Abstract
Electromagnetic cascades in a lead-emulsion chamber have been studied to determine the effect of air gaps on the upstream sides of the emulsions. Such air gaps cause a change in the form of the radial distribution of electron tracks, making cascades appear older and giving incorrect energy estimates. The number of tracks remaining within a radius r was found to vary as exp(− g/ G), where g is the gap thickness. The characteristic gap thickness in mm is G = 3.04 + 1.30ln( Er 2GeV −1mm −2), where E is the energy of the initiating gamma ray. Use of this relation provides a significant correction to cascade-energy estimates and allows one to calculate the effect of different gap thickness on the energy threshold for visual detection of cascades.
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