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arXiv 1909.07171nucl-th
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对角近似下巨共振的粒子-振动耦合

Particle-vibration coupling for giant resonances beyond the diagonal approximation

Shihang Shen, Gianluca Colò, Xavier Roca-Maza

摘要:

提出了一种无需对角近似的自洽粒子-振动耦合(PVC)模型。对角近似,完全忽略了门口状态之间的相互作用,已被删除,考虑到门口状态内的两个粒子之间的相互作用孔。作为应用,我们利用Skyrme泛函研究了16 O中的等振巨共振、偶极共振和四极共振.发现对角近似对巨四极共振的强度分布有明显的影响,在没有对角近似的情况下,实验数据的描述得到了改善。详细分析了对角近似的影响,特别是对角近似对本征能和中子、质子粒子-空穴组态之间的诱导耦合的影响。后者是形式主义改进的一个直接的、实实在在的效果。本文还讨论了在PVC顶点采用自洽的全有效相互作用的重要性,以及通过减法进行重整化的效果。为了完整性,我们还分析了我们的结果对Skyrme参数化的依赖。

英文摘要:

A self-consistent particle-vibration coupling (PVC) model without diagonal approximation is presented. The diagonal approximation, that neglects completely the interaction between the doorway states, has been removed by taking into account the interaction between the two particle-holes inside the doorway states. As applications, isoscalar giant monopole, dipole, and quadrupole resonances in 16O are investigated based on the use of Skyrme functionals. The diagonal approximation is found to clearly impact the strength distribution of the giant quadrupole resonance, and the description of the experimental data is improved without this approximation. The impact of the diagonal approximation is analyzed in detail, especially its effect on the eigenenergies and the induced coupling between neutron and proton particle-hole configurations. The latter is a direct and physically sound effect of the improvement on our formalism. The importance of using self-consistently the full effective interaction in the PVC vertex, and the effect of its renormalization via the subtraction method, are also discussed. For completeness, we also analyze the dependence of our results on the Skyrme parametrization.

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