On the spreading width of the Isobaric Analog Resonances

TL;DR

This paper presents a combined theoretical approach to quantitatively estimate the spreading width of Isobaric Analog Resonances in medium-heavy nuclei, specifically in lead isotopes, without adjustable parameters.

Contribution

It introduces a novel method combining Coulomb description with a particle-hole dispersive optical model for accurate width estimation.

Findings

Successfully estimates resonance widths in 208,209Pb

Provides a parameter-free quantitative approach

Enhances understanding of isospin-forbidden processes

Abstract

A description of the spreading width of the Isobaric Analog Resonances in medium-heavy mass spherical nuclei is proposed within a combined approach. This latter consists in incorporating the "Coulomb description" of isospin-forbidden processes into the newly developed particle-hole dispersive optical model. Within this approach, the observed spreading width of the resonances based on the 208,209Pb parent-nuclei ground state is quantitatively estimated without the use of specific adjustable parameters.