Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1999-07-15
Nucl.Phys. A661 (1999) 600-603
Physics
Nuclear Physics
Nuclear Theory
LaTEX, requires espcrs1.sty, 4 pages, 5 figures embedded, talk at Quark Matter '99, Torino, Italy, May 10-14, 1999
Scientific paper
The hypothesis of local equilibrium (LE) in relativistic heavy ion collisions at energies from AGS to RHIC is checked in the microscopic transport model. We find that kinetic, thermal, and chemical equilibration of the expanding hadronic matter is nearly reached in central collisions at AGS energy for $t \geq 10$ fm/$c$ in a central cell. At these times the equation of state may be approximated by a simple dependence $P \cong (0.12-0.15) \epsilon$. Increasing deviations of the yields and the energy spectra of hadrons from statistical model values are observed for increasing bombarding energies. The origin of these deviations is traced to the irreversible multiparticle decays of strings and many-body $(N \geq 3)$ decays of resonances. The violations of LE indicate that the matter in the cell reaches a steady state instead of idealized equilibrium. The entropy density in the cell is only about 6% smaller than that of the equilibrium state.
Bass Steffen A.
Belkacem M.
Bleicher Marcus
Brandstetter M.
Bravina Larissa V.
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