General Chaotic Behaviors of Heavy ion Collisions at Intermediate Energy Based on Dynamical Transport Model

TL;DR

This study investigates the chaotic behaviors in heavy ion collisions at intermediate energies using a dynamical transport model, revealing evidence of nonlinear chaos and phase transition characteristics, especially near 100 MeV incident energy.

Contribution

It systematically analyzes nonlinear dynamical behaviors and chaos in heavy ion collisions, providing new insights into phase transition mechanisms at intermediate energies.

Findings

Confirmation of nonlinear chaos in heavy ion collisions.

Identification of clearer phase transition signals near 100 MeV.

Analysis of multifragmentation entropy and fractal structures.

Abstract

Motivated to explore the dynamical mechanism of multi-fragmentation phase transition and expand our knowledge on the deterministic chaos in nonlinear dynamic process, we study systematically the nonlinear dynamical behaviors of heavy ion collisions at intermediate energy. In order to highlight the general characteristics of the collision dynamics, in the present paper, we simulate a simple collision system, $Ca+Ca$, and obverse the performances of the typical nonlinear characteristic quantities such as the production of generalized entropy and the fractal structure of the semiclassical phase space during the reaction process. The multifragmentation entropy, information dimension and the dynamical fluctuations of fragment mass distribution in the final state of the reaction are also evaluated. Our results about the intermediate processes and the final products of the reaction are verified mutually so that confirm strongly the existence of nonlinear chaos in the heavy ion collisions at intermediate energy. Meanwhile, we find that the typical characteristics of the critical phase transition obtained in the analysis of the final production of the reaction are relatively more clear in the vicinity of the incident energies $E=100 MeV$.