Electron-proton separation with a liquid argon-lead sandwich detector

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Abstract

A liquid argon-lead shower counter of 18.2 radiation lengths has been used ot detect showers induced by electrons and protons respectively. The detector consisted of six consecutive modules in which the longitudinal development of the shower was measured. Applying a ζ2-cut to the measured pulse heights, 0.15–1% of all protons fulfilled the criteria of an electron. The corresponding electron detection efficiencies were 50–70%.

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