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The investigation of the two-particle source function in lead-lead collisionssimulated by the EPOS model at a center of mass energy per nucleon pair of$\sqrt{s_{_{\text{NN}}}}=2.76$ TeV is presented. The two-particle sourcefunctions are reconstructed directly on an event-by-event basis for pions,kaons and protons separately, using the final stage of EPOS. A L\'evy sourceshape is observed for all three particle species in the individual events,deviating significantly from a Gaussian shape. The source parameters areextracted as functions of collision centrality and pair average transverse mass($m_{\text{T}}$). The L\'evy exponent is found to be ordered accordingly toparticle mass. The L\'evy scale parameter is found to scale for all particlespecies with $m_{\text{T}}$ according to Gaussian hydrodynamical predictions;however, there is no $m_{\text{T}}$-scaling found across these species. In caseof pions, the effects of the decay products and hadronic rescattering are alsoinvestigated. The L\'evy exponent is decreased when decay products are alsoincluded in the analysis. Without hadronic rescattering and decay products, thesource shape is close to a Gaussian.

Event-by-event investigation of the two-particle source function in $\sqrt{s_{_{\text{NN}}}}=2.76$ TeV PbPb collisions with EPOS