Collective Dand Structures in Doubly Odd <SUP>136</SUP>La Nucleus

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

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

Collective Dand Structures in Doubly Odd ¹³⁶La 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_11/2 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 $\gamma\approx -60^\circ$. 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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[9]	ZHU Sheng-Jiang , XU Rui-Qing , ZHANG Zheng , JIANG Zhuo , GAN Cui-Yun . Collective Bands in Neutron-Rich ¹⁰⁷Ru Nucleus. Chinese Physics C, 2002, 26(8): 791-796.
[10]	GAN Zai-Guo , LIU Zhong , ZHANG Yu-Hu , PAN Qiang-Yan . A New Isomer State in ¹³⁶Ba. Chinese Physics C, 2002, 26(8): 814-817.
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[13]	ZHAO Guang-Yi , LU Jing-Bin , MA Ying-Jun , YIN Li-Chang , LI Xian-Feng , LI Zhi-Huan , WANG Zhi-Kui , WU Xiao-Guang , LI Guang-Sheng , WEN Shu-Xian , YANG Chun-Xiang , LIU Yun-Zuo . Systematic Features of π1/2^－[541]⊙νi_13/2 Bands in Doubly-Odd Nuclei. Chinese Physics C, 2000, 24(S1): 33-37.
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[16]	ZHU ShengJiang , GAN CuiYun , ZHU LingYan , YANG LiMing , XU RuiQing , JON MyonGil , JIANG Zhuo , ZHANG Zheng , . Collective Band Structures in Neutron-Rich Odd-A ^145,147Ce Nuclei. Chinese Physics C, 2000, 24(11): 1018-1023.
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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 Odd ¹³⁶La 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 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_11/2 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 $\gamma\approx -60^\circ$. 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 Odd ¹³⁶La Nucleus

Collective Dand Structures in Doubly Odd ¹³⁶La Nucleus