Chinese Physics C > 2005, Vol. 29 > Issue(11): 1047-1051

Collective Dand Structures in Doubly Odd¹³⁶La Nucleus

Department of Physics, Tsinghua University, Beijing 100084, China2 China Institute of Atomic Energy, Beijing 102413, China

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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 h _11/2neutrons. 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 $\gamma\approx -60^\circ$. They most probably originate from four- and six- quasiparticle configurations, that is,$\uppi h_{11/2}\otimes\upnu g_{7/2} h_{11/2}^2$ and $\uppi g_{7/2}\otimes\upnu g_{7/2}^2 d_{5/2}h_{11/2}^2$ respectively.

References

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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 and LI Guang-Sheng. Collective Dand Structures in Doubly Odd ¹³⁶La Nucleus[J]. Chinese Physics C, 2005, 29(11): 1047-1051.

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Received: 2005-02-02
Revised: 1900-01-01

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通讯作者:陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Collective Dand Structures in Doubly Odd¹³⁶La Nucleus

Corresponding author:ZHU Sheng-Jiang,

Department of Physics, Tsinghua University, Beijing 100084, China2 China Institute of Atomic Energy, Beijing 102413, China

Received Date:2005-02-02

Accepted Date:1900-01-01

Available Online:2005-11-05

Abstract:Using heavy-ion nuclear reaction and in-beam γ-ray spectroscopy technique,high spin states of¹³⁶La have been studied. The nuclear reaction used is¹³⁰Te(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 h_11/2neutrons. 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 $\gamma\approx -60^\circ$. They most probably originate from four- and six- quasiparticle configurations, that is,$\uppi h_{11/2}\otimes\upnu g_{7/2} h_{11/2}^2$ and $\uppi g_{7/2}\otimes\upnu g_{7/2}^2 d_{5/2}h_{11/2}^2$ respectively.

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Collective Dand Structures in Doubly Odd¹³⁶La Nucleus

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