Isolated high-energy electron showers in photographic emulsion have been investigated and have yielded the following conclusions: (1) out of 16 cases of isolated electron showers observed to originate from single electron pairs of energy greater than 1 Bev, 2 cases have been found to be anomalous in the sense that they seem to have been initiated by more than 2 photons; one of the two has been analyzed in detail. (2) The discrepancy between the experimental observations and theoretical predictions on the trident process found in a previous work has been obtained again with the additional experimental data of this experiment.
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Koshiba et al. (1955) studied this question.
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