Proton Blocking in Cubic Crystals

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Abstract
Photographic recording of low‐energy (∼100 keV) protons backscattered from thick bcc, fcc, and diamond cubic crystals has been used to obtain blocking patterns characteristic of crystal type. Photographs of blocking patterns symmetric about the [001] direction are presented, together with the corresponding standard linear (gnomonic) projections of the directions and planes of the crystals. The projections have been drawn to facilitate assignment of planar and directional indices corresponding to the lines and spots, respectively, of the blocking patterns for cubic crystals. Simple densitometric and visual measurements of the planar intensities and angular widths of the spots, as taken directly from nuclear emulsion film, or photographic enlargements, are shown to correlate with crystal structure.