Impact of the in-medium cross section on cluster spectra in ^40,48Ca+^58,64Ni collisions at 56 and 140 MeV/nucleon

2025/12/11 by Chi Kin Tam, Tam, C. K., Chajecki, Z. +73
Physics and Astronomy · #Nuclear physics research studies #High-Energy Particle Collisions Research #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2512.10193

Abstract

Although significant efforts have been made to investigate the density dependence of the nuclear symmetry energy, the influence of the in-medium cross section on particle production in transport models is not well constrained. The in-medium cross section reflects the dynamic situation of the medium such as a nontrivial phase space distribution. In this study, we analyze the transverse momentum spectra of p, d, t, ³He and α particles emitted near mid-rapidity in central ^40,48Ca + ^{58, 64}Ni reactions at 56 and 140 MeV/nucleon. The Antisymmetrized Molecular Dynamics (AMD) model is chosen as the transport model for data comparison. Central events are selected based on charged-particle multiplicity in both the experimental data and AMD calculations after applying an experimental filter. Our results show that the in-medium nucleon-nucleon scattering cross-sections are more strongly reduced at 56 MeV/nucleon than at 140 MeV/nucleon incident energy.

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