Photoproduction of Charged Pions from Nuclei by 250-MeV Bremsstrahlung

Abstract

The energy spectra of photoproduced π⁺ and π⁻ from C, Al, Ca, and Cu have been measured at 90° in the laboratory system using 250-MeV bremsstrahlung. The pions were detected by a magnetic spectrometer. The π⁻⁄π⁺ yield ratios obtained from the measured spectra and the A-dependence of the cross sections are discussed as a function of the pion kinetic energy.