Charged Component of 1-GeV Electron Showers in Lead

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Abstract
Electron showers from 1-GeV electrons incident on 1-10 radiation lengths of lead have been observed in a streamer chamber placed in a magnetic field. The experimental technique was essentially 100% efficient in delineating showers containing either zero or many charged shower particles, permitting a significant increase in accuracy over previous experimental results on shower development. Results are presented for the number of shower electrons present having energies above 5-, 10-, and 25-MeV cutoffs. The data presented have typical errors of about 6% and show good agreement with the results of recent Monte Carlo calculations.