Range of the Spin-Orbit Force Between Two Protons

The effect or decreasing the range of the spin-orbit potential to the meson-theoretical'' value of 0.7 x 10-12 cm was investigated. The spin-orbit force is not unique. A reduction in range does not harm agreement with the p-p scattering data at 150 Mev. At 300 Mev, the reduced range yields phase shifts which constitute a distinct improvement over the previous ones. Short-range repulsive cores can readily be introduced into the Gartenhaus potential to eliminate the unphysical bound states without adverse effects on the scattering. It is not excluded that a more exotic combination of spin-orbit and modified Gartenhaus potentials can explain the p-p scattering data up to 300 Mev. (T.B.A.)