  We address the formation of correlations in a general nonequilibrium
situation. As an example we calculate the formation of light composite
particles in a heavy ion collision. In particular we study the formation of
deuterons via three-body reactions in some detail. To calculate the relevant
reaction rates we solve the Faddeev equation which is consistently modified to
include the self energy corrections and Pauli blocking factors due to
surrounding nucleons. We find that the time scales of the reaction as well as
the number of emitted deuterons change as medium dependent rates are used in
the calculation.
