Structure change of ^(156)Yb at high-spin states  

作　　者：华辉 李忠宇 王守宇 孟杰 李智焕 李湘庆 许甫荣 刘红亮 张双全 周善贵 叶沿林 江栋兴 郑涛 竺礼华 吴晓光 李广生 贺创业 马立英 卢飞 范凤英 韩丽英 王赫 肖军 李雪琴 陈东 方晓 楼建玲 刘颖 郝昕 潘波 李立华 

机构地区：[1]School of Physics and MOE key laboratory of Heavy Ion Physics, Peking University [2]Department of Space Science and Applied Physics, Shandong University at Weihai [3]Institute of Theoretical Physics, Chinese Academy of Sciences [4]Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator [5]China Institute of Atomic Energy

出　　处：《Chinese Physics C》2009年第S1期148-150,共3页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10405001, 10775005, 10735010, 10605001, J0730316);Chinese Major State Basic Research Development Program (2007CB815002)

摘　　要：High-spin states of 156Yb have been studied via the 144Sm(16O,4n)156Yb fusion-evaporation reaction at beam energy 102 MeV. The positive-parity yrast band and negative-parity cascade have been extended up to higher-spin states, respectively. The characteristics of the negative-parity sequence above the 25-state may related to the excitation from the nucleon in the Z =64, N =82 core. The E-GOS curve for the positiveparity yrast sequence in 156Yb indicate that this nucleus may undergo an evolution from quasivibrational to quasirotational structure with increasing angular momentum. The Cranked Woods-Saxon-Strutinsky calculations by means of Total-Routhian-Surface (TRS) methods has been made to understand this structure change.High-spin states of 156Yb have been studied via the 144Sm(16O,4n)156Yb fusion-evaporation reaction at beam energy 102 MeV. The positive-parity yrast band and negative-parity cascade have been extended up to higher-spin states, respectively. The characteristics of the negative-parity sequence above the 25-state may related to the excitation from the nucleon in the Z =64, N =82 core. The E-GOS curve for the positiveparity yrast sequence in 156Yb indicate that this nucleus may undergo an evolution from quasivibrational to quasirotational structure with increasing angular momentum. The Cranked Woods-Saxon-Strutinsky calculations by means of Total-Routhian-Surface (TRS) methods has been made to understand this structure change.

关 键 词：high-spin states 156Yb structure change ALIGNMENT fusion-evaporation 

分 类 号：O571[理学—粒子物理与原子核物理]