The Proton-Proton Interaction

This paper presents a phenomenological analysis of the proton-proton scattering observed at 32 and 340 Mev in terms of static nuclear potentials. Comparison of these results with the neutron-proton scattering at 40, 90, and 280 Mev analyzed previously indicates that nuclear forces are not charge independent. In particular, there is definite evidence in the $n-p$ scattering data that but little scattering occurs in the odd parity states, whereas the high $p-p$ cross section apparently must be due to scattering in the (odd parity) triplet states. (This holds true even if velocity dependent spin orbit forces, i.e., $\sigma ·\mathbf{L}$, are included.)