  After pointing out the difference between normal and anomalous diffusion, we
consider a hadron resonance cascade (HRC) model simulation for particle
emission at RHIC and point out, that rescattering in an expanding hadron
resonance gas leads to a heavy tail in the source distribution. The results are
compared to recent PHENIX measurements of the tail of the particle emitting
source in Au+Au collisions at RHIC. In this context, we show, how can one
distinguish experimentally the anomalous diffusion of hadrons from a second
order QCD phase transition.
