Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1999-02-23
Phys.Rev.C60:021902,1999
Physics
Nuclear Physics
Nuclear Theory
11 pages, 4 eps-figures included, revised version
Scientific paper
10.1103/PhysRevC.60.021902
We analyze the hadronic freeze-out in ultra-relativistic heavy ion collisions at RHIC in a transport approach which combines hydrodynamics for the early, dense, deconfined stage of the reaction with a microscopic non-equilibrium model for the later hadronic stage at which the hydrodynamic equilibrium assumptions are not valid. With this ansatz we are able to self-consistently calculate the freeze-out of the system and determine space-time hypersurfaces for individual hadron species. The space-time domains of the freeze-out for several hadron species are found to be actually four-dimensional, and differ drastically for the individual hadrons species. Freeze-out radii distributions are similar in width for most hadron species, even though the Omega-baryon is found to be emitted rather close to the phase boundary and shows the smallest freeze-out radii and times among all baryon species. The total lifetime of the system does not change by more than 10% when going from SPS to RHIC energies.
Bass Steffen A.
Bleicher Marcus
Bravina Larissa
Dumitru Adrian
Greiner Walter
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