Backward-angle photoproduction of ω and η′ 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 $\eta'$ photoproduction from protons at backward angles ($-1.0 2.4$ GeV. A bumpstructure in the $\sqrt{s}$ dependence of the differential cross sections for $\ eta'$ mesonswas observed at $\sqrt{s}\sim$2.35 GeV.