Optimum two-body scattering T matrix elements on and off the energy shell for various potentials

Variationally optimized T matrices and phase shifts are reported for three potential scattering problems: (1) elastic scattering from a square well with a P state resonance, (2) elastic scattering from a Morse potential parameterized to fit S state nucleon--nucleon scattering data, and (3) off shell diagonal and nondiagonal scattering from the Reid potential. This last problem, involving a potential with long range attraction and short range repulsion, was selected for study because solving the three body problem within the context of the Faddeev formalism requires for input off shell two body T matrices arising from such a potential