Abstract
This paper reports observations of the absolute momentum differential fluxes of negative pions and muons between 4 and 15 GeV/c and between 0.3 and 15 GeV/c, respectively, at an atmospheric depth of 5 g . The data have been collected by the balloon-borne experiment MASS (matter - antimatter space spectrometer) launched from Prince Albert (Canada) where the geomagnetic cut-off is 650 MV/c. The instrument was flown on the 5th of September 1989, the duration of the flight was 5.5 hours at an altitude of more than 117 000 ft. The measured fluxes are compared to calculations. The muon spectrum follows a power law in momentum with a spectral index of 2.36 above 2 GeV/c.
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More From: Journal of Physics G: Nuclear and Particle Physics
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