Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1997-03-14
Nucl.Phys. A619 (1997) 391-412
Physics
Nuclear Physics
Nuclear Theory
36 pages, Latex
Scientific paper
10.1016/S0375-9474(97)00182-6
To describe ultrarelativistic heavy-ion collisions we construct a three-fluid hydrodynamical model. In contrast to one-fluid hydrodynamics, it accounts for the finite stopping power of nuclear matter, i.e. for nonequilibrium effects in the early stage of the reaction. Within this model, we study baryon dynamics in the BNL-AGS energy range. For the system Au+Au we find that kinetic equilibrium between projectile and target nucleons is established only after a time $t_{CM}^{eq}\approx 5~fm/c\simeq 2R_{Au}/\gamma_{CM}$. Observables which are sensitive to the early stage of the collision (like e.g. nucleon flow) therefore differ considerably from those calculated in the one-fluid model.
Brachmann J.
Dumitru Adrian
Greiner Walter
Maruhn Joachim A.
Rischke Dirk H.
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