π0Production Cross Section for 430-Mev Protons on H and Be

The differential cross section for the production of photons in the forward direction by the reaction (430-Mev $p+H\to p+p+{\pi }^0$; ${\pi }^0\to 2\gamma$) is measured as 0.20×${10}^{-27\mathrm{}}$ ${\mathrm{cm}}^2$/sterad. The ratio of total to differential gamma cross section does not depend strongly on the symmetry of pion emission. Using an average calculated ratio, we find the pion-production cross section from hydrogen to be 0.45×${10}^{-27\mathrm{}}$ ${\mathrm{cm}}^2$.