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Affiliation of Author(s):材料科学与技术学院

Journal:CHINESE PHYSICS C

Key Words:superdeformed band backbending moment of inertia cranked shell model

Abstract:Experimentally observed superdeformed (SD) rotational bands in Ar-36 and Ar-40 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 omega = 1.5 MeV in (36) Ar is attributed to the sharp rise of the simultaneous alignments of the neutron and proton ld(5/2)[202]5/2 pairs and lf(tau/2)[321]3/2 pairs, which is a consequence of the band crossing between the id(5/2) [202]5/2 and If(tau/2)[321]3/2 configuration states. The gentle upbending at low frequency of the SD band in (40) Ar is mainly affected by the alignments of the neutron If(tau/2)[321]/2 pairs and proton ld(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.

ISSN No.:1674-1137

Translation or Not:no

Date of Publication:2018-05-01

Co-author:Xiang, Xu-Hui

Correspondence Author:hxt