  Low-density nuclear matter at finite temperature is considered representing
the strong coupling situation of a highly correlated fermion system.
One-particle se lf-energies and the density of states in the vicinity of the
pairing transition point are presented. Within the Green function approach
model calculations are p erformed using the thermodynamic $T$ matrix in ladder
approximation. As a main r esult the formation of a pseudogap in the level
density near the critical temper ature of the pairing phase transition has been
found. It is shown that compared to mean field, the picture of the onset of the
pairing transition is essentially changed if correlations are taken into
account.
