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Collective Dand Structures in Doubly Odd 136La Nucleus
Authors:ZHU Sheng-Jiang  XIAO Shu-Dong  CHE Xing-Lai  YU Ying-Nan  LI Ming-Liang  CHEN Yong-Jing  ZHU Li-Hua  WEN Shu-Xian  WU Xiao-Guang  LI Guang-Sheng
Affiliation: Department of Physics, Tsinghua University, Beijing 100084, China2 China Institute of Atomic Energy, Beijing 102413, China
Abstract:Using heavy-ion nuclear reaction and in-beam γ-ray spectroscopy technique,high spin states of 136La have been studied. The nuclear reaction used is 130Te(11B,5n) with a beam energy 60MeV. The level scheme with three collective band structures has been updated with spin up to 20h. The collective backbending has been observed in $uppi h_{11/2}otimes upnu h_{11/2}$ band. According to the TRS calculations,this backbending is due to the alignment of a pair of h11/2 neutrons. The signature splitting and inversion for the $uppi h_{11/2}otimes upnu h_{11/2}$ band were also discussed. Other two bands based on $12^-$ and $16^+$ levels were proposed as oblate deformation with $gammaapprox -60^circ$. They most probably originate from four- and six- quasiparticle configurations, that is,$uppi h_{11/2}otimesupnu g_{7/2} h_{11/2}^2$ and $uppi g_{7/2}otimesupnu g_{7/2}^2 d_{5/2}h_{11/2}^2$ respectively.
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