High Energy Nucleon-Nucleon Scattering Experiments at Berkeley

The experimental results for n-p and p-p scattering at high energies are described, and a review of the present status of theoretical interpretation is given. For the scattering of 90-Mev neutrons by protons the angular distribution indicates that only even states of angular momentum are strongly effective. Evidence of the operation of exchange forces is mentioned. In the scattering of 32-Mev protons by protons the angular distribution is appropriate to s-state interaction alone. The 340-Mev p-p results indicate the existence of noncentral (tensor) forces in states of odd orbital angular momentum.