Features of the spectral-angular distribution of gamma-quanta emitted by GeV electrons in a thick crystal

Abstract With the help of an original experimental technique based on the Compton scattering of gamma-quanta studies of the spectral-angular distributions of radiation generated when 1.2 GeV electrons pass through thick silicon crystals along crystals axes have been made. The features of the spectral-angular distributions of radiation of relativistic electrons in thick crystals predicted earlier are shown. Quantitative comparison of theoretical calculations and experimental data is performed. The features of the spectral-angular distributions of gamma-quanta observed in the experiment are shown to be due to the coherent mechanism of radiation in a crystal by above-barrier electrons.