Isospin nonconservation in the N-N interaction

A relativistic formalism of the N-N scattering including the electromagnetic contributions is presented. Relativistic electro- magnetic phase shifts are defined and evaluated. The difference between the nuclear phase shifts of the p-p and n-p interactions is evaluated taking into account the interference between strong and Coulomb forces, electromagnetic n-p contributions and the mass differences between the charged and neutral pions. The n-p interaction is described with the aid of six amplitudes. Neutron- proton observables are calculated with these six amplitudes. The mixing angle of the singlet-triplet transitions is evaluated. Experiments which should show these transitions are discussed. NUCLEAR REACTIONS N-N interaction, electromagnetic effects, isospin non-conservation.