Experimental Observation of High Spin States in <SUP>135</SUP>La Nucleus

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

Chinese Physics C> 2004, Vol. 28> Issue(5) : 495-501

Experimental Observation of High Spin States in ¹³⁵La Nucleus

Institute of Modern Physics,The Chinese Academy of Science,Lanzhou 730000,China2 Graduate School of the Chinese Academy of Sciences,Beijing 100039,China3 Department of Physics,Jilin University,Changchun 130012,China4 Institute of Physics and Tandem Accelerator Center,University of Tsukuba,Ibaraki 305-006,Japan

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Abstract：
High spin states of ¹³⁵La have been experimentally studied by using ¹²⁸Te(¹⁰B, 3n) ¹³⁵La reaction at 46 MeV beam energy. Based on the γ-γ coincidence relationships, relative intensities and ADO ratios, a level scheme of ¹³⁵La has been established. Both signature components of the πh_11/2 negative-parity band and a band crossing at ω≈0.40MeV were observed. In view of the systematics of the N=78 isotones, this backbending is proposed to be caused by the alignment of a pair of πh_11/2 protons. The πh_11/2 protons drive the nuclear core towards γ≈0°, the collective prolate shape. In addition, a ΔI=1 negative-parity band with strong M1 transitions and a very small signature splitting was observed. Comparing with the systematic features of ΔI=1 bands in neighboring odd-proton nuclei in this mass region, the πh_11/2(νh_11/2)² configuration was assigned to the ΔI=1 bands of ¹³⁵La. The alignment of the h_11/2 neutron pair drives the nuclear core towards γ≈-60°, the collective oblate shape.

References

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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 and Experimental Observation of High Spin States in ¹³⁵La Nucleus[J]. Chinese Physics C, 2004, 28(5): 495-501.

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Received: 2003-10-16
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

Experimental Observation of High Spin States in ¹³⁵La Nucleus

Corresponding author: ZHANG Yu-Hu,

Institute of Modern Physics,The Chinese Academy of Science,Lanzhou 730000,China2 Graduate School of the Chinese Academy of Sciences,Beijing 100039,China3 Department of Physics,Jilin University,Changchun 130012,China4 Institute of Physics and Tandem Accelerator Center,University of Tsukuba,Ibaraki 305-006,Japan

Received Date: 2003-10-16

Accepted Date: 1900-01-01

Available Online: 2004-05-05

Abstract: High spin states of ¹³⁵La have been experimentally studied by using ¹²⁸Te(¹⁰B, 3n) ¹³⁵La reaction at 46 MeV beam energy. Based on the γ-γ coincidence relationships, relative intensities and ADO ratios, a level scheme of ¹³⁵La has been established. Both signature components of the πh_11/2 negative-parity band and a band crossing at ω≈0.40MeV were observed. In view of the systematics of the N=78 isotones, this backbending is proposed to be caused by the alignment of a pair of πh_11/2 protons. The πh_11/2 protons drive the nuclear core towards γ≈0°, the collective prolate shape. In addition, a ΔI=1 negative-parity band with strong M1 transitions and a very small signature splitting was observed. Comparing with the systematic features of ΔI=1 bands in neighboring odd-proton nuclei in this mass region, the πh_11/2(νh_11/2)² configuration was assigned to the ΔI=1 bands of ¹³⁵La. The alignment of the h_11/2 neutron pair drives the nuclear core towards γ≈-60°, the collective oblate shape.

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Experimental Observation of High Spin States in 135La Nucleus

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Experimental Observation of High Spin States in 135La Nucleus

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Experimental Observation of High Spin States in ¹³⁵La Nucleus

Experimental Observation of High Spin States in ¹³⁵La Nucleus