Searching for statistical equilibrium in a dynamical multifragmentation path

TL;DR

This paper extends a method for detecting statistical equilibrium in dynamical multifragmentation paths to higher energy reactions, revealing significant phase space occupation and specific equilibration parameters despite collective flow effects.

Contribution

It applies and validates a previously tested equilibrium detection method at higher energy, providing new insights into the equilibration process in nuclear reactions.

Findings

High phase space occupation at 50 MeV/u

Identified specific equilibration time and volume

Differences between reactions at different energies

Abstract

A method for identifying statistical equilibrium stages in dynamical multifragmentation paths as provided by transport models, already successfully tested for for the reaction ^{129}Xe+^{119}Sn at 32 MeV/u is applied here to a higher energy reaction, ^{129}Xe+^{119}Sn at 50 MeV/u. The method evaluates equilibrium from the point of view of the microcanonical multifragmentation model (MMM) and reactions are simulated by means of the stochastic mean field model (SMF). A unique solution, corresponding to the maximum population of the system phase space, was identified suggesting that a huge part of the available phase space is occupied even in the case of the 50 MeV/u reaction, in presence of a considerable amount of radial collective flow. The specific equilibration time and volume are identified and differences between the two systems are discussed.