## Photopion Production |

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255 Mev photons Absolute Cross Sections angle of 135 angle of 90 angular correlation curve angular distribution Approximate atomic number bremsstrahlung center of mass coincidence phosphors correlation function counting rates decay decrease Deuterium differential cross section distribution of neutral energy distribution excitation function experimental results gamma rays gamma-gamma coincidence high energy isobars kinematics kinetic energy laboratory angle liquid hydrogen Littauer and Walker magnetic moment mass differences mean free path measured minimum correlation angle negative pions negative to positive neutral pion disintegrations neutral pion energy neutral pion kinetic neutral pion production neutral pion velocity nuclear emulsion NUCLEAR MASS NUMBER observed angular correlation photon energy Photoproduction of Neutral pion photoproduction pion production angle pion production energies Pions from Beryllium Pions from Hydrogen plotted positive pion production positive ratio production cross sections production process rest mass spectrum steradian target nucleus telescope tive unpaired neutron versus Walker3 yield per nucleus yoke angle