Effect of atomic arrangement on penetration of charged particles into crystals

The angular and spectral distributions of protons having initial energies of 4–7 MeV have been studied in simple cubic ionic crystals and in germanium and silicon crystals with and without the channeling effect. The average energy losses of the channeled and unchanneled protons in the crystals were measured. The concentration of structural defects in the crystals is shown to affect the proton energy spectra measured when channeling occurs. A procedure involving photographic plates was used to study the angular distributions of the channeled protons. The possible use of proton diffraction to study the structure and other characteristics of crystals is discussed.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii Fizika, No. 8, pp. 86–91, August, 1969.