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Universal Pion Freeze-Out in Heavy-Ion Collisions

Universal Pion Freeze-Out in Heavy-Ion Collisions

Based on an evaluation of data on pion interferometry and on particle yields at midrapidity, 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 …