• Accepted Paper

Bayesian inference of the Landau parameter G′0 from joint Gamow-Teller measurements

Zidu Lin, Gianluca Colò, Andrew W. Steiner, and Amber Stinson

Phys. Rev. Lett. - Accepted 2 November, 2026

DOI: https://doi.org/10.1103/kn6h-dkxb

Abstract

G′0 is the leading-order Landau-Migdal parameter that characterizes 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 208Pb, 132Sn, 90Zr. Our extracted G0′ at saturation density is 0.48±0.034, 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. The reasons for this deviation, like the value of the nucleon effective mass m*m and the density dependence of G′0, are investigated. The density-dependent G0′ 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.

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