Varying shell gap and deformation inN∼20unstable nuclei studied by the Monte Carlo shell model
Varying shell gap and deformation inN∼20unstable nuclei studied by the Monte Carlo shell model
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DOI：
10.1103/physrevc.60.054315
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发表时间：
1999-10
影响因子：
3.1
通讯作者：
Y. Utsuno;T. Otsuka;T. Mizusaki;M. Honma
中科院分区：
文献类型：
--
作者：
Y. Utsuno;T. Otsuka;T. Mizusaki;M. Honma
采用基于量子MonteCarlo对角化方法的MonteCarlo壳模型，研究了$N\ensuremath{\sim}20$区丰中子核的结构.我们提出了一个全面的描述的偶-偶同位素的O，Ne，Mg和Si。结果表明，对于不同的核，从$sd $到$pf $壳层的各种粒子-空穴激发以不同的方式混合，有时会产生不同的效应，例如在$28 Ne中.研究并修正了壳层间的相互作用，导致壳层间隙从核到核发生变化。然后复制O同位素的滴线。从势能面和有效单粒子能量的角度讨论了T=0和T=1相互作用之间的相互作用。解释了Ne同位素中子滴线的延伸，并表明“反转岛”的边界相当模糊。
The structure of neutron-rich nuclei in the $N\ensuremath{\sim}20$ region is studied by the Monte Carlo shell model based on the quantum Monte Carlo diagonalization method. We present a comprehensive description of even-even isotopes of O, Ne, Mg, and Si. It is demonstrated that, for different nuclei, various particle-hole excitations from the $\mathrm{sd}$ to $\mathrm{pf}$ shell are mixed in different ways, producing distinct effects sometimes, for instance, in ${}^{28}\mathrm{Ne}.$ The monopole interaction is examined and modified, resulting in the shell gap changing from nucleus to nucleus. The drip line of O isotopes is then reproduced. The interplay between the $T=0$ and $T=1$ monopole interactions is discussed from the viewpoint of the potential energy surface and the effective single-particle energy. The extension of the neutron drip line of Ne isotopes is explained, and the boundary of the ``island of inversion'' is shown to be rather indistinct.