J/Psi suppression in an expanding equilibrium hadron gas
  We consider an ideal gas of massive hadrons in thermal and chemical equilibrium. The finite-size gas expands longitudinally in accordance with Bjorken law. Also the transverse expansion in a form of the rarefaction wave is considered. We show that J/Psi suppression in such an environment, when combined with the disintegration in nuclear matter, agrees qualitatively well with NA38 and NA50 data. 
Dariusz Prorok (IFT Wroclaw Univ. Poland) and Ludwik Turko (IFT   Wroclaw Univ. Poland)