Microscopic theory of the \gamma -decay of nuclear giant resonances

TL;DR

This paper develops a microscopic, Skyrme-based model for gamma decay of nuclear giant resonances, enabling more accurate predictions aligned with experimental data and suitable for exotic beam studies.

Contribution

It introduces a fully self-consistent Skyrme interaction-based framework for gamma decay, including decay to low-lying states beyond RPA, which is novel in this context.

Findings

Model successfully applied to 208Pb and 90Zr.

Results show good agreement with experimental data.

Provides a foundation for future studies with exotic nuclei.

Abstract

In the past decades, the \gamma-decay of giant resonances has been studied using phenomenological models. In keeping with possible future studies performed with exotic beams, microscopically-based frameworks should be envisaged. In the present paper, we introduce a model which is entirely based on Skyrme effective interactions, and treats the ground-state decay within the fully self-consistent Random Phase Approximation (RPA) and the decay to low-lying states at the lowest order beyond RPA. The model is applied to 208Pb and 90Zr, and the results are compared with experimental data.