D. Anchishkin, V. Vovchenko, S. Yezhov
On the basis of the proposed algorithm for calculation of the hadron reaction rates, the space-time structure of the relativistic nucleus-nucleus collisions is studied. The reaction zones and the reaction frequencies for various types of reactions are calculated for AGS and SPS energies within the microscopic transport model. The reaction zone boundaries are related to the kinetic and chemical freeze-outs. The specific characteristic time moments of the fireball evolution are introduced. It is found that the time of the division of a reaction zone into two separate parts does not depend on the collision energy. We argue that the evolution of nucleus-nucleus collision can be divided into two stages. The first stage is mainly attributed to nucleon processes with the most intensive reactions occur when two colliding nuclei fully overlap (this time moment depends on the initial nucleus velocity). The second stage is mainly attributed to secondary particles, which take part in decays, fusions, and elastic rescatterings with the most intensive reactions occurring at the time moment t ~ 6-10 fm/c for AGS and SPS energies, and the total duration of this stage gradually increases with the collision energy.
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http://arxiv.org/abs/1302.6190
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