Hydrodynamical assessment of 200[ital A] GeV collisions
- Department of Physics, Brookhaven National Laboratory, Upton, New York 11973 (United States) Institut fuer Theoretische Physik, Universitaet Regensburg, D-93040 Regensburg (Germany)
We are analyzing the hydrodynamics of 200[ital A] GeV S+S collisions using a new approach which tries to quantify the uncertainties arising from the specific implementation of the hydrodynamical model. Based on a previous phenomenological analysis we use the global hydrodynamics model to show that the amount of initial flow, or initial energy density, cannot be determined from the hadronic momentum spectra. We additionally find that almost always a sizable transverse flow develops, which causes the system to freeze out, thereby limiting the flow velocity in itself. This freeze-out dominance in turn makes a distinction between a plasma and a hadron resonance gas equation of state very difficult, whereas a pure pion gas can easily be ruled out from present data. To complete the picture we also analyze particle multiplicity data, which suggest that chemical equilibrium is not reached with respect to the strange particles. However, the overpopulation of pions seems to be at most moderate, with a pion chemical potential far away from the Bose divergence.
- DOE Contract Number:
- AC02-76CH00016; FG02-93ER40768
- OSTI ID:
- 6953177
- Journal Information:
- Physical Review, C (Nuclear Physics); (United States), Vol. 50:3; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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SULFUR 32 REACTIONS
HYDRODYNAMIC MODEL
SULFUR 32 TARGET
ENERGY DENSITY
MOMENTUM TRANSFER
NUCLEAR MATTER
PIONS
RELATIVISTIC RANGE
TRANSVERSE MOMENTUM
BOSONS
CHARGED-PARTICLE REACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
HADRONS
HEAVY ION REACTIONS
LINEAR MOMENTUM
MATHEMATICAL MODELS
MATTER
MESONS
NUCLEAR REACTIONS
PARTICLE MODELS
PSEUDOSCALAR MESONS
STATISTICAL MODELS
TARGETS
THERMODYNAMIC MODEL
663450* - Heavy-Ion-Induced Reactions & Scattering- (1992-)
663530 - Nuclear Mass Ranges- A=20-38- (1992-)
663300 - Nuclear Reactions & Scattering
General- (1992-)