Spectroscopy of Yb 155: Structure evolution in the N=85 isotones

X. Q. Li,C. Xu,S. Q. Zhang,H. Hua,J. Meng,R. A. Bark,Q. B. Chen, C. Y. Niu, R. Han,S. M. Wyngaardt,S. Y. Wang,S. Wang,B. Qi,L. Liu,L. H. Zhu, Z. Shi,G. L. Zhang,B. Sun, X. Y. Le, C. Y. Song,Y. L. Ye,D. X. Jiang,F. R. Xu,Z. H. Li, J. J. Sun,Y. Shi,P. W. Zhao,W. Y. Liang,C. G. Li,C. G. Wang,X. C. Chen,D. P. Sun,C. Liu,Z. Q. Li,P. Jones,E. A. Lawrie,J. J. Lawrie,M. Wiedeking,T. D. Bucher,T. S. Dinoko,B. V. Kheswa, L. Makhathini,S. N. T. Majola, J. Ndayishimye,S. P. Noncolela,O. Shirinda,J. Gal,G. Kalinka,J. Molnar, B. M. Nyakó,J. Timár,K. Juhász, M. Arogunjo

PHYSICAL REVIEW C（2016）

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摘要

High-spin states in Yb-155 have been studied via the Sm-144(O-16, 5n)Yb-155 reaction at a beam energy of 118 MeV. One negative-parity and one positive-parity cascade built on the nu f(7/2) and nu i(13/2) states, respectively, are established for the first time. The structures observed in Yb-155 are compared with those in the neighboring N = 85 isotones and with semiempirical shell-model (SESM) calculations. According to adiabatic and configuration-fixed constrained triaxial covariant density functional theory (CDFT) calculations, a coexistence of prolate and oblate shapes is predicted to exist in Yb-155.

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