Abstract
A ring-imaging Cherenkov counter read out by a 100-channel PMT of active area 10 × 10 cm 2 was operated successfully in a test beam at the BNL AGS with several radiator gases, including the heavy fluorocarbon C 4F 10. Ring radii were measured for electrons, muons, pions and kaons over the particle momentum range from 2 to 12 GeV/ c, and a best resolution of σ r r = 2.3% was obtained.
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