Abstract

The contribution from the meson exchange current to the deuteron photodisintegration amplitude at threshold is calculated by taking into account the next nearby singularities beyond the nucleon exchange poles in the crossed channels. The procedure is based on potential theory. Starting with the corresponding fourth order Feynman amplitude with the deuteron-nucleon vertex on the mass shell a local “exchange potential” is derived. Its contribution to the amplitude is calculated by using the Hulthén function for the initial deuteron state (thus including the off-mass shell properties of the deuteron-nucleon vertex) and the effective range approximation for the final scattering state. The result is combined with the direct γ-nucleon contribution calculated by Austern and Rost 1) and agrees with experiment within the limits of error.

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