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Multiplicity dependence of the pion source in S+A collisions at the CERN SPS |
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| Authors: | K. Kaimi H. Bøggild J. Boissevain M. Cherney J. Dodd S. Esumi C.W. Fabjan D.E. Fields A. Franz B. Holzer T.J. Humanic B. Jacak R. Jayanti H. Kalechofsky T. Kobayashi Y.Y. Lee M. Leltchouk B. Lörstad N. Maeda A. Medvedev A. Miyabayashi M. Murray S. Nishimura E. Noteboom S.U. Pandey F. Piuz V. Polychronakos M. Potekhin G. Poulard A. Sakaguchi J. Schmidt-Sorensen J. Simon-Gillo W. Sondheim T. Sugitate J.P. Sullivan Y. Sumi H. van Hecke W.J. Willis K. Wolf N. Xu |
| Affiliation: | 14. Hiroshima University, Higashi-Hiroshima, 739, Japan 24. Niels Bohr Institute, DK-2100, Copenhagen, Denmark 34. Los Alamos National Laboratory, Los Alamos, NM, 87545, USA 44. Creighton University, Omaha, NE, USA 54. Columbia University, New York, NY, 10027, USA 64. CERN, CH-1211, Geneva 23, Switzerland 74. Ohio State University, Columbus, OH, 43210, USA 84. National Laboratory for High Energy Physics, Tsukuba 305, Japan 94. University of Lund, S-22362, Lund, Sweden 104. Texas A&M University, College Station, TX, 77843, USA 114. Brookhaven National Laboratory, Upton, NY, 11973, USA |
| Abstract: | The emission of pions from relativistic heavy-ion collisions of S+S, S+Ag and S+Pb at 200 GeV/nucleon is characterized using two-particle interferometry. The multiplicity dependence of the pion source parameters near midrapidity is studied. The transversal (R t) and longitudinal (R l) pion source parameters are independent of the initial nuclei in the interaction and increase with increasing multiplicity. This suggests that the freeze-out process is governed mainly by the particle multiplicity. The multiplicity dependence is weaker than that expected from a simple model of a freeze-out at a constant density. |
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