6533b85afe1ef96bd12b94b2

RESEARCH PRODUCT

Unitarity constraint for threshold coherent pion photoproduction on the deuteron

subject

description

The contribution of the two-step process {gamma}d{r_arrow}pn{r_arrow}{pi}{sup 0}d to the imaginary part of the amplitude for coherent pion production on the deuteron is calculated at threshold exploiting unitarity constraints. The result shows that this absorptive process is not negligible and has to be considered in an extraction of the elementary neutron production amplitude from the {gamma}d{r_arrow}{pi}{sup 0}d cross section at threshold. {copyright} {ital 1997} {ital The American Physical Society}