Photoproduction of Neutral Pions from Hydrogen in the Region of the First Pion-Nucleon Resonance

The cross section for single ${\pi }^0$ photoproduction from hydrogen has been measured at nominal angles of 70°, 90°, 130°, and 180° for photon energies 220-400 MeV by detecting the recoil protons. The 180° measurements, taken with a new setup, avoid big corrections present in some of the previously published results. These new data allow a direct comparison with the experiment presented by the Bonn group and with the most recent theoretical predictions.