TY  - CONF
A1  - Bass, Steffen A.
A1  - Weber, Henning
A1  - Ernst, Christoph
A1  - Bleicher, Marcus
A1  - Belkacem, Mohamed
A1  - Bravina, Larissa
A1  - Soff, Sven
A1  - Stöcker, Horst
A1  - Greiner, Walter
A1  - Spieles, Christian
T1  - Reaction dynamics in Pb+Pb at the CERN/SPS: from partonic degrees of freedom to freeze-out
T2  - Proceedings of the Erice School on Nuclear Physics in Erice, Sicily, Italy, September 17 -25 1998
N2  - We analyze the reaction dynamics of central Pb+Pb collisions at 160 GeV/nucleon. First we estimate the energy density pile-up at mid-rapidity and calculate its excitation function: The energy density is decomposed into hadronic and partonic contributions. A detailed analysis of the collision dynamics in the framework of a microscopic transport model shows the importance of partonic degrees of freedom and rescattering of leading (di)quarks in the early phase of the reaction for E >= 30 GeV/nucleon. The energy density reaches up to 4 GeV/fm 3, 95% of which are contained in partonic degrees of freedom. It is shown that cells of hadronic matter, after the early reaction phase, can be viewed as nearly chemically equilibrated. This matter never exceeds energy densities of 0.4 GeV/fm 3, i.e. a density above which the notion of separated hadrons loses its meaning. The final reaction stage is analyzed in terms of hadron ratios, freeze-out distributions and a source analysis for final state pions.
Y1  - 1998
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/4804
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30-6916
UR  - http://de.arxiv.org/abs/nucl-th/9810077
N1  - to be published in Progress in Particle and Nuclear Physics Vol. 42
ER  -