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Two-particle correlations have been measured for identified negative pionsfrom central 158 AGeV Pb+Pb collisions and fitted radii of about 7 fm in alldimensions have been obtained. A multi-dimensional study of the radii as afunction of kT is presented, including a full correction for the resolutioneffects of the apparatus. The cross term Rout-long of the standard fit in theLongitudinally CoMoving System (LCMS) and the vl parameter of the generalisedYano-Koonin fit are compatible with 0, suggesting that the source undergoes aboost invariant expansion. The shapes of the correlation functions in Qinv andQspace have been analyzed in detail. They are not Gaussian but betterrepresented by exponentials. As a consequence, fitting Gaussians to thesecorrelation functions may produce different radii depending on the acceptanceof the experimental setup used for the measurement.Comment: 13 pages including 10 figure

Central Pb+Pb collisions at 158 A GeV/c studied by $\pi^-\pi^-$ interferometry