si,4n)176Os at a beam energy of 140 MeV. The results support an X(5) structure for 176Os at low spin. This structure disappears at high spin and shows a symmetry rotor character. The shape change of 176Os is similar to that of 178Os.

关 键 词：shape evolution critical point symmetry LIFETIME 

分 类 号：O571[理学—粒子物理与原子核物理]