Backbendings of superdeformed bands in 36,40Ar

  • Experimentally observed superdeformed (SD) rotational bands in 36Ar and 40Ar are studied by the cranked shell model (CSM) with the pairing correlations treated by a particle-number-conserving (PNC) method. This is the first time that PNC-CSM calculations have been performed on the light nuclear mass region around A=40. The experimental kinematic moments of inertia J(1) versus rotational frequency are reproduced well. The backbending of the SD band at frequency around =1.5 MeV in 36Ar is attributed to the sharp rise of the simultaneous alignments of the neutron and proton 1d5/2[202]5/2 pairs and 1f7/2[321]3/2 pairs, which is a consequence of the band crossing between the 1d5/2[202]5/2 and 1f7/2[321]3/2 configuration states. The gentle upbending at low frequency of the SD band in 40Ar is mainly affected by the alignments of the neutron 1f7/2[321]3/2 pairs and proton 1d5/2[202]5/2 pairs. The PNC-CSM calculations show that besides the diagonal parts, the off-diagonal parts of the alignments play an important role in the rotational behavior of the SD bands.
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Xu-Hui Xiang and Xiao-Tao He. Backbendings of superdeformed bands in 36,40Ar[J]. Chinese Physics C, 2018, 42(5): 054105. doi: 10.1088/1674-1137/42/5/054105
Xu-Hui Xiang and Xiao-Tao He. Backbendings of superdeformed bands in 36,40Ar[J]. Chinese Physics C, 2018, 42(5): 054105.  doi: 10.1088/1674-1137/42/5/054105 shu
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Received: 2018-02-23
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    Supported by National Natural Science Foundation of China (11775112 and 11275098) and the Priority Academic Program Development of Jiangsu Higher Education Institutions

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Backbendings of superdeformed bands in 36,40Ar

    Corresponding author: Xiao-Tao He,
  • 1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Fund Project:  Supported by National Natural Science Foundation of China (11775112 and 11275098) and the Priority Academic Program Development of Jiangsu Higher Education Institutions

Abstract: Experimentally observed superdeformed (SD) rotational bands in 36Ar and 40Ar are studied by the cranked shell model (CSM) with the pairing correlations treated by a particle-number-conserving (PNC) method. This is the first time that PNC-CSM calculations have been performed on the light nuclear mass region around A=40. The experimental kinematic moments of inertia J(1) versus rotational frequency are reproduced well. The backbending of the SD band at frequency around =1.5 MeV in 36Ar is attributed to the sharp rise of the simultaneous alignments of the neutron and proton 1d5/2[202]5/2 pairs and 1f7/2[321]3/2 pairs, which is a consequence of the band crossing between the 1d5/2[202]5/2 and 1f7/2[321]3/2 configuration states. The gentle upbending at low frequency of the SD band in 40Ar is mainly affected by the alignments of the neutron 1f7/2[321]3/2 pairs and proton 1d5/2[202]5/2 pairs. The PNC-CSM calculations show that besides the diagonal parts, the off-diagonal parts of the alignments play an important role in the rotational behavior of the SD bands.

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