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Exploration of the rich structure of the QCD phase diagram is an importanttopic in the RHIC heavy ion program. One of the ultimate goals of this programis to search for the critical endpoint. Investigation of the space-timestructure of hadron emissions at various phase transition points usingBose-Einstein correlations of identical bosons may provide insight on thelocation of the critical endpoint. PHENIX has performed comprehensivemeasurements of the Bose-Einstein correlation in Au+Au collisions at sqrt(sNN)= 15, 19, 27, 39, 62.4, and 200 GeV, where we incorporated Levy-type sourcefunctions to describe the measured correlation functions. We put particularfocus on one of the parameters of the Levy-type source functions, the index ofstability alpha, which is related to one of the critical exponents (theso-called correlation exponent eta). We have measured its collision energy andcentrality dependence. We have also extended our analysis from two-particle tothree-particle correlations to characterize the nature of the hadron emissionsource. The three particle correlations confirmed the findings of thetwo-particle correlations, and also provide insight on the pion productionmechanism beyond the core-halo model.

Exploring the QCD phase diagram via the collision energy dependence of multi-particle femtoscopy with PHENIX