Properties of the charged photopion production operator and the /sup 2/H(. gamma. ,. pi. /sup +/)2n cross section

Threshold photopion production from the proton and the deuteron is calculated with the ..gamma..N..pi.. amplitudes of Blomqvist and Laget. The epsilon-circumflexxsigma-arrow-right operator is found to dominate both cross sections up to 60 MeV above threshold. The results show agreement with recent /sup 2/H(..gamma..,..pi../sup +/)2n measurements.