Nonlocality and the radius of the deuteron

We consider the effects of nonlocality on the determination of the deuteron radius for model potentials. We show that the relation between the model values for the radius and the scattering length which holds for local potentials is not necessarily valid for nonlocal potentials. It is possible for nonlocal potential models to produce a deuteron of smaller radius as required by experimental data. In particular, we show that the Reid model can be amended with the inclusion of an attractive separable term to produce a change in the radius which is of the correct order of magnitude.