The microscopic, momentum space, optical potential description of spin 1/2 x 1/2 scattering is extended to include the coupling of the singlet-triplet spin channels and
the exact handling of the Coulomb force. Computing performance in constructing
the optical potential and in solving the coupled-channels Lippmann-Schwinger equations
is enhanced by parallelization via the PVM library. Cross sections and spin
observables are predicted for p - ¹³C and p - ³He elastic scattering at 500 MeV.
The complete set of nucleon-trinucleon reactions is calculated to investigate the
sensitivity of these reactions to charge-symmetry breaking effects
