학술논문
Evidence of oblate-prolate shape coexistence in the strongly-deformed nucleus 119Cs
Document Type
article
Author
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
Source
Physics Letters B, Vol 822, Iss , Pp 136645- (2021)
Subject
Language
English
ISSN
0370-2693
Abstract
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.