Source Dimensions in Ultrarelativistic Heavy Ion Collisions

Abstract

Recent experiments on pion correlations, interpreted as interferometric measurements of the collision zone, are compared with models that distinguish a prehadronic phase and a hadronic phase. The models include prehadronic longitudinal expansion, conversion to hadrons in local kinetic equilibrium, and rescattering of the produced hadrons. We find that the longitudinal and outward radii are surprisingly sensitive to the algorithm used for two-body collisions. The longitudinal radius measured in collisions of 200 GeV/u sulfur nuclei on a heavy target requires the existence of a prehadronic phase which converts to the hadronic phase at densities around 0.8-1.0 GeV/fm${}^3$. The transverse radii cannot be reproduced without introducing more complex dynamics into the transverse expansion.

RevTeX 3.0, 28 pages, 6 figures, not included, revised version, major change is an additional discussion of the classical two-body collision algorithm, a (compressed) postscript file of the complete paper including figures can be obtained from Authors or via anonymous ftp at ftp://ftp_int.phys.washington.edu/pub/herrmann/pisource.ps.Z

References in corpus (3)

• Thermal phenomenology of hadrons from 200 AGeV S+S collisions
• Hanbury-Brown--Twiss Analysis in a Solvable Model
• Chemical Relaxation Times in a Hadron Gas at Finite Temperature

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