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arXiv 1012.3794nucl-th
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$^{20}$ Ne和$^{24}$ Mg中团簇-壳层竞争的简化模型

Simplified modeling of cluster-shell competition in $^{20}$Ne and $^{24}$Mg

N. Itagaki, J. Cseh, M. Płoszajczak

摘要:

我们研究了在反对称准团簇(AQC)集体基上的生成坐标方法(GCM)的性质,用来描述$^{20}$ Ne和$^{24}$ Mg中由于自旋轨道相互作用引起的团簇-壳层竞争.通过在反对称团簇基函数中引入一个单独的附加参数,可以描述从$α$团簇到独立核子的连续变换。我们利用GCM试探波函数详细研究了从团簇态$[ ^{16}$ O+ $α]$和$[ ^{16}$ O+ $α+ α]$分别到壳模型态$[ ^{16}$ O+ ${\rm 4N} ]$和$[ ^{16}$ O+ ${\rm 8N} ]$的跃迁.通过再现$^{20}$ Ne中的能级间距,导出了自旋-轨道相互作用强度的最佳值。一个可能的连接到集团理论的理解集群壳层配置过渡进行了讨论。

英文摘要:

We investigate properties of the Generator Coordinate Method (GCM) on a collective basis of Antisymmetrized Quasi-Cluster (AQC) states to describe the cluster-shell competition in $^{20}$Ne and $^{24}$Mg due to the spin-orbit interaction. By introducing a single additional parameter in the antisymmetrized-cluster basis function, a continuous transformation of the $α$ cluster(s) into independent nucleons can be described. We apply this GCM trial wave function to study in details the transition from cluster states $[ ^{16}$O+$α]$ and $[ ^{16}$O+$α+ α]$ to shell model (SM) states $[ ^{16}$O+${\rm 4N} ]$ and $[ ^{16}$O+${\rm 8N} ]$, respectively. An optimal value of the strength of the spin-orbit interaction is deduced by reproducing level spacing in $^{20}$Ne. A possible connection to the group theoretical understanding of the cluster-shell configuration transition is also discussed.

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