Comparison of Gamow-Teller strengths in the random phase approximation

TL;DR

This paper compares Gamow-Teller strength distributions across various nuclides and interactions using RPA methods, highlighting theoretical uncertainties and benchmarking against experimental data for iron-54.

Contribution

It provides a systematic comparison of Gamow-Teller strengths using different RPA approaches and interactions, improving understanding of theoretical systematics and uncertainties.

Findings

RPA effectively generates strength distributions for multiple nuclides.

Comparison reveals differences between semi-realistic and separable interactions.

Experimental data for 54Fe helps validate the theoretical models.

Abstract

The Gamow-Teller response is astrophysically important for a number of nuclides, particularly around iron. The random phase approximation (RPA) is an efficient way to generate strength distributions. In order to better understand both theoretical systematics and uncertainties, we compare the Gamow-Teller strength distributions for a suite of nuclides and for a suite of interactions, including semi-realistic interactions in the $1p$-$0f$ space with the RPA and a separable multi-shell interaction in the quasi-particle RPA. We also compare with experimental results for GT$_-$ on ${54}$Fe.