A1 Journal article (refereed)
Evidence of oblate-prolate shape coexistence in the strongly-deformed nucleus 119Cs (2021)
Zheng, K.K., Petrache, C.M., Zhang, Z.H., Zhao, P.W., Wang, Y.K., Astier, A., Lv, B.F., Greenlees, P.T., Grahn, T., Julin, R., Juutinen, S., Luoma, M., Ojala, J., Pakarinen, J., Partanen, J., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., . . . Page, R.D. (2021). Evidence of oblate-prolate shape coexistence in the strongly-deformed nucleus 119Cs. Physics Letters B, 822, Article 136645. https://doi.org/10.1016/j.physletb.2021.136645
JYU authors or editors
Publication details
All authors or editors: Zheng, K.K.; Petrache, C.M.; Zhang, Z.H.; Zhao, P.W.; Wang, Y.K.; Astier, A.; Lv, B.F.; Greenlees, P.T.; Grahn, T.; Julin, R.; et al.
Journal or series: Physics Letters B
ISSN: 0370-2693
eISSN: 1873-2445
Publication year: 2021
Volume: 822
Article number: 136645
Publisher: Elsevier
Publication country: Netherlands
Publication language: English
DOI: https://doi.org/10.1016/j.physletb.2021.136645
Publication open access: Openly available
Publication channel open access: Open Access channel
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/77951
Publication is parallel published: https://repo.scoap3.org/records/64685
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.
Keywords: nuclear physics; cesium
Free keywords: Nuclear reaction; 58Ni(64Zn,3p)119Cs; Measured γγγ-coincidences; Angular correlations; Linear polarization; Model calculation; Oblate-prolate coexistence
Contributing organizations
Ministry reporting: Yes
Reporting Year: 2021
JUFO rating: 2