Bayesian Inference of the Landau Parameter $G'_0$ from Joint Gamow-Teller Measurements

TL;DR

This paper uses Bayesian inference with experimental Gamow-Teller resonance data to accurately determine the Landau-Migdal parameter $G'_0$, which influences nuclear interactions and astrophysical phenomena.

Contribution

First Bayesian estimation of $G'_0$ with quantified uncertainty using joint experimental constraints and a self-consistent Skyrme RPA model.

Findings

Estimated $G'_0$ is 0.48 ± 0.034.

Result is close to some Skyrme model predictions.

Values differ from traditional pion-exchange model estimates.

Abstract

The Landau-Migdal parameter $G'_0$ characterizes the main part of the spin-isospin dependent nucleon-nucleon interaction. Consequently, the $G'_0$ is closely related to the Gamow-Teller resonance (GTR), the beta and double-beta decay rates of finite nuclei, the response of hot and dense nucleonic matter that modifies the neutrino-nucleon absorption rates in core-collapse supernovae (CCSNe) and binary neutron star (BNS) mergers, and finally the critical density for pion condensation in neutron stars. In this letter, for the first time, we report the $G'_0$ with quantified uncertainty in the framework of Bayesian inference, using a self-consistent standard Skyrme Random Phase Approximation (RPA) model and joint constraints from experimental GTR measurements on $^{208}\mathrm{Pb}$, $^{132}\mathrm{Sn}$, $^{90}\mathrm{Zr}$. Our extracted $G_0'$ is $0.48\pm0.034$, which is close to the prediction of a few existing Skyrme models that consider spin-isospin observables but smaller than the traditional ones extracted from pion-exchange models. We hint to possible reasons for this deviation, like the value of the nucleon effective mass $\frac{m^*}{m}$. The $G_0'$ values extracted in this work may guide the construction of new energy density functionals that aims to self-consistently describe the dense matter properties in the spin-isospin channel.