Spectroscopy of Yb-157 and structure evolutions in odd-A Yb isotopes

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

PHYSICAL REVIEW C（2013）

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摘要

The spectroscopy of Yb-157 has been studied via Sm-144(O-16, 3n)Yb-157 fusion-evaporation reaction. The properties of bands associated with the vi(13/2) orbital and vh(9/2) orbital in Yb-157 are analyzed in comparison with the triaxial particle-rotor-model calculations. The characters of signature splitting for both positive-parity vi(13/2) and negative-parity vh(9/2) bands in Yb-157 and heavier odd-A Yb isotopes are discussed. The newly observed bands 1 and 2 in Yb-157 are suggested to be the signature partners of the vh(9/2) band. A systematic study of the band crossing frequencies associated with the i(13/2) neutron-pair and h(11/2) proton-pair alignments for the Yb isotopes, as well as the Er and Hf isotopes, are made. DOI: 10.1103/PhysRevC.87.034325

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