arXiv:nucl-th/0104023·v1·Nuclear Theory
Chemical freeze-out parameters at RHIC from microscopic model calculations
L.V. Bravina (1)🇷🇺 · E.E. Zabrodin (1,2)🇷🇺 · S.A. Bass (3,4)🇺🇸 · A. Faessler (2)🇩🇪 · C. Fuchs(2)🇩🇪 · M.I. Gorenstein(5,6)🇩🇪 · W. Greiner(5)🇩🇪 · S. Soff(7)🇺🇸 · H. Stoecker(5)🇩🇪 · H. Weber(5) (1-Institute for Nuclear Physics, Moscow State University; 2-Institut fuer Theoretische Physik, Universitaet Tuebingen; 3-Department of Physics, Duke University; 4-RIKEN-BNL Research Center; 5-Institut fuer Theoretische Physik, Universitaet Frankfurt; 6-Bogolyubov Institute for Theoretical Physics, Kiev; 7-Nuclear Science Division, LBNL, Berkeley)🇩🇪
Abstract
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/. Within this time the matter in the cell expands nearly isentropically with the entropy to baryon ratio . 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 AGeV. The formation of a resonance-rich state at RHIC energies is discussed.
Comments: Talk at the conference Quark Matter'2001, 4 pages, to appear in Nucl. Phys. A