rho/sup + -/ photoproduction at 9. 6 GeV

rho/sup + -/ photoproduction from hydrogen and deuterium at 9.6 GeV is studied. The reactions ..gamma..p..-->..p/sup +/n and ..gamma..p..-->..p/sup -/..delta../sup + +/(1236) have cross sections much larger than expected from pion exchange alone. t distributions do not show the sharp forward peak characteristic of one-pion exchange contributions. Density matrices indicate an isotropic decay distribution. The ratio of rho/sup +/ to rho/sup -/ production on deuterium differs from unity and by the amount expected from interference between rho and A/sub 2/ exchanges. We conclude the ..pi.. exchange is unimportant for rho/sup + -/ photoproduction, and infer that rho exchange dominates. (AIP)