Evidence of oblate-prolate shape coexistence in the strongly-deformed nucleus 119Cs
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
Published inPhysics Letters B
Lv, B.F. |
Tann, H. |
Guo, S. |
Kuti, I. |
© 2021 The Author(s). Published by Elsevier B.V.
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 πh11/211/2− configuration associated with oblate shape. Together with the decoupled πh11/23/2− 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.
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Additional information about fundingThis work has been supported by the China Scholarship Council (CSC), CSC No. 201804910386. This work has been supported by the Academy of Finland under the Finnish Centre of Excellence Programme (2012-2017), by the EU 7th Framework Programme Project No. 262010 (ENSAR), by the United Kingdom Science and Technology Facilities Council; by the National Research, Development and Innovation Fund of Hungary (Project No. K128947), as well as by the European Regional Development Fund (Contract No. GINOP-2.3.3-15-2016-00034); by the Swedish Research Council under Grant No. 2019-04880; and by the National Natural Science Foundation of China (Grants No. 11505242, No. 11305220, No. U1732139, No. 11775274, and No. 11575255). C.A. is supported by the Natural Sciences and Engineering Research Council of Canada. The use of germanium detectors from the GAMMAPOOL is acknowledged. I.K. was supported by National Research, Development and Innovation Office-NKFIH, contract number PD 124717. ...
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