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 positive-parity 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.
HUA Hui ZHOU Shan-Gui YE Yan-Lin JIANG Dong-Xing ZHENG Tao ZHU Li-Hua WU Xiao-Guang LI Guang-Sheng HE Chuang-Ye MA Li-Ying LU Fei LI Zhong-Yu FAN Feng-Ying HAN Li-Ying WANG He XIAO Jun LI Xue-Qin CHEN Dong FANG Xiao LOU Jian-Lin LIU Ying HAO Xin WANG Shou-Yu PAN Bo LI Li-Hua MENG Jie LI Zhi-Huan LI Xiang-Qing XU Fu-Rong LIU Hong-Liang ZHANG Shuang-Quan
School of Physics and MOE key laboratory of Heavy Ion Physics, Peking University, Beijing 100871, Ch Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, China;Center of Theor China Institute of Atomic Energy, Beijing 102413, China Department of Space Science and Applied Physics, Shandong University at Weihai, Weihai 264209, China