Isospin nonconservation in theN−Ninteraction

Abstract

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.