Chemical freeze-out parameters at RHIC from microscopic model calculations

Details Chemical freeze-out parameters at RHIC from microscopic model calculations Chemical freeze-out parameters at RHIC from microscopic model calculations

2001-04-06

arxiv.org/abs/nucl-th/0104023v1

Nucl.Phys. A698 (2002) 383-386

Physics

Nuclear Physics

Nuclear Theory

Talk at the conference Quark Matter'2001, 4 pages, to appear in Nucl. Phys. A

Scientific paper

10.1016/S0375-9474(01)01385-9

The relaxation of hot nuclear matter to an equilibrated state in the central zone of heavy-ion collisions at energies from AGS to RHIC is studied within the microscopic UrQMD model. It is found that the system reaches the (quasi)equilibrium stage for the period of 10-15 fm/$c$. Within this time the matter in the cell expands nearly isentropically with the entropy to baryon ratio $S/A = 150 - 170$. Thermodynamic characteristics of the system at AGS and at SPS energies at the endpoints of this stage are very close to the parameters of chemical and thermal freeze-out extracted from the thermal fit to experimental data. Predictions are made for the full RHIC energy $\sqrt{s} = 200$ AGeV. The formation of a resonance-rich state at RHIC energies is discussed.

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