Quenching factor of Gamow-Teller and spin dipole giant resonances

TL;DR

This study investigates the properties of Gamow-Teller and spin-dipole giant resonances in four doubly magic nuclei using self-consistent RPA calculations with Skyrme interactions, comparing results with experimental data.

Contribution

It provides a detailed analysis of GT and SD strength distributions using advanced Skyrme interactions, including tensor effects, and extracts quenching factors for these resonances.

Findings

RPA results agree well with experimental resonance energies.

Tensor interactions improve the description of low-lying GT peaks.

Quenching effects are more modest for SD peaks than for GT peaks.

Abstract

Gamow-Teller (GT) and spin-dipole (SD) strength distributions of four doubly magic nuclei $^{48}$Ca, $^{90}$Zr, $^{132}$Sn and $^{208}$Pb are studied by the self-consistent Hartree-Fock plus random phase approximation (RPA) method. The Skyrme forces SAMi and SAMi-T without/with tensor interactions are adopted in our calculations. The calculated strengths are compared with available experimental data. The RPA results of GT and SD strengths of all four nuclei show fine agreement with observed GT and SD resonances in energy. A small GT peak below the main GT resonance is better described by the Skyrme interaction SAMi-T with the tensor terms. The quenching factors for GT and SD are extracted from the comparisons between RPA results and experimental strengths. It is pointed out that the quenching effect on experimental SD peaks is somewhat modest compared with that on GT peaks in the four nuclei.