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arXiv 0706.3497nucl-th
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密度相关相对论Hartree-Fock理论中的壳结构和$ρ$ -张量关联

Shell Structure and $ρ$-Tensor Correlations in Density-Dependent Relativistic Hartree-Fock theory

Wen Hui Long, Hiroyuki Sagawa, Nguyen Van Giai, Jie Meng

摘要:

提出了一种新的适用于密度相关相对论Hartree-Fock(DDRHF)理论的PKA 1与$ρ$ -张量耦合有效相互作用.它是通过拟合选定的经验基态和壳层结构性质得到的。它在与最近的DDRHF和RMF模型相同的定量水平上提供了对有限核的核物质和基态性质的满意描述。单粒子谱的显着改善也被发现,由于列入$ρ$张量耦合。结果,PKA 1治愈了现有DDRHF和RMF拉格朗日函数的一个共同的疾病,即在58和92处的人工壳,并在64处恢复了真实的子壳闭合。此外,新的有效相互作用PKA 1还得到了适当的自旋轨道分裂和赝自旋对称性守恒。由于$ρ$ -张量关联引入了额外的束缚,改变了核的引力和斥力之间的平衡,这是核壳层结构改善的物理原因.

英文摘要:

A new effective interaction PKA1 with $ρ$-tensor couplings for the density-dependent relativistic Hartree-Fock (DDRHF) theory is presented. It is obtained by fitting selected empirical ground state and shell structure properties. It provides satisfactory descriptions of nuclear matter and the ground state properties of finite nuclei at the same quantitative level as recent DDRHF and RMF models. Significant improvement on the single-particle spectra is also found due to the inclusion of $ρ$-tensor couplings. As a result, PKA1 cures a common disease of the existing DDRHF and RMF Lagrangians, namely the artificial shells at 58 and 92, and recovers the realistic sub-shell closure at 64. Moreover, the proper spin-orbit splittings and well-conserved pseudo-spin symmetry are obtained with the new effective interaction PKA1. Due to the extra binding introduced by the $ρ$-tensor correlations, the balance between the nuclear attractions and the repulsions is changed and this constitutes the physical reason for the improvement of the nuclear shell structure.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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