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arXiv 1802.08866nucl-thnucl-ex
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$^{36,40}$ Ar超形变带的背弯

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

Xu-Hui Xiang, Xiao-Tao He

摘要:

采用曲柄壳模型(CSM)研究了实验观察到的$^{36}$ Ar和$^{40}$ Ar的超形变(SD)转动带,并采用粒子数守恒(PNC)方法处理配对关联。这是首次在$A=40$周围的轻核质量区进行PNC-CSM计算。实验的运动学惯性矩$J^{(1)}$与旋转频率的再现良好。在$^{36}$ Ar中,在$\hbarω=1.5$ MeV附近频率处的SD带的回弯归因于中子和质子$1d_{5/2}[202]5/2$对和$1f_{7/2}[321]3/2$对的同时对准的急剧上升,这是$1d_{5/2}[202]5/2$和$1f_{7/2}[321]3/2$配置状态之间的带交叉的结果。$^{40}$ Ar中SD带低频处的轻微上弯主要受中子$1f_{7/2}[321]3/2$对和质子$1d_{5/2}[202]5/2$对的排列影响。PNC-CSM计算表明,除了对角部分外,非对角部分的排列对SD带的转动行为起着重要的作用。

英文摘要:

Experimentally observed superdeformed (SD) rotational bands in $^{36}$Ar and $^{40}$Ar are studied by the cranked shell model (CSM) with the paring correlations treated by a particle-number-conserving (PNC) method. This is the first time the PNC-CSM calculations are 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 $\hbarω=1.5$ MeV in $^{36}$Ar 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 the 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 the low frequency of the SD band in $^{40}$Ar is mainly effected 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.

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