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The new Durham spectrograph MARS has been used to determine absolute intensities of cosmic ray muons in the near vertical direction with momenta above 3.48 and 7.12 GeV/c. The intensities are found to be close to those previously reported by Aurela and Wolfendale in 1967, the present intensities being higher by some (7.7 ± 1.3)% and (1.7 ± 1.4)%, at the respective momenta. Comparison is also made with the results of other recent measurements.
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Ayre et al. (1971) studied this question.
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