Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1997-11-26
J.Phys. G24 (1998) 1777-1784
Physics
Nuclear Physics
Nuclear Theory
RevTeX, 11 pages, 3 figures
Scientific paper
10.1088/0954-3899/24/9/010
Preliminary experimental data for particle number ratios in the collisions of Au+Au at the BNL AGS (11$A$ GeV/$c$) and Pb+Pb at the CERN SPS (160$A$ GeV/$c$) are analyzed in a thermodynamically consistent hadron gas model with excluded volume. Large values of temperature, T=140--185 MeV, and baryonic chemical potential, $\mu_b=590$--270 MeV, close to the boundary of the quark-gluon plasma phase are found from fitting the data. This seems to indicate that the energy density at the chemical freezeout is tremendous which would be indeed the case for the point-like hadrons. However, a self-consistent treatment of the van der Waals excluded volume reveals much smaller energy densities which are very far below a lowest limit estimate of the quark-gluon plasma energy density.
Gorenstein Mark I.
Greiner Walter
Stoecker Horst
Yang Shin Nan
Yen Granddon D.
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