A1 Journal article (refereed)
Probing chemical freeze-out criteria in relativistic nuclear collisions with coarse grained transport simulations (2020)

Reichert, T., Inghirami, G., & Bleicher, M. (2020). Probing chemical freeze-out criteria in relativistic nuclear collisions with coarse grained transport simulations. European Physical Journal A, 56(10), Article 267. https://doi.org/10.1140/epja/s10050-020-00273-y

JYU authors or editors

Publication details

All authors or editors: Reichert, Tom; Inghirami, Gabriele; Bleicher, Marcus

Journal or series: European Physical Journal A

ISSN: 1434-6001

eISSN: 1434-601X

Publication year: 2020

Volume: 56

Issue number: 10

Article number: 267

Publisher: Springer

Publication country: Germany

Publication language: English

DOI: https://doi.org/10.1140/epja/s10050-020-00273-y

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/72330

Web address of parallel published publication (pre-print): https://arxiv.org/abs/2007.06440

Abstract

We introduce a novel approach based on elastic and inelastic scattering rates to extract the hyper-surface of the chemical freeze-out from a hadronic transport model in the energy range from Elab = 1.23 AGeV to √sNN = 62.4 GeV. For this study, the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) model combined with a coarse-graining method is employed. The chemical freeze-out distribution is reconstructed from the pions through several decay and re-formation chains involving resonances and taking into account inelastic, pseudo-elastic and string excitation reactions. The extracted average temperature and baryon chemical potential are then compared to statistical model analysis. Finally we investigate various freeze-out criteria suggested in the literature. We confirm within this microscopic dynamical simulation, that the chemical freeze-out at all energies coincides with ⟨E⟩/⟨N⟩ ≈1 GeV, while other criteria, like s/T3 = 7 and nB+nB¯ ≈ 0.12 fm−3 are limited to higher collision energies.

Keywords: nuclear physics; particle physics

Free keywords: relativistic nuclear collisions

Contributing organizations

Related projects

Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 1