  One-nucleon removal reactions at or above the Fermi energy are important
tools to explore the single-particle structure of exotic nuclei. Experimental
data must be compared with calculations to extract structure information,
evaluate correlation effects in nuclei or determine reaction rates for nuclear
astrophysics. However, there is insufficient knowledge to calculate accurately
the cross sections for these reactions. We evaluate the contributions of the
final state interaction (FSI) and of the medium modifications of the
nucleon-nucleon interactions and obtain the shapes and magnitudes of momentum
distributions. Such effects have been often neglected in the literature.
Calculations for reactions at energies 35 - 1000 MeV/nucleon are reported and
compared to published data. For consistency, the state-of-the-art eikonal
method for stripping and diffraction dissociation is used. We find that the two
effects are important and their relative contributions vary with the energy and
with the atomic and mass number of the projectile involved. These two often
neglected effects modify considerably the one-nucleon removal cross sections.
As expected, the effect are largest at lower energies, around 50 MeV/nucleon
and on heavy targets.
