Nuclear Equation of State and many-body phase-space correlations in the Constrained Molecular Dynamics

TL;DR

This paper investigates many-body correlations in the Constrained Molecular Dynamics model, examining their impact on the nuclear equation of state and reaction mechanisms in heavy ion collisions, with comparisons to mean-field predictions.

Contribution

It introduces a method to correct effective interaction parameters in CoMD to accurately reproduce the nuclear equation of state, considering correlation effects.

Findings

Differences between CoMD and mean-field EoS due to correlations.

Correlation effects influence reaction mechanisms in heavy ion collisions.

Corrections to interaction parameters improve EoS reproduction in CoMD.

Abstract

Many-body correlations characterizing the Constrained Molecular Dynamics (CoMD)are analyzed in the case of finite and zero range effective microscopic interactions. The study begins by analyzing the case of infinite nuclear matter at zero temperature. A comparison with the predictions in the mean-field(MF) limit corresponding to different effective masses, highlights non-negligible differences regarding the produced Equation of State (EoS). A procedure is illustrated to determine the necessary corrections of the effective interaction parameters in the CoMD model so to reproduce the chosen EoS. The specific model calculations, the general feature of the discussed correlations gives a wider meaning to the resulting differences, which are in fact strongly related both to the Pauli principle constraint and to the localization effects related to wave-packets dynamics. Moving on to finite systems, preliminary results are shown in relation to the reaction mechanisms in the $^{64}Ni+^{48}Ca$ system described by the CoMD model. Therefore, the topic covered illustrates the effects produced by the correlations of the CoMD dynamics on the EoS and on some observables commonly studied in heavy ion collisions.