Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2003-04-29
Eur.Phys.J.A17:559-571,2003
Physics
Nuclear Physics
Nuclear Experiment
13 pages, 10 figures, accepted at EPJ A
Scientific paper
10.1140/epja/i2002-10160-3
Experimental data related to fragment production in central Au on Au collisions were analyzed 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 was 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.
Botvina A. S.
Neubert W.
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