Interaction current effects in proton-neutron bremsstrahlung

A phenomenological interaction current density is used to investigate the effect on non-minimal coupling on np bremsstrahlung when the np interaction is nonlocal. The interaction current density depends upon a parameter which varies so that in one limit minimal coupling obtains and for other values of the parameter non-minimal couplings due to exchanges of charged particles of various masses are simulated. It is shown that for small photon energies minimal coupling is a good approximation. At higher energies, the effect on the matrix element is studied for several nucleon interactions. We find that the electric current part of the cross section may vary by as much as 10% depending on the type of coupling used. This result has implications in considering the extent to which bremsstrahlung experiments can discriminate between different N-N interaction models. NUCLEAR REACTIONS p-n bremsstrahlung; dependence on structure of interaction currents; calculation matrix elements.