Abstract
A directional effect on showering of 20 to 100 GeV electrons and positrons in a thick Si crystal has been found when the particle flight line is parallel to the ⟨111⟩ crystal axis within a few milliradians. In these conditions an average of 12 or more photons are emitted in the first tenths of radiation length of crystal. It is shown, using crystals, that it is possible to realize a compact detector to distinguish high energy electrons aligned in a well defined direction from a random incoming electron.
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