"Soft" interaction parameters setting in the extended quantum molecular dynamics model

TL;DR

This paper develops a method to implement a softer equation of state in the extended quantum molecular dynamics model, improving agreement with experimental data on nuclear resonances by adjusting interaction parameters.

Contribution

It introduces a new approach to set softer interaction parameters in the EQMD model using Skyrme energy density functionals, enhancing its predictive capability.

Findings

The new soft interaction in EQMD matches experimental ISGMR data.

Using SkP parameters yields better agreement with heavy ion collision data.

The approach broadens the applicability of EQMD to deformed nuclei and nuclear reactions.

Abstract

The extended quantum molecular dynamics (EQMD) model is one of the few quantum molecular dynamics (QMD)-like transport approaches that can be used to study the effective clustering structure as well as heavily deformed nuclei in both ground state nuclei and nuclear reactions. However, there are only two parameter sets that lead to hard incompressibility for long times. The aim of the present work is to obtain a soft equation of state (EoS) in the EQMD model. In this context, we take the isoscalar giant monopole resonance (ISGMR), which is sensitive to the EoS, as an example to check our work. By introducing a kind of standard Skyrme energy density functional with different parameter sets, such as SkP, SkT1, and SKXce, whose incompressibility value ranges from 200 to 268 MeV, the ISGMR of $^{208}$Pb and other nuclei are studied. When the SkP parameter sets are adopted, our new soft interaction in the EQMD model gives reasonable agreement with the experimental data in the heavy ion regime.