Spectra of the energy losses experienced by 31 GeV electrons due to emission of radiation in a silicon single crystal

An investigation was made of the spectra of radiative energy losses experienced by a 31 GeV electron beam with a considerable angular divergence after passing through a single crystal of silicon positioned at various angular orientations. In the range of relatively large angles between the direction of the electron beam axis and a crystallographic axis the experimental results agreed with the well-known relationship describing the cross section of coherent bremsstrahlung in a single crystal. The results disagreed for small angles between such axes and this was clearly due to the process of spontaneous emission of radiation as a result of channeling of a greater proportion of electrons in the single crystal.