## Photopion production |

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255 Mev photons ABSOLUTE CROSS SECTION angle of 135 angle of 90 angular correlation curve angular distribution Approximate atomic number bremsstrahlung center of mass charged pion coincidence counting coincidence phosphors correlation function decrease Deuterium differential cross section distribution of neutral energy distribution excitation function exclusion principle experimental results Figure gamma rays high energy kinematics kinetic energy laboratory angle liquid hydrogen Littauer and Walker mass differences mean free path measured minimum correlation angle negative pions negative to positive neutral pion energy neutral pion kinetic neutral pion production neutral pion velocity nuclear absorption nuclear emulsion NUCLEAR MASS NUMBER nucleon observed angular correlation photon energy Photoproduction of Neutral pion photoproduction pion production angle Pion production energies Pions from Beryllium Pions from Hydrogen pionso plotted positive pion production positive ratio production cross sections Radiation Laboratory rest mass SCINTILLATION COUNTERS spectrum steradian target nucleus0 Figo telescope tive unpaired neutron yield per nucleus yoke angle