Application of an Extended Random Phase Approximation on Giant Resonances in Light, Medium and Heavy Mass Nuclei

TL;DR

This paper extends the random-phase approximation with the time blocking approximation to better model giant resonances across various nuclei, incorporating complex configurations and a new continuum handling method.

Contribution

It introduces a self-consistent extension of RPA called TBA with a novel continuum treatment, applied to diverse nuclei using Skyrme functionals.

Findings

Results agree well with experimental data.

Dependence on model parameters is systematically analyzed.

The method improves the description of giant resonances.

Abstract

We present results of the time blocking approximation (TBA) on giant resonances in light, medium and heavy mass nuclei. The TBA is an extension of the widely used random-phase approximation (RPA) adding complex configurations by coupling to phonon excitations. A new method for handling the single-particle continuum is developed and applied in the present calculations. We investigate in detail the dependence of the numerical results on the size of the single particle space and the number of phonons as well as on nuclear matter properties. Our approach is self-consistent, based on an energy-density functional of Skyrme type where we used seven different parameter sets. The numerical results are compared with experimental data.