Local thermodynamical equilibrium and the equation of state of hot, dense matter created in Au+Au collisions at AGS

  • Local kinetic and chemical equilibration is studied for Au+Au collisions at 10.7 AGeV in the microscopic Ultrarelativistic Quantum Molecular Dynamics model (UrQMD). The UrQMD model exhibits dramatic deviations from equilibrium during the high density phase of the collision. Thermal and chemical equilibration of the hadronic matter seems to be established in the later stages during a quasiisentropic expansion, observed in the central reaction cell with volume 125 fm3. For t > 10 fm/c the hadron energy spectra in the cell are nicely reproduced by Boltzmann distributions with a common rapidly dropping temperature. Hadron yields change drastically and at the late expansion stage follow closely those of an ideal gas statistical model. The equation of state seems to be simple at late times: P = 0.12 Epsilon. The time evolution of other thermodynamical variables in the cell is also presented.

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Author:Larissa BravinaORCiDGND, Mark I. GorensteinORCiDGND, Mohamed Belkacem, Steffen A. BassORCiDGND, Marcus BleicherORCiDGND, Mathias Brandstetter, M. Hofmann, Sven SoffORCiD, Christian Spieles, Henning WeberGND, Horst StöckerORCiDGND, Walter GreinerGND
Document Type:Preprint
Date of Publication (online):2005/04/13
Year of first Publication:1998
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2005/04/13
Tag:Monte-Carlo model for relativistic heavy ion collisions; Statistical model; equation of state; thermalization
Preprint, später in Phys.Lett. B434 (1998) 379-387
Source:http://de.arxiv.org/abs/nucl-th/9804008 , Phys.Lett. B434 (1998) 379-387
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
PACS-Classification:20.00.00 NUCLEAR PHYSICS / 24.00.00 Nuclear reactions: general / 24.10.-i Nuclear reaction models and methods / 24.10.Lx Monte Carlo simulations (including hadron and parton cascades and string breaking models)
20.00.00 NUCLEAR PHYSICS / 24.00.00 Nuclear reactions: general / 24.10.-i Nuclear reaction models and methods / 24.10.Pa Thermal and statistical models
Licence (German):License LogoDeutsches Urheberrecht