Shape Co-Existence in the Transitional Nuclide <sup>157</sup>Yb

XU Chuan(徐川); HUA Hui(华辉); LI Xiangqing(李湘庆); ZHANG Shuangquan(张双全); XU Furong(许甫荣); SHI Yue(石跃); ZHU Lihua(竺礼华); WU Xiaoguang(吴晓光); LI Guangsheng(李广生); HE Chuangye(贺创业)

doi:10.1088/1009-0630/14/6/16

Plasma Science and Technology > 2012 > 14(6): 510-513. > DOI: 10.1088/1009-0630/14/6/16

XU Chuan(徐川), HUA Hui(华辉), LI Xiangqing(李湘庆), ZHANG Shuangquan(张双全), XU Furong(许甫荣), SHI Yue(石跃), ZHU Lihua(竺礼华), WU Xiaoguang(吴晓光), LI Guangsheng(李广生), HE Chuangye(贺创业). Shape Co-Existence in the Transitional Nuclide ¹⁵⁷Yb[J]. Plasma Science and Technology, 2012, 14(6): 510-513. DOI: 10.1088/1009-0630/14/6/16

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Shape Co-Existence in the Transitional Nuclide ¹⁵⁷Yb

1 School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China 2 China Institute of Atomic Energy, Beijing 102413, China

Funds: support by the Natural Science Foundation of China No. (10775005, 10405001, 10875002, 10735010, 10975007, 10875157, J0730316) and, the Chinese Major State Basic Research Development Program (No. 2007CB815002)

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Received Date: May 16, 2011

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Abstract

Abstract

High-spin states in ¹⁵⁷Yb have been populated in the ¹⁴⁴Sm(¹⁶O, 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 νf7/2 band, and the previously known νi13/2 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 νf7/2 band and the νi13/2 band in ¹⁵⁷Yb undergo a shape evolution with sizable alignments occurring.
- ¹⁵⁷Yb,
- shape coexistence,
- shape evolution,
- triaxial particle-rotor model,
- Total-Routhian-Surface

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