A Semi-phenomenological Neutron-Proton Potential

A T=0 two-nucleon potential is found which, when combined with the T=1 potential reported previously, can reproduce all experimental neutron-proton data below 300 Mev. The triplet even parity potential is not strictly energy independent. The required energy dependence is, however, very small and confined in the core region. In the triplet even parity state, it is found that both linear and quadratic LS potentials are requrired. The linear LS potential is weak and repulsive. The quadratic LS potential is here stronger than that required in the T=1 state and it is attractive. The singlet odd parity potential is slightly more repulsive than that of the one-pion-exchange potential. We conclude that all two-nucleon data up to 300 Mev can be understood in terms of a potential picture which is consistent with the current implications of the pion theory of nuclear forces.