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Two-particle correlation functions of negative hadrons over wide phase space,and transverse mass spectra of negative hadrons and deuterons near mid-rapidityhave been measured in central Pb+Pb collisions at 158 GeV per nucleon by theNA49 experiment at the CERN SPS. A novel Coulomb correction procedure for thenegative two-particle correlations is employed making use of the measuredoppositely charged particle correlation. Within an expanding source scenariothese results are used to extract the dynamic characteristics of the hadronicsource, resolving the ambiguities between the temperature and transverseexpansion velocity of the source, that are unavoidable when single and twoparticle spectra are analysed separately. The source shape, the total durationof the source expansion, the duration of particle emission, the freeze-outtemperature and the longitudinal and transverse expansion velocities arededuced.Comment: revised version, to be published in Eur. Phys. J.

Hadronic expansion dynamics in central Pb+Pb collisions at 158 GeV per nucleon