Multiplicity dependence of the pion source in S+A collisions at the CERN SPS

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. MedvedevA. 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

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


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 mid-rapidity is studied. The transversal (Rt) and longitudinal (Hl) 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.

Original languageEnglish (US)
Pages (from-to)619-625
Number of pages7
JournalZeitschrift fur Physik C-Particles and Fields
Issue number4
StatePublished - Aug 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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