Photo-protons from beryllium irradiated with intermediate energy bremsstrahlung

Abstract

Data on the differential cross-sections for the emission of photo-protons fi-om beryllium irradiated with bremsstrahlung of various end-point energies up to a maximum of 600 MeV are presented and discussed. Particular attention has been paid to the photon energy-region around 150 MeV, where a dip in the total cross-sections for photon absorption has been reported. No evidence of anomalous structure is observed. The data are compared with the predictions of the intra-nuclear cascade model PICA. Good fits can be obtained with a value of 7.2 _ 1.0 for the quasi-deuteron constant.