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arXiv 1209.6074nucl-th
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N=28同位素形状演化的能量密度泛函分析

Energy Density Functional analysis of shape evolution in N=28 isotones

Z. P. Li, J. M. Yao, D. Vretenar, T. Niksic, H. Chen, J. Meng

摘要:

基于相对论能量密度泛函DD-PC 1,利用结构模型分析了缺质子N=28同位素的低能集体态结构。本文用三轴核的相对论性Hartree-Bogoliubov模型计算了$β$ - $γ$平面的结合能图。中子和质子单粒子水平与四极形变的演变,以及费米表面周围的间隙的发生,提供了一个简单的变形和形状共存的发病微观解释。从用DD-PC 1泛函计算的自洽约束能面出发,采用四极振动和转动的集体哈密顿量分析了$^{46}$ Ar,$^{44}$ S和$^{42}$ Si的激发光谱和跃迁速率.结果进行比较,现有的数据,和以前的研究的基础上的平均场的方法或大规模的壳模型计算。本研究特别关注$^{44}$ S,最近报道的数据表明明显的形状共存。

英文摘要:

The structure of low-energy collective states in proton-deficient N=28 isotones is analyzed using structure models based on the relativistic energy density functional DD-PC1. The relativistic Hartree-Bogoliubov model for triaxial nuclei is used to calculate binding energy maps in the $β$-$γ$ plane. The evolution of neutron and proton single-particle levels with quadrupole deformation, and the occurrence of gaps around the Fermi surface, provide a simple microscopic interpretation of the onset of deformation and shape coexistence. Starting from self-consistent constrained energy surfaces calculated with the functional DD-PC1, a collective Hamiltonian for quadrupole vibrations and rotations is employed in the analysis of excitation spectra and transition rates of $^{46}$Ar, $^{44}$S, and $^{42}$Si. The results are compared to available data, and previous studies based either on the mean-field approach or large-scale shell-model calculations. The present study is particularly focused on $^{44}$S, for which data have recently been reported that indicate pronounced shape coexistence.

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