TY - INPR A1 - Konchakovski, Volodymyr P. A1 - Haussler, Stéphane A1 - Gorenstein, Mark I. A1 - Bratkovskaya, Elena L. A1 - Bleicher, Marcus A1 - Stöcker, Horst T1 - Particle number fluctuations in high energy nucleus-nucleus collisions from microscopic transport approaches N2 - Event-by-event multiplicity fluctuations in nucleus-nucleus collisions are studied within the HSD and UrQMD transport models. The scaled variances of negative, positive, and all charged hadrons in Pb+Pb at 158 AGeV are analyzed in comparison to the data from the NA49 Collaboration. We find a dominant role of the fluctuations in the nucleon participant number for the final hadron multiplicity fluctuations. This fact can be used to check di erent scenarios of nucleus-nucleus collisions by measuring the final multiplicity fluctuations as a function of collision centrality. The analysis reveals surprising e ects in the recent NA49 data which indicate a rather strong mixing of the projectile and target hadron production sources even in peripheral collisions. PACS numbers: 25.75.-q,25.75.Gz,24.60.-k KW - Transport KW - Modell KW - Partikelzahlschwankung KW - Hadron KW - transport models KW - particle number fluctuations KW - mixing of hadron sources Y1 - 2005 UR - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/3125 UR - https://nbn-resolving.org/urn:nbn:de:hebis:30-22725 ER -