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Final conditions in high energy heavy ion collisions

Y. Sinyukov,S. V. Akkelin,N. Xu

Published 1998 in Physical Review C

ABSTRACT

Motivated by the recent experimental observations, we discuss the freeze-out properties of the fireball created in central heavy ion collisions. We find that the freeze-out conditions, like temperature, velocity gradient near center of the fireball, are similar for different colliding systems and beam energies. This means that the transverse flow is stronger in the collisions of heavy nuclei than that of the light ones. The system that created in relativistic heavy-ion collision can have both longitudinal and transverse expansion (see, e.g., [1]). In order to study the hadronic experimental data [2, 3], one needs a mathematical description of a final stage of collisions. At the region near mid-rapidity the boundary effect, due to the finite length of the hydrodynamic tube in longitudinal direction, can be neglected [4]. It is possible to use Bjorken’s model for longitudinal expansion: vl = xl/t. The same quasi-inertial flow is inherent to Landau model at freeze-out stage [5, 6]. In this approach, the parameter � was introduced to describe proper time of the expanding system. For the transverse expansion, we will use a rather general picture proposed in

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