Evidence of oblate-prolate shape coexistence in the strongly-deformed nucleus 119Cs
Résumé
Prolate-oblate shape coexistence close to the ground state in the strongly-deformed proton-rich nuclei is reported for the first time. One of the four reported bands in 119Cs, built on a state at 670 keV, consists of nearly degenerate signature partners, and has properties which unequivocally indicate the strongly-coupled configuration associated with oblate shape. Together with the decoupled band built on the prolate state at 110 keV, for which a half-life of has been measured, the new bands bring evidence of shape coexistence at low spin in the proton-rich strongly deformed 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.
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