Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2001-08-31
J.Phys.G27:2325-2344,2001
Physics
High Energy Physics
High Energy Physics - Experiment
22 pages, 11 figures, TeX
Scientific paper
10.1088/0954-3899/27/11/311
Two-particle correlation functions of negatively charged hadrons from Pb-Pb collisions at 158 GeV/c per nucleon have been measured by the WA97 experiment at the CERN SPS. A Coulomb correction procedure that assumes an expanding source has been implemented. Within the framework of an expanding thermalized source model the size and dynamical state of the collision fireball at freeze-out have been reconstructed as a function of the centrality of the collision. Less central collisions exhibit a different dynamics than central ones: both transverse and longitudinal expansion velocities are slower, the expansion duration is shorter and the system freezes out showing smaller dimensions and higher temperature.
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