On Liquid Argon Ionization Chambers of Centimeter Size

Abstract

A parallel-plate chamber with electrode separation variable from 2 mm to 2 cm has been used to measure recombination, attachment, and energy resolution for beta-ray ionization in liquid argon. A collecting voltage up to 30 kv was used without introducing spurious pulses. Amplifier noise sets the lower limit to beta-ray detection at about 150 kev and limits the energy resolution to about 100 kev (full width at half maximum at any energy).