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

Li, X. Q. and Xu, C. and Zhang, S. Q. and Hua, H. and Meng, J. and Gál, János and Kalinka, Gábor and Nyakó Barna, Mátyás and Timár, János (2016) Spectroscopy of Yb 155: Structure evolution in the N=85 isotones. PHYSICAL REVIEW C, 94 (2). pp. 1-6. ISSN 0556-2813

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Abstract

High-spin states in Yb155 have been studied via the Sm144(O16,5n)Yb155 reaction at a beam energy of 118 MeV. One negative-parity and one positive-parity cascade built on the νf7/2 and νi13/2 states, respectively, are established for the first time. The structures observed in Yb155 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 Yb155. © 2016 American Physical Society.

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