  The nucleon spectral function in infinite nuclear matter is calculated in a
quantum transport theoretical approach. Exploiting the known relation between
collision rates and correlation functions the spectral function is derived
self-consistently. By re-inserting the spectral functions into the collision
integrals the description of hard processes from the high-momentum components
of wave functions and interactions is improved iteratively until convergence is
achieved. The momentum and energy distributions and the nuclear matter
occupation probabilities are in very good agreement with the results obtained
from many-body theory.
