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Structure change of 156Yb at high-spin states

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【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；

【Author】 HUA Hui1;1) LI Zhong-Yu1 WANG Shou-Yu2 MENG Jie1 LI Zhi-Huan1 LI Xiang-Qing1 XU Fu-Rong1 LIU Hong-Liang1 ZHANG Shuang-Quan1 ZHOU Shan-Gui3,4 YE Yan-Lin1 JIANG Dong-Xing1 ZHENG Tao1 ZHU Li-Hua5 WU Xiao-Guang5 LI Guang-Sheng5 HE Chuang-Ye5 MA Li-Ying1 LU Fei1 FAN Feng-Ying1 HAN Li-Ying1 WANG He1 XIAO Jun1 LI Xue-Qin5 CHEN Dong1 FANG Xiao1 LOU Jian-Lin1 LIU Ying5 HAO Xin5 PAN Bo5 LI Li-Hua5 1 (School of Physics and MOE key laboratory of Heavy Ion Physics, Peking University, Beijing 100871, China) 2 (Department of Space Science and Applied Physics, Shandong University at Weihai, Weihai 264209, China) 3 (Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, China) 4 (Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China) 5 (China Institute of Atomic Energy, Beijing 102413, China)

【机构】 School of Physics and MOE key laboratory of Heavy Ion Physics, Peking University； Department of Space Science and Applied Physics, Shandong University at Weihai； Institute of Theoretical Physics, Chinese Academy of Sciences； Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator； China Institute of Atomic Energy；

【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.

【Abstract】 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；
【Key words】 high-spin states； 156Yb； structure change； alignment； fusion-evaporation；
【基金】 Supported by National Natural Science Foundation of China (10405001, 10775005, 10735010, 10605001, J0730316);Chinese Major State Basic Research Development Program (2007CB815002)
  • 【文献出处】 中国物理C ,Chinese Physics C , 编辑部邮箱 ,2009年S1期
  • 【分类号】O571
  • 【下载频次】47
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