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Preliminary results on pion-pion Bose-Einstein correlations in central Pb+Pbcollisions measured by the NA49 experiment are presented. Rapidity as well astransverse momentum dependence of the HBT-radii are shown for collisions at 20,30, 40, 80, and 158 AGeV beam energy. Including results from AGS and RHICexperiments only a weak energy dependence of the radii is observed. Based onhydrodynamical models parameters like lifetime and geometrical radius of thesource are derived from the dependence of the radii on transverse momentum.Comment: 5 pages, 4 figures, contribution to the Quark Matter conference,  Oakland, USA, Jan 11-17, 200

journal of physics. g, nuclear and particle physics

Rapidity and transverse momentum dependence of Bose–Einstein correlations measured at 20, 30, 40, 80 and 158A. GeV beam energy