Deuteron photodisintegration up to 200 MeV. Pt. 1

We develop a theoretical model for deuteron photodisintegration by exploiting the identity connecting the matrix elements of the divergence of the internal-convection current density, the charge density for the nonrelativistic impulse approximation and the potential used to calculate the wavefunctions. This identity leads to a good approximation scheme for calculating the electric multipole amplitudes, which enables one-pion exchange to be treated consistently for both the electric and magnetic amplitudes. Full details are given of all the contributions to the multipole amplitudes which are taken into account in calculating the reaction observables. (orig.)