Gamow-Teller response and its spreading mechanism in doubly magic nuclei

TL;DR

This paper uses a sophisticated beyond mean-field model to analyze the Gamow-Teller response in doubly magic nuclei, revealing the fragmentation mechanism and comparing results with experimental data.

Contribution

It applies a fully self-consistent Skyrme Hartree-Fock plus RPA model to study Gamow-Teller responses, including the coupling and fragmentation mechanisms in doubly magic nuclei.

Findings

Model successfully reproduces experimental Gamow-Teller strength distributions.

Coupling between particles and vibrations causes resonance fragmentation.

Results provide insights into the microscopic mechanisms of the response.

Abstract

The scope of the paper is to apply a state-of-the-art beyond mean-field model to the description of the Gamow-Teller response in atomic nuclei. This topic recently attracted considerable renewed interest, due, in particular, to the possibility of performing experiments in unstable nuclei. We study the cases of $^{48}$Ca, $^{78}$Ni, $^{132}$Sn and $^{208}$Pb. Our model is based on a fully self-consistent Skyrme Hartree-Fock plus random phase approximation. The same Skyrme interaction is used to calculate the coupling between particles and vibrations, which leads to the mixing of the Gamow-Teller resonance with a set of doorway states and to its fragmentation. We compare our results with available experimental data. The microscopic coupling mechanism is also discussed in some detail.