Evidence of oblate-prolate shape coexistence in the strongly-deformed nucleus 119Cs

Physics Letters B

P.W. Zhao¹  R. Julin²  C.M. Petrache²  Ö. Aktas³  M. Doncel⁴  J. Timár⁴  D.T. Joss⁵  R.D. Page⁵  I. Kuti⁶  B.M. Nyakó⁶  S. Guo⁶  M.L. Liu⁶  C. Andreoiu⁷  D. Sohler⁷  Y.K. Wang⁸  A. Astier⁹  B.F. Lv⁹  M. Sandzelius^1,10  J. Ojala^1,10  A. Ertoprak^1,10  J. Partanen^1,10  H. Tann^1,10  S. Juutinen^1,10  J. Pakarinen^1,10  G. Zimba^1,10  J. Sarén^1,10  B. Cederwall^1,10  M. Luoma^1,10  W. Zhang^1,10  P. Ruotsalainen^1,10  J. Uusitalo^1,10  P. Rahkila^1,10  Z.H. Zhang^1,11  P.T. Greenlees^1,11  T. Grahn^1,11  K.K. Zheng^1,11 

[1] Corresponding author.;Key Laboratory of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom;School of Nuclear Science and Technology, University of Chinese Academy of Science, Beijing 100049, China;Institute for Nuclear Research (Atomki-ELKH), 4001 Debrecen, Hungary;KTH Department of Physics, S-10691 Stockholm, Sweden;Key Laboratory of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;Mathematics and Physics Department, North China Electric Power University, Beijing 102206, China;State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China;University of Jyväskylä, Department of Physics, P.O. Box 35, FI-40014, University of Jyväskylä, Finland;Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France;

关键词: Nuclear reaction:58Ni(64Zn,3p)119Cs;    Measured γγγ-coincidences;    Angular correlations;    Linear polarization;    Model calculation;    Oblate-prolate coexistence;   

DOI  :  

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown