Equilibrium and nonequilibrium effects in nucleus nucleus collisions

Abstract: Local thermal and chemical equilibration is studied for central AqA collisions at 10.7 160 AGeV in the Ultrarelativis- . tic Quantum Molecular Dynamics model UrQMD . The UrQMD model exhibits strong deviations f
Abstract: Local thermal and chemical equilibration is studied for central AqA collisions at 10.7 160 AGeV in the Ultrarelativis- . tic Quantum Molecular Dynamics model UrQMD . The UrQMD model exhibits strong deviations from local equilibrium at the high density hadron string phase formed during the early stage of the collision. Equilibration of the hadron resonance matter is established in the central cell of volume Vs125 fm3 at later stages, tG10 fmrc, of the resulting quasi-isentropic expansion. The thermodynamical functions in the cell and their time evolution are presented. Deviations of the UrQMD quasi-equilibrium state from the statistical mechanics equilibrium are found. They increase with energy per baryon and lead to a strong enhancement of the pion number density as compared to statistical mechanics estimates at SPS energies. PACS: 25.75.-q; 24.10.Lx; 24.10.Pa; 64.30.qt
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Metadaten
Author:Larissa V. Bravina, Mark I. Gorenstein, Eugene E. Zabrodin, Steffen A. Bass, Mohamed Belkacem, Marcus Bleicher, Mathias Brandstetter, Markus Hofmann, Sven Soff, Christian Spieles, H. Weber, Horst Stöcker, Walter Greiner
URN:urn:nbn:de:hebis:30-22848
Document Type:Article
Language:English
Date of Publication (online):2005/12/07
Year of first Publication:1999
Publishing Institution:Univ.-Bibliothek Frankfurt am Main
Release Date:2005/12/07
Tag:Kollisionen schwerer Ionen ; Nichtgleichgewicht; QMD Modell ; Zustandsgleichung ; lokales thermodynamisches Gleichgewicht
Equation of state ; Heavy ion collisions ; Local thermodynamical equilibrium ; Non-equilibrium effects; QMD model
HeBIS PPN:Phys.Lett.B459:660-666,1999.
Institutes:Physik
Dewey Decimal Classification:530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License Logo Veröffentlichungsvertrag für Publikationen

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