The muon flux of cosmic rays at sea level

The sea-level absolute vertical integral cosmic ray muon intensities for three momenta near 1 GeV/c at 12 degrees N were measured with a range spectrometer. The results obtained from this measurement are used to derive the intensities at a latitude of 50 degrees N by applying the latitude correction suggested by Olbert (1954). The integral muon intensities are found to be on the average 3.5% lower and 21.6% higher than the values obtained by Allkofer et al. and Rossi respectively. The differential intensities derived from the integral ones are 20% higher than those calculated from Olbert at the same latitude. The results of the other recent measurements on the differential muon intensities in the low energy region in relation to a form spectrum are also discussed.