Lateral distribution of muon pairs in underground cosmic ray showers

Abstract
The lateral distribution of cosmic-ray muon showers underground has been studied by measuring the separations between about 5000 pairs of muons. Results are presented in terms of a counting rate for an equivalent pair of one metre-square detectors beneath 2500 hg cm-2 rock and orientated at 45 degrees zenith. For separations from 0 to 50 m an approximately exponential dependence of the counting rate on detector separation is observed which decreases by a factor e in of the order of 10 m.
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