New insight into the shape coexistence and shape evolution of Yb-157
New insight into the shape coexistence and shape evolution of Yb-157
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DOI：
10.1103/physrevc.83.014318
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发表时间：
2011-01
影响因子：
3.1
通讯作者：
C. Xu;H. Hua;X. Li;J. Meng;Z. Li;F. Xu;Yue Shi;H. Liu;S. Zhang;Ziyu Li;L. Zhu;Xiaoguang Wu;Guang-sheng Li;Chao He;Shan-Gui Zhou;S. Y. Wang;Y. Ye;D. Jiang;T. Zheng;J. Lou;L. Ma;E. Wang;Y. Y. Cheng-Y.;Chuang-ye He
中科院分区：
文献类型：
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作者：
C. Xu;H. Hua;X. Li;J. Meng;Z. Li;F. Xu;Yue Shi;H. Liu;S. Zhang;Ziyu Li;L. Zhu;Xiaoguang Wu;Guang-sheng Li;Chao He;Shan-Gui Zhou;S. Y. Wang;Y. Ye;D. Jiang;T. Zheng;J. Lou;L. Ma;E. Wang;Y. Y. Cheng-Y.;Chuang-ye He
Yb-157 中的高自旋态已在束流能量为 85 MeV 的 Sm-144(O-16,3n)Yb-157 聚变蒸发反应中填充。首次建立了分别建立在 nu f(7/2) 和 nu h(9/2) 本征态上的两个旋转能带。利用总劳斯面法讨论了Yb-157中新观察到的nu f(7/2)带和先前已知的nu i(13/2)带，并与邻近的N = 87等音素中的结构进行了比较。在 Yb-157 中观察到的结构特征为三种不同形状的共存提供了证据：长长形、三轴形和扁圆形。在更高的自旋下，Yb-157 中的 nu f(7/2) 能带和 nu i(13/2) 能带都经历了形状演化，并发生了相当大的排列。
High-spin states in Yb-157 have been populated in the Sm-144( O-16,3n)Yb-157 fusion-evaporation reaction at a beam energy of 85 MeV. Two rotational bands built on the nu f(7/2) and nu h(9/2) intrinsic states, respectively, have been established for the first time. The newly observed nu f(7/2) band and previously known nu i(13/2) band in Yb-157 are discussed in terms of total Routhian surface methods and compared with the structures in the neighboring N = 87 isotones. The structural characters observed in Yb-157 provide evidence for shape coexistence of three distinct shapes: prolate, triaxial, and oblate. At higher spins, both the nu f(7/2) band and nu i(13/2) band in Yb-157 undergo a shape evolution with sizable alignments occurring.