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

  • 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 πh11/2⊙νi13/2 and πh9/2⊙νi13/2 configurations has been systematically studied and discussed for the nuclei in this mass region.A possible lowspin signature inversion is suggested for the πh13/2⊙νi13/2 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 πh11/2⊙νi13/2 bands of odd-odd 178,180Ir.An unexpected smaller band crossing frequency is observed in 178Ir(most probably in the πd5/2⊙νh9/2 configuration).These anomalies may be associated with the configuration-dependent deformations and/or neutron pairing.

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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.
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. shu
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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

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 πh11/2⊙νi13/2 and πh9/2⊙νi13/2 configurations has been systematically studied and discussed for the nuclei in this mass region.A possible lowspin signature inversion is suggested for the πh13/2⊙νi13/2 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 πh11/2⊙νi13/2 bands of odd-odd 178,180Ir.An unexpected smaller band crossing frequency is observed in 178Ir(most probably in the πd5/2⊙νh9/2 configuration).These anomalies may be associated with the configuration-dependent deformations and/or neutron pairing.

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