Backward-angle photoproduction of   and  ' mesons from protons in the photon energy range from 1.5 to 3.0 GeV

We report the measurement of differential cross sections for omega and ' photoproduction from protons at backward angles (-1.0 < C.MX < -0.8) using linearly polarized photons at E=1.5-3.0 GeV. The differential cross sections for omega mesons are larger than the predicted u-channel contribution based on amplitude analysis in the energy range 2.0{s2.4 GeV. The differential cross sections for omega and ' mesons become closer to the predicted u-channel contribution at {s > 2.4 GeV. A bump structure in the {s dependence of the differential cross sections for eta' mesons was observed at {s2.35 GeV.