The COMET Phase-alpha Range Counter, built from thin plastic scintillators and a copper absorber, achieves over 99.9% muon-trigger efficiency and was shown by simulation to count decay-in-orbit electrons with roughly 47% acceptance and 60% purity.
Sumi, et al., IEEE Trans
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Development of the Range Counter for the COMET Phase-$\alpha$ Experiment
The COMET Phase-alpha Range Counter, built from thin plastic scintillators and a copper absorber, achieves over 99.9% muon-trigger efficiency and was shown by simulation to count decay-in-orbit electrons with roughly 47% acceptance and 60% purity.