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Evidence of oblate-prolate shape coexistence in the strongly-deformed nucleus Cs
- Source :
- Physics Letters
- Publication Year :
- 2021
- Publisher :
- Elsevier, 2021.
-
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 $^{119}$Cs, 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 $^{119}$Cs.
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Physics Letters
- Accession number :
- edsair.od......3000..17d4dea19ec42146cfee9f2890fb616b