TY  - INPR
A1  - Bravina, Larissa
A1  - Zabrodin, Eugene E.
A1  - Gorenstein, Mark I.
A1  - Bass, Steffen A.
A1  - Belkacem, Mohamed
A1  - Bleicher, Marcus
A1  - Brandstetter, Mathias
A1  - Ernst, Christoph
A1  - Hofmann, Markus
A1  - Neise, Ludwig
A1  - Soff, Sven
A1  - Weber, Henning
A1  - Stöcker, Horst
A1  - Greiner, Walter
T1  - Local equilibrium in heavy ion collisions. Microscopic model versus statistical model analysis
N2  - The assumption of local equilibrium in relativistic heavy ion collisions at energies from 10.7 AGeV (AGS) up to 160 AGeV (SPS) is checked in the microscopic transport model. Dynamical calculations performed for a central cell in the reaction are compared to the predictions of the thermal statistical model. We find that kinetic, thermal and chemical equilibration of the expanding hadronic matter are nearly approached late in central collisions at AGS energy for t >= 10 fm/c in a central cell. At these times the equation of state may be approximated by a simple dependence P ~= (0.12-0.15) epsilon. Increasing deviations of the yields and the energy spectra of hadrons from statistical model values are observed for increasing energy, 40 AGeV and 160 AGeV. These violations of local equilibrium indicate that a fully equilibrated state is not reached, not even in the central cell of heavy ion collisions at energies above 10 AGeV. The origin of these findings is traced to the multiparticle decays of strings and many-body decays of resonances.
Y1  - 1999
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/4794
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30-7074
UR  - http://de.arxiv.org/abs/hep-ph/9906548
N1  - REVTEX, 37 pages (incl. 20 figs.), to be published in Phys.Rev. C60 (1999) 024904
ER  -