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Nuclear collisions at high energies in the hydrodynamical model taking into account freezing effects
I. N. Mishustin, L. M. Satarov
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Abstract
Collisions of identical heavy ions in the range of incident nucleus energies E/sub lab/ = 0.1--1 GeV/nucleon are studied. It is assumed that in the initial stage of the reaction a region of compressed nuclear matter in thermodynamic equilibrium is formed and its expansion is described using relativistic hydrodynamics. The equation of state of the equilibrium gas of nucleons, ..pi.. mesons, and ..delta.. resonances is discussed. It is assumed that the stage of free motion of the particles begins when the rate of two-body collisions gets smaller than the rate of decrease of the local matter density. The calculated inclusive cross sections for the yield of protons and ..pi.. mesons in the reactions /sup 20/Ne+/sup 20/Ne, /sup 40/Ar+/sup 40/Ar, and /sup 238/U+/sup 238/U at E/sub lab/ = 0.4, 0.8, and 2.1 GeV/nucleon are given. The nuclear matter density at the instant of maximum compression is estimated by comparison with the experimental data.