Universal pion freeze-out in heavy-ion collisions

Based on an evaluation of recent systematic data on two-pion interferometry and on measured 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 va...

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Detalles Bibliográficos
Autores principales: Adamova, D, Agakichiev, G, Appelshäuser, H, Belaga, V, Braun-Munzinger, P, Castillo, A, Cherlin, A, Damjanovic, S, Dietel, T, Dietrich, L, Drees, A, Esumi, S I, Filimonov, K, Fomenko, K, Fraenkel, Zeev, Garabatos, C, Glässel, P, Hering, G, Holeczek, J, Kushpil, V, Lenkeit, B C, Ludolphs, W, Maas, A, Marin, A, Milosevic, J, Milov, A, Miskowiec, D, Panebratsev, Yu A, Petchenova, O Yu, Petracek, V, Pfeiffer, A, Rak, J, Ravinovich, I, Rehak, P, Sako, H, Schükraft, Jürgen, Sedykh, S, Shimansky, S S, Slivova, J, Specht, H J, Stachel, J, Sumbera, M, Tilsner, H, Tserruya, Itzhak, Wessels, J P, Wienold, T, Windelband, B, Wurm, J P, Xie, W, Yurevich, S, Yurevich, V, Schmitz, W
Lenguaje:eng
Publicado: 2002
Materias:
Nuclear Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.90.022301
http://cds.cern.ch/record/570547
Descripción
Sumario:Based on an evaluation of recent systematic data on two-pion interferometry and on measured 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 approximately 2.5 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 its value is constant at all currently available beam energies from AGS to RHIC.

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