Chemical and Thermal Freeze-Out Parameters from 1 to 200 A.GeV

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Abstract

The present knowledge about hadrons produced in relativistic heavy ion collisions is compatible with chemical freeze-out happening when the energy density divided by the particle density reaches the value of 1 GeV. This observation is used to determine the energy dependence of the chemical freeze-out parameters T_{ch} and mu_B^{ch} for beam energies varying between 1 and 200 A.GeV. The consequences of this energy dependence are studied for various particle ratios. Predictions for particle ratios at beam energy 40 A.GeV are presented. The conditions for thermal freeze-out are also determined. These correspond either to an energy density of 45 MeV/fm**3 or to a particle density of 0.05/fm**3.

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Influence of Impact Parameter on Thermal Description of Relativistic Heavy Ion Collisions at GSI/SIS

K. Redlich, H. Oeschler, J. Cleymans (1998)

Attention is drawn to the role played by the size of the system in the thermodynamic analysis of particle yields in relativistic heavy ion collisions at SIS energies. This manifests itself in the non-linear dependence of K+ and K- yields in

$AA$ collisions at 1 -- 2 A.GeV on the number of participants. It is shown that this dependence can be quantitatively well described in terms of a thermal model with a canonical strangeness conservation. The measured particle multiplicity ratios (pi+/p, pi-/pi+, d/p, K+/pi+ and K+/K- but not eta/pi0) in central Au-Au and Ni-Ni collisions at 0.8 -- 2.0 A.GeV are also explained in the context of a thermal model with a common freeze-out temperature and chemical potential. Including the concept of collective flow a consistent picture of particle energy distributions is derived with the flow velocity being strongly impact-parameter dependent.

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Determination of temperature and transverse flow velocity at chemical freeze-out in relativistic nuclear interactions

A. Panagiotou, G. Mavromanolakis, J. Tzoulis (1996)

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Author and article information

Journal

Publication date Created: 1999-03-28

Publication date Updated: 1999-07-20

Article

DOI: 10.1103/PhysRevC.60.054908

ArXiV ID: nucl-th/9903063

SO-VID: 6cf3b54c-0f45-483d-8f1e-304903c43c9d

History

Custom metadata

Journal reference Phys.Rev. C60 (1999) 054908

Comments RevTeX 10 pages, 10 Postscript figures

Categories nucl-th hep-ph

ScienceOpen disciplines: High energy & Particle physics,Nuclear physics

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ScienceOpen disciplines: High energy & Particle physics, Nuclear physics

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