Abstract
The angular distribution and vertical intensity of cosmic-ray muons have been measured at depths of 71.6, 734, 1068 and 2235 hg cm-2 of standard rock. The angular distribution was fitted by a law of the form Itheta =Iv cosn theta and values of the exponent n were found to be 1.8+or-0.1, 2.1+or-0.1. 2.3+or-0.1 and 3.6+or-0.2 respectively. The corresponding vertical intensities were found to be (5.00+or-0.17)*10-4, (3.12+or-0.15)*10-6, (1.03+or-0.04)*10-6 and (9.7+or-0.5)*10-8 cm-2 s-1 sr-1 respectively. From a survey of all previous measurements best estimates of the n-depth and intensity-depth curves are derived. The results are explicable entirely in terms of pion and kaon decay for the origin of the muons and do not agree with the direct muon production hypothesis advanced by Bergeson et al. (abstr. A15886 of 1968).
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