Evidence of oblate-prolate shape coexistence in the strongly-deformed nucleus 119Cs
oleh: K.K. Zheng, C.M. Petrache, Z.H. Zhang, P.W. Zhao, Y.K. Wang, A. Astier, B.F. Lv, P.T. Greenlees, T. Grahn, R. Julin, S. Juutinen, M. Luoma, J. Ojala, J. Pakarinen, J. Partanen, P. Rahkila, P. Ruotsalainen, M. Sandzelius, J. Sarén, H. Tann, J. Uusitalo, G. Zimba, B. Cederwall, Ö. Aktas, A. Ertoprak, W. Zhang, S. Guo, M.L. Liu, I. Kuti, B.M. Nyakó, D. Sohler, J. Timár, C. Andreoiu, M. Doncel, D.T. Joss, R.D. Page
| Format: | Article |
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| Diterbitkan: | Elsevier 2021-11-01 |
Deskripsi
Prolate-oblate shape coexistence close to the ground state in the strongly-deformed proton-rich A≈120 nuclei is reported for the first time. One of the four reported bands in 119Cs, built on a 11/2− state at 670 keV, consists of nearly degenerate signature partners, and has properties which unequivocally indicate the strongly-coupled πh11/2[505]11/2− configuration associated with oblate shape. Together with the decoupled πh11/2[541]3/2− band built on the 11/2− prolate state at 110 keV, for which a half-life of T1/2=55(5)μs has been measured, the new bands bring evidence of shape coexistence at low spin in the proton-rich strongly deformed A≈120 nuclei, a phenomenon predicted since long time, but not yet observed. Calculations using the particle-number conserving cranked shell model and two dimensional tilted axis cranking covariant density functional theory support and well reproduce the observed oblate and prolate coexisting low-energy states in 119Cs.