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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[2]	CHE Xing-Lai , ZHU Sheng-Jiang , CHEN Yong-Jing , DING Huai-Bo , LI Ming-Liang . High Spin Band Structure in ¹¹²Ru. Chinese Physics C, 2006, 30(S2): 154-156.
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[4]	LUO Peng , ZHANG Yu-Hu , ZHOU Xiao-Hong , LIU Min-Liang , GUO Ying-Xiang , LIU Zhong , LEI Xiang-Guo , SONG Li-Tao , ZHENG Yong , WANG Hua-Lei , YU Hai-Ping , XIE Cheng-Ying , . Experimental Observation of High Spin States in ¹³⁵La Nucleus. Chinese Physics C, 2004, 28(5): 495-501.
[5]	WANG Hua-Lei , ZHANG Yu-Hu , ZHOU Xiao-Hong , GUO Ying-Xiang , LEI Xiang-Guo , LIU Min-Liang , TUO Peng , XIE Cheng-Ying , SONG Li-Tao , YU Hai-Ping , ZHENG Yong , GUO Wen-Tao , , , , . Observation of πh_11/2⊙νi_13/2 Band in Doubly-Odd ¹⁷⁰Re and Its Systematic Analysis. Chinese Physics C, 2004, 28(S1): 47-49.
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[11]	ZHANG Yu-Hu , WEN Shu-Xian , ZHU Li-Hua . Signature Inversion Phenomena in the Rotational Bands of Odd-Odd ¹⁷⁶Ir. Chinese Physics C, 2002, 26(5): 445-449.
[12]	DONG Bao-Guo , GUO Hong-Chao , Ingemar Ragnarsson . Shape Coexistence and Band Termination in ¹³¹La. Chinese Physics C, 2002, 26(3): 266-272.
[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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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