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Two-particle correlation functions of negatively charged hadrons from Pb-Pbcollisions at 158 GeV/c per nucleon have been measured by the WA97 experimentat the CERN SPS. A Coulomb correction procedure that assumes an expandingsource has been implemented. Within the framework of an expanding thermalizedsource model the size and dynamical state of the collision fireball atfreeze-out have been reconstructed as a function of the centrality of thecollision. Less central collisions exhibit a different dynamics than centralones: both transverse and longitudinal expansion velocities are slower, theexpansion duration is shorter and the system freezes out showing smallerdimensions and higher temperature.Comment: 22 pages, 11 figures, Te

Centrality dependence of the expansion dynamics in Pb-Pb collisions at 158AGeVc-1

Centrality dependence of the expansion dynamics in Pb-Pb collisions at 158AGeVc^-1