  We study J/psi suppression in AB collisions assuming that the charmonium
states evolve from small, color transparent configurations. Their interaction
with nucleons and nonequilibrated, secondary hadrons is simulated using the
microscopic model UrQMD. The Drell-Yan lepton pair yield and the
J/psi/Drell-Yan ratio are calculated as a function of the neutral transverse
energy in Pb+Pb collisions at 160 GeV and found to be in reasonable agreement
with existing data.
