New insight into the shape coexistence and shape evolution of Yb157

C. Xu, H. Hua, X. Q. Li, J. Meng, Z. H. Li, F. R. Xu, Y. Shi, H. L. Liu, S. Q. Zhang, Z. Y. Li, L. H. Zhu, X. G. Wu, G. S. Li, C. Y. He, S. G. Zhou, S. Y. Wang, Y. L. Ye, D. X. Jiang, T. Zheng, J. L. LouL. Y. Ma, E. H. Wang, Y. Y. Cheng, C. He

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Abstract

High-spin states in Yb157 have been populated in the Sm144(O16,3n)Yb157 fusion-evaporation reaction at a beam energy of 85 MeV. Two rotational bands built on the νf7/2 and νh9/2 intrinsic states, respectively, have been established for the first time. The newly observed νf7/2 band and previously known νi13/2 band in Yb157 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 Yb157 provide evidence for shape coexistence of three distinct shapes: prolate, triaxial, and oblate. At higher spins, both the νf 7/2 band and νi13/2 band in Yb157 undergo a shape evolution with sizable alignments occurring.

Original languageEnglish
Article number014318
JournalPhysical Review C - Nuclear Physics
Volume83
Issue number1
DOIs
StatePublished - 28 Jan 2011
Externally publishedYes

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