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Universal pion freeze-out in heavy-ion collisions

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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 muc...

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Main Authors: Adamová, Dagmar (Author) , Appelshäuser, Harald (Author) , Braun-Munzinger, Peter (Author) , Damjanović, Sanja (Author) , Dietel, Thomas (Author) , Dietrich, Lars (Author) , Drees, Axel (Author) , Esumi, ShinIchi (Author) , Filimonov, Kirill (Author) , Glässel, Peter (Author) , Lenkeit, Björn (Author) , Dubitzky, Wilrid (Author) , Milošević, Jovan (Author) , Petráček, Vojtech (Author) , Bielčíková, Jana (Author) , Specht, Hans Joachim (Author) , Stachel, Johanna (Author) , Tilsner, Heinz (Author) , Wessels, Johannes P. (Author) , Wienold, Thomas (Author) , Windelband, Bernd (Author) , Yurevich, Sergey (Author)
Format: Article (Journal) Chapter/Article
Language:English
Published: 2002
In: Arxiv

Online Access:Verlag, kostenfrei, Volltext: http://arxiv.org/abs/nucl-ex/0207008
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Author Notes:D. Adamová, G. Agakichiev, H. Appelshäuser, V. Belaga, P. Braun-Munzinger, A. Castillo, A. Cherlin, S. Damjanović, 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. Milošević, A. Milov, D. Miśkowiec, Yu. Panebrattsev, O. Petchenova, V. Petráček, 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. Šumbera, H. Tilsner, I. Tserruya, J.P. Wessels, T. Wienold, B. Windelband, J.P. Wurm, W. Xie, S. Yurevich, V. Yurevich (CERES Collaboration)
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Summary: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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