Evidence of oblate-prolate shape coexistence in the strongly-deformed nucleus <SUP>119</SUP>Cs

Zheng, KK, Petrache, CM, Zhang, ZH, Zhao, PW, Wang, YK, Astier, A, Lv, BF, Greenlees, PT, Grahn, T, Julin, R
et al (show 26 more authors) (2021) Evidence of oblate-prolate shape coexistence in the strongly-deformed nucleus <SUP>119</SUP>Cs. PHYSICS LETTERS B, 822. p. 136645.

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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.

Item Type: Article
Uncontrolled Keywords: Nuclear reaction:Ni-58(Zn-64,3p)Cs-119, Measured gamma gamma gamma-coincidences, Angular correlations, Linear polarization, Model calculation, Oblate-prolate coexistence
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 30 Sep 2021 10:21
Last Modified: 17 Oct 2023 17:25
DOI: 10.1016/j.physletb.2021.136645
Open Access URL: https://doi.org/10.1016/j.physletb.2021.136645
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3138807