Experimental Study of High-spin States in Odd-Odd Nuclei around 160-180 Mass Region

ZHANG Yu-Hu; ZHAO Qing-Zhong; ZHANG Shuang-Quan; ZHOU Xiao-Hong; XU Hu-Shan; HUANG Wen-Xue; GUO Ying-Xiang; LEI Xiang-Guo; LIU Zhong; LU Jun; FENG Xi-Chen; GOU Quan-Bu

Chinese Physics C> 2000, Vol. 24> Issue(S1) : 21-28

Experimental Study of High-spin States in Odd-Odd Nuclei around 160-180 Mass Region

Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou 730000,China2 China Institute of Atomic Energy,Beijing 102413,China3 Japan Atomic Energy Research Institute,Tokai,Ibaraki 319-1195,Japan4 Chiba University,Inage-ku,Chiba 263-8512,Japan5 Chiba Institute of Technology,Narashino,Chiba 275-0023,Japan6 Institute of Physics and Tandem Accelerator Center,University of Tsukuba,Ibaraki 305-0006,Japan

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Abstract：
In recent years,high-spin states in a series of deformed odd-odd nuclei ¹⁶²Lu,¹⁷⁰Ta,¹⁷⁴Re,^176,178,180Ir and 182Au have been studied in corporation with the researchers in the IMP (Institute of Modem Physics,CAS),CIAE (China Institute of Atomic Energy) and JAERI (Japan Atomic Energy Research Institute).The experimental results are reviewed in this report.The interesting phenomenon of low-spin signature inversion in both the πh_11/2⊙νi_13/2 and πh_9/2⊙νi_13/2 configurations has been systematically studied and discussed for the nuclei in this mass region.A possible lowspin signature inversion is suggested for the πh_13/2⊙νi_13/2 structure in ^182,184Au and the limited experimental data seem to support such suggestion.The gradual alignment gains with rotation are reported ,for the first time,in the πh_11/2⊙νi_13/2 bands of odd-odd ^178,180Ir.An unexpected smaller band crossing frequency is observed in ¹⁷⁸Ir(most probably in the πd_5/2⊙νh_9/2 configuration).These anomalies may be associated with the configuration-dependent deformations and/or neutron pairing.

References

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ZHANG Yu-Hu, ZHAO Qing-Zhong, ZHANG Shuang-Quan, ZHOU Xiao-Hong, XU Hu-Shan, HUANG Wen-Xue, GUO Ying-Xiang, LEI Xiang-Guo, LIU Zhong, LU Jun, FENG Xi-Chen, GOU Quan-Bu, Experimental Study of High-spin States in Odd-Odd Nuclei around 160-180 Mass Region[J]. Chinese Physics C, 2000, 24(S1): 21-28.

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Received: 1900-01-01
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Experimental Study of High-spin States in Odd-Odd Nuclei around 160-180 Mass Region

Corresponding author: ZHANG Yu-Hu,

Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou 730000,China2 China Institute of Atomic Energy,Beijing 102413,China3 Japan Atomic Energy Research Institute,Tokai,Ibaraki 319-1195,Japan4 Chiba University,Inage-ku,Chiba 263-8512,Japan5 Chiba Institute of Technology,Narashino,Chiba 275-0023,Japan6 Institute of Physics and Tandem Accelerator Center,University of Tsukuba,Ibaraki 305-0006,Japan

Received Date: 1900-01-01

Accepted Date: 1900-01-01

Available Online: 2000-07-15

Abstract:

In recent years,high-spin states in a series of deformed odd-odd nuclei ¹⁶²Lu,¹⁷⁰Ta,¹⁷⁴Re,^176,178,180Ir and 182Au have been studied in corporation with the researchers in the IMP (Institute of Modem Physics,CAS),CIAE (China Institute of Atomic Energy) and JAERI (Japan Atomic Energy Research Institute).The experimental results are reviewed in this report.The interesting phenomenon of low-spin signature inversion in both the πh_11/2⊙νi_13/2 and πh_9/2⊙νi_13/2 configurations has been systematically studied and discussed for the nuclei in this mass region.A possible lowspin signature inversion is suggested for the πh_13/2⊙νi_13/2 structure in ^182,184Au and the limited experimental data seem to support such suggestion.The gradual alignment gains with rotation are reported ,for the first time,in the πh_11/2⊙νi_13/2 bands of odd-odd ^178,180Ir.An unexpected smaller band crossing frequency is observed in ¹⁷⁸Ir(most probably in the πd_5/2⊙νh_9/2 configuration).These anomalies may be associated with the configuration-dependent deformations and/or neutron pairing.

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Experimental Study of High-spin States in Odd-Odd Nuclei around 160-180 Mass Region

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