  An important ingredient for applications of nuclear physics to e.g.
astrophysics or nuclear energy are the cross sections for reactions of neutrons
with rare isotopes. Since direct measurements are often not possible, indirect
methods like $(d,p)$ reactions must be used instead. Those $(d,p)$ reactions
may be viewed as effective three-body reactions and described with Faddeev
techniques. An additional challenge posed by $(d,p)$ reactions involving
heavier nuclei is the treatment of the Coulomb force. To avoid numerical
complications in dealing with the screening of the Coulomb force, recently a
new approach using the Coulomb distorted basis in momentum space was suggested.
In order to implement this suggestion separable representations of neutron- and
proton-nucleus optical potentials, which are not only complex but also energy
dependent, need to be introduced. Including excitations of the nucleus in the
calculation requires a multichannel optical potential, and thus separable
representations thereof.
