Breathing mode in an improved transport approach

TL;DR

This paper introduces an improved relativistic BUU transport approach that enhances the stability of ground state nuclei, enabling more precise studies of nuclear breathing modes and their properties.

Contribution

The paper presents a novel numerical treatment that unifies the ground state and phase-space evolution using a semiclassical energy density functional, improving stability in BUU simulations.

Findings

Achieved very good stability of ground state nuclei in BUU simulations

Enabled clearer extraction of breathing-mode excitation energies

Improved lifetime measurements of nuclear giant monopole resonances

Abstract

The nuclear breathing-mode giant monopole resonance is studied within an improved relativistic Boltzmann-Uehling-Uhlenbeck (BUU) transport approach. As a new feature, the numerical treatment of ground state nuclei and their phase-space evolution is realized with the same semiclassical energy density functional. With this new method a very good stability of ground state nuclei in BUU simulations is achieved. This is important in extracting clear breathing-mode signals for the excitation energy and, in particular, for the lifetime from transport theoretical studies including mean-field and collisional effects.