System-size dependence of the pion freeze-out volume as a potential signature for the phase transition to a Quark Gluon Plasma

Qingfeng Li, Caiwan Shen, Marcus Bleicher

Hanburry-Brown-Twiss (HBT) correlation functions and radii of negatively charged pions from C+C, Si+Si, Cu+Cu, and In+In at lower RHIC/SPS energies are calculated with the UrQMD tr…