One-body Langevin dynamics in heavy-ion collisions at intermediate energies

TL;DR

This paper introduces a novel Langevin dynamics framework for simulating dissipation and fluctuation effects in heavy-ion collisions at intermediate energies, effectively modeling nucleon interactions within viscous nuclear media.

Contribution

The paper presents a new Langevin-based approach to incorporate dissipation and fluctuation in heavy-ion collision simulations, integrating it with mean field dynamics for improved modeling.

Findings

Simulated Au + Au reactions consistent with existing codes.

Analyzed fragment formation in Sn + Sn reactions at 50 MeV/nucleon.

Results compared favorably with other collision models.

Abstract

We present a new framework to treat the dissipation and fluctuation dynamics associated with nucleon-nucleon scattering in heavy-ion collisions. The two-body collision processes are effectively described in terms of the diffusion of nucleons in viscous nuclear media, governed by a set of Langevin equations in momentum space. The new framework combined with the usual mean field dynamics can be used to simulate heavy-ion collisions at intermediate energies. As a proof of principle, we simulate Au + Au reactions and obtain results consistent with other existing codes under the same constrained conditions. We also study the formation of fragments in Sn + Sn reactions at 50 MeV/nucleon, and results are discussed and compared with two other models commonly employed for collisions.