The freeze-out mechanism and phase-space density in ultrarelativistic heavy-ion collisions

Details The freeze-out mechanism and phase-space density in ultrarelativistic heavy-ion collisions The freeze-out mechanism and phase-space density in ultrarelativistic heavy-ion collisions

2002-07-25

arxiv.org/abs/nucl-th/0207074v3

Phys.Rev. C68 (2003) 034905

Physics

Nuclear Physics

Nuclear Theory

8 pages, 2 figures, although conclusions are unchanged, the paper has been re-written and the title has been changed for the s

Scientific paper

10.1103/PhysRevC.68.034905

We explore the consequences of a freeze-out criterion for heavy-ion collisions, based on pion escape probabilities from the hot and dense but rapidly expanding collision region. The influence of the expansion and the scattering rate on the escape probability is studied. The temperature dependence of this scattering rate favors a low freeze-out temperature of ~100 MeV. In general, our results support freeze-out along finite four-volumes rather than sharp three-dimensional hypersurfaces, with high-pt particles decoupling earlier from smaller volumes. We compare our approach to the proposed universal freeze-out criteria using the pion phase-space density and its mean free path.

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