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Limits of complete equilibration of fragments produced in central Au on Au collisions at intermediate energies

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Abstract.

Experimental data related to fragment production in central Au on Au collisions were analysed in the framework of a modified statistical model which considers cluster production both prior and at the equilibrated stage. The analysis provides limits to the number of nucleons and to the temperature of the equilibrated source. The rather moderate temperatures obtained from experimental double-yield ratios of d, t, 3He and 4He are in agreement with the model calculations. A phenomenological relation was established between the collective flow and the chemical temperature in these reactions. It is shown that dynamical mechanisms of fragment production, e.g. coalescence, dominate at high energies. It is demonstrated that coalescence may be consistent with chemical equilibrium between the produced fragments. The different meaning of chemical and kinetic temperatures is discussed.

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Authors and Affiliations

  1. Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf, 01314, Dresden, Germany

    W. Neubert

  2. Institut für Kern- und Hadronenphysik, Gesellschaft für Schwerionenforschung, 64291, Darmstadt, Germany

    A.S. Botvina

  3. Institut für Kern- und Hadronenphysik, Russian Academy of Science, 117312, Russia

    A.S. Botvina

Authors
  1. W. Neubert
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  2. A.S. Botvina
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Correspondence to W. Neubert.

Additional information

Communicated by A. Molinari

Received: 14 November 2002, Published online: 8 July 2003

PACS:

25.70.Mn Projectile and target fragmentation - 25.70.Pq Multifragment emission and correlations - 25.75.-q Relativistic heavy-ion collisions

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Neubert, W., Botvina, A. Limits of complete equilibration of fragments produced in central Au on Au collisions at intermediate energies. Eur. Phys. J. A 17, 559–571 (2003). https://doi.org/10.1140/epja/i2002-10160-3

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