Nuclear effective charge factor originating from covariant density functional theory
Nuclear effective charge factor originating from covariant density functional theory
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DOI：
10.1103/physrevc.87.037301
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发表时间：
2013-03
影响因子：
3.1
通讯作者：
Z. Niu;Q. Liu;Y. Niu;W. Long;J. Y. Guo
中科院分区：
文献类型：
--
作者：
Z. Niu;Q. Liu;Y. Niu;W. Long;J. Y. Guo
在相对论局域密度近似的指导下，我们探讨了库仑场耦合强度的现象学公式，以便在相对论Hartree近似中有效地考虑库仑交换项。通过与相对论Hartree-Fock-Bogoliubov方法中库仑交换能的精确处理比较，检验了它对有限核的有效性。结果发现，对于半虚Ca、Ni、Sn和Pb同位素，采用唯象公式可以再现精确的库仑交换能，相对偏差小于1%。此外，我们检查的有效相互作用的相对论Hartree方法的唯象公式的适用性，通过调查的结合能差的镜像核。
Guidedbytherelativisticlocaldensityapproximation,weexploreaphenomenologicalformulaforthecoupling strength of the Coulomb field to effectively take into account the Coulomb exchange term in the relativistic Hartree approximation. Its validity for finite nuclei is examined by comparing with the exact treatment of the Coulomb exchange energies in the relativistic Hartree-Fock-Bogoliubov approach. It is found that the exact Coulomb exchange energies can be reproduced by employing the phenomenological formula with the relative deviations less than 1% for semimagic Ca, Ni, Sn, and Pb isotopes. Furthermore, we check the applicability of the phenomenological formula for the effective interactions in the relativistic Hartree approach by investigating the binding-energy differences of mirror nuclei.