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184-inch cyclotron absorption cross sections accurate amplifiers amplitude angular distribution anticoincidence beam bremsstrahlung calibration center-of-mass system coefficients coincidence circuits coincidence unit COLLIMATOR computed Cornell counter telescope counting rate decay determined differential cross section differential range curve dispersion relation DISTRIBUTED AMPLIFIER effect electronics energies of 260 energy interval accepted energy-dependent evaluated experiment experimental cross sections Goldberger half-life curve Hewlett-Packard High-voltage plateau inches incident pions integral ion chamber ionization kinematical laboratory system lead scatterer liquid hydrogen target magnetic field mesons microcoulomb Moravcsik multiple scattering muons Mylar Nambu nucleon number of photons Perez-Mendez phase shifts photomultiplier tubes photon energy photon in accepted pion energy pion-nucleon scattering pions stopping positive photopion production positive pions positron background production from hydrogen region section for positive shown in Fig small-angle measurements small-angle telescope solid angle stopping scintillator synchrotron theory THICKNESS OF COPPER thin-walled trigger the gate triple coincidence utilized vacuum tank volts