Analysis of High Energy Proton Spectra by Means of a Stack of Photographic Plates

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Abstract
Stacks of photographic plates have been used to analyze the continuous spectrum of high energy protons emitted by a carbon target bombarded with γ‐rays from an electron synchrotron. The planes of successive plates in a stack lay at 30° to a line through plate and target centers, and the plates were interleaved with aluminum absorbers. The numbers of proton tracks per square cm in the emulsions of successive plates yield an integral spectrum of the protons. Protons with energies up to more than 120 Mev were present when the synchrotron was operated at 195 Mev. The effects of multiple scattering of the protons in the stacks are discussed, and it is shown how the tracks of protons originating from the target can be distinguished clearly from a background of randomly oriented tracks.

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