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Influence of impact parameter on thermal description of relativistic heavy ion collisions at (1–2)A GeV

Jean Cleymans1, Helmut Oeschler2, and Krzysztof Redlich3,4

  • 1Department of Physics, University of Cape Town, Rondebosch 7701, South Africa
  • 2Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
  • 3Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany
  • 4Institute for Theoretical Physics, University of Wrocław, PL-50204 Wrocław, Poland

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Phys. Rev. C 59, 1663 – Published 1 March, 1999

DOI: https://doi.org/10.1103/PhysRevC.59.1663

Abstract

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 nonlinear 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 (π+/p,π−/π+,d/p,K+/π+, and K+/K− but not η/π0) 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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Phys. Rev. C 59, 1663– Published 1 March, 1999
  • Received 9 September 1998

© 1999 American Physical Society

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