Probing chemical freeze-out criteria in relativistic nuclear collisions with coarse grained transport simulations

  • We introduce a novel approach based on elas- tic 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 sev- eral decay and re-formation chains involving resonances and taking into account inelastic, pseudo-elastic and string excita- tion 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 micro- scopic dynamical simulation, that the chemical freeze-out at all energies coincides with ⟨E⟩/⟨N⟩ ≈ 1 GeV, while other criteria, like s/T 3 = 7 and nB +nB ̄ ≈ 0.12 fm−3 are limited to higher collision energies.

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Author:Tom Andre ReichertORCiDGND, Gabriele InghiramiORCiDGND, Marcus BleicherORCiDGND
Parent Title (English):The European physical journal. A
Place of publication:Berlin ; Heidelberg
Document Type:Article
Date of Publication (online):2020/10/20
Date of first Publication:2020/10/20
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2023/03/21
Issue:10, art. 267
Article Number:267
Page Number:9
First Page:1
Last Page:9
This work was supported by Deutscher Akademischer Austauschdienst (DAAD), Helmholtz Forschungsakademie Hessen (HFHF) and in the framework of COST Action CA15213 (THOR). Funding Open Access funding enabled and organized by Projekt DEAL.
Wissenschaftliche Zentren und koordinierte Programme / Helmholtz International Center for FAIR
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International