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Source imaging methodology is used to provide a three-dimensional two-pionsource function for mid-rapidity pion pairs with $p_T<70$ MeV/c in central($0-7%$) Pb+Pb collisions at $\sqrt s_{NN}$=17.3 GeV. Prominent non-Gaussiantails are observed in the pion pair transverse momentum (outward) and in thebeam (longitudinal) directions. Model calculations reproduce them with theassumption of Bjorken longitudinal boost invariance and transverse flowblast-wave dynamics coupled with "outside-in burning" in the transversedirection; they also yield a proper time for breakup and emission duration forthe pion source.

Three-Dimensional two-pion source image from Pb+Pb Collisions at Sqrts_NN=17.3 GeV: New constraints for source breakup dynamics