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Title: Energy and system size dependence of chemical freeze-out in relativistic nuclear collisions

Abstract

We present a detailed study of chemical freeze-out in p-p, C-C, Si-Si, and Pb-Pb collisions at beam momenta of 158A GeV as well as Pb-Pb collisions at beam momenta of 20A, 30A, 40A, and 80A GeV. By analyzing hadronic multiplicities within the statistical hadronization model, we studied the parameters of the source as a function of the number of participating nucleons and the beam energy. We observe a nice smooth behavior of temperature, baryon chemical potential, and strangeness under-saturation parameter as a function of energy and nucleus size. Interpolating formulas are provided which allow us to predict the chemical freeze-out parameters in central collisions at center-of-mass energies {radical}(s){sub NN} > or approx. 4.5 GeV and for any colliding ions. Specific discrepancies between data and the model emerge in particle ratios in Pb-Pb collisions at beam energies between 20A and 40A GeV which cannot be accounted for in the considered model schemes.

Authors:
; ;  [1];  [2];  [3]
  1. Universita di Firenze and INFN Sezione di Firenze, Florence (Italy)
  2. (Finland)
  3. (Germany) and Swietokrzyska Academy, Kielce (Poland)
Publication Date:
OSTI Identifier:
20771471
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevC.73.044905; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CARBON 12 REACTIONS; CARBON 12 TARGET; ENERGY DEPENDENCE; GEV RANGE; LEAD 208 REACTIONS; LEAD 208 TARGET; MULTIPLICITY; NUCLEONS; POTENTIALS; PROTON-PROTON INTERACTIONS; RELATIVISTIC RANGE; SILICON 28 REACTIONS; SILICON 28 TARGET; STRANGENESS

Citation Formats

Becattini, F., Manninen, J., Gazdzicki, M., University of Oulu, Oulu, and Institut fuer Kernphysik, Universitaet Frankfurt, Frankfurt. Energy and system size dependence of chemical freeze-out in relativistic nuclear collisions. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.044905.
Becattini, F., Manninen, J., Gazdzicki, M., University of Oulu, Oulu, & Institut fuer Kernphysik, Universitaet Frankfurt, Frankfurt. Energy and system size dependence of chemical freeze-out in relativistic nuclear collisions. United States. doi:10.1103/PhysRevC.73.044905.
Becattini, F., Manninen, J., Gazdzicki, M., University of Oulu, Oulu, and Institut fuer Kernphysik, Universitaet Frankfurt, Frankfurt. Sat . "Energy and system size dependence of chemical freeze-out in relativistic nuclear collisions". United States. doi:10.1103/PhysRevC.73.044905.
@article{osti_20771471,
title = {Energy and system size dependence of chemical freeze-out in relativistic nuclear collisions},
author = {Becattini, F. and Manninen, J. and Gazdzicki, M. and University of Oulu, Oulu and Institut fuer Kernphysik, Universitaet Frankfurt, Frankfurt},
abstractNote = {We present a detailed study of chemical freeze-out in p-p, C-C, Si-Si, and Pb-Pb collisions at beam momenta of 158A GeV as well as Pb-Pb collisions at beam momenta of 20A, 30A, 40A, and 80A GeV. By analyzing hadronic multiplicities within the statistical hadronization model, we studied the parameters of the source as a function of the number of participating nucleons and the beam energy. We observe a nice smooth behavior of temperature, baryon chemical potential, and strangeness under-saturation parameter as a function of energy and nucleus size. Interpolating formulas are provided which allow us to predict the chemical freeze-out parameters in central collisions at center-of-mass energies {radical}(s){sub NN} > or approx. 4.5 GeV and for any colliding ions. Specific discrepancies between data and the model emerge in particle ratios in Pb-Pb collisions at beam energies between 20A and 40A GeV which cannot be accounted for in the considered model schemes.},
doi = {10.1103/PhysRevC.73.044905},
journal = {Physical Review. C, Nuclear Physics},
number = 4,
volume = 73,
place = {United States},
year = {Sat Apr 15 00:00:00 EDT 2006},
month = {Sat Apr 15 00:00:00 EDT 2006}
}