Abstract
A compact sampling calorimeter is developed and used to measure the ratio between positive and negative muons in the cosmic-ray flux at momenta below 1 GeV/ c. The delayed coincidence method is used, based on the reduced mean lifetime of negative muons due to nuclear capture in matter. It is shown that aluminum is a good choice as a capture medium for negative muons and suitable for a simple detector set-up. The muon charge ratio is found to be 1.30±0.05 for a mean momentum of 0.86 GeV/ c and over a zenith angle acceptance with Θ mean=26°.
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