Yukawa Forces with Added Attractions

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Abstract
A "Yukawa potential" is defined here as the conventional second-order potential of pseudoscalar meson theory with pseudoscalar coupling, cut off by a hard repulsive core. We have carried out many calculations of the properties of the neutron-proton system at low energies assuming that the interaction is this Yukawa potential with various additional spin independent central wells. The results indicate that interactions of this type (including the Levy potential) do not give a satisfactory fit to the low-energy data.