Backbendings of Superdeformed bands in $^{36,40}$Ar - INSPIRE

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Backbendings of Superdeformed bands in $^{36,40}$ Ar

Feb 24, 2018

6 pages

Published in:

Chin.Phys.C 42 (2018) 5, 054105

Published: May 8, 2018

e-Print:

1802.08866 [nucl-th]

DOI:

10.1088/1674-1137/42/5/054105

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Abstract: (IOP)

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 ℏω=1.5 MeV in 36Ar is attributed to the sharp rise of the simultaneous alignments of the neutron and proton 1d 5/2[202]5/2 pairs and 1f 7/2[321]3/2 pairs, which is a consequence of the band crossing between the 1d 5/2[202]5/2 and 1f 7/2[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 1f 7/2[321]3/2 pairs and proton 1d 5/2[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.

21.10.Re
21.60.Cs
23.20.Lv
superdeformed band
backbending
moment of inertia
cranked shell model

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