Shape Co-Existence in the Transitional Nuclide 157Yb

High-spin states in 157Yb have been populated in the 144Sm（160, 3n）157yb fusion- evaporation reaction at a beam energy of 85 MeV, and two rotational bands have been established for the first time. Within the framework of the triaxial particle-rotor model, the energy spectra and single-particle confi...

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Published in:等离子体科学和技术：英文版 2012, Vol.14 (6), p.510-513
Main Author: 徐川 华辉 李湘庆 张双全 许甫荣 石跃 竺礼华 吴晓光 李广生 贺创业
Format: Article
Language:English
Subjects:
实验数据
形状共存
核素
熔合蒸发反应
电子束能量
结构特征
转子模型
高自旋态
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Summary:High-spin states in 157Yb have been populated in the 144Sm（160, 3n）157yb fusion- evaporation reaction at a beam energy of 85 MeV, and two rotational bands have been established for the first time. Within the framework of the triaxial particle-rotor model, the energy spectra and single-particle configurations of 157Yb are investigated. The calculated energy spectra agree well with the experimental data. The newly observed vf7/2 band, and the previously known vi13/2 band in 157Yb, are also discussed by means of Total-Routhian-Surface methods. The structural characters observed in 157Yb provide evidence for the shape coexistence of three distinct shapes： prolate, triaxial and oblate. At higher spins, both the vf7/2 band and the vi13/2 band in 157Yb undergo a shape evolution with sizable alignments occurring.
ISSN:1009-0630