Universal Pion Freeze-out in Heavy-Ion Collisions

Details Universal Pion Freeze-out in Heavy-Ion Collisions Universal Pion Freeze-out in Heavy-Ion Collisions

2002-07-16

arxiv.org/abs/nucl-ex/0207008v2

Phys.Rev.Lett.90:022301,2003

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 3 figures, revised version resubmitted to PRL

Scientific paper

10.1103/PhysRevLett.90.022301

Based on an evaluation of data on pion interferometry and on particle yields at mid-rapidity, we propose a universal condition for thermal freeze-out of pions in heavy-ion collisions. We show that freeze-out occurs when the mean free path of pions lambda_f reaches a value of about 1 fm, which is much smaller than the spatial extent of the system at freeze-out. This critical mean free path is independent of the centrality of the collision and beam energy from AGS to RHIC.

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