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19 April 2024

» pubmed » pmid12570540

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Universal pion freeze-out in heavy-ion collisions
D Adamová ; G Agakichiev ; H Appelshäuser ; V Belaga ; P Braun-Munzinger ; A Castillo ; A Cherlin ; S Damjanovi? ; T Dietel ; L Dietrich ; A Drees ; S I Esumi ; K Filimonov ; K Fomenko ; Z Fraenkel ; C Garabatos ; P Glässel ; G Hering ; J Holeczek ; V Kushpil ; B Lenkeit ; W Ludolphs ; A Maas ; A Marín ; J Milosevi? ; A Milov ; D Mi?kowiec ; Yu Panebrattsev ; O Petchenova ; V Petrácek ; A Pfeiffer ; J Rak ; I Ravinovich ; P Rehak ; H Sako ; W Schmitz ; J Schukraft ; S Sedykh ; S Shimansky ; J Slívová ; H J Specht ; J Stachel ; M Sumbera ; H Tilsner ; I Tserruya ; J P Wessels ; T Wienold ; B Windelb ; J P Wurm ; W Xie ; S Yurevich ; V Yurevich ; ;
Date:	17 Jan 2003
Journal:	Phys Rev Lett, 90 (2), 022301
Abstract:	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 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 the Alternating Gradient Synchrotron to the Relativistic Heavy Ion Collider.
Source:	PubMed, pmid12570540
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