Muon fluxes derived from the directly measured primary cosmic-ray elemental spectra using hadron-proton machine interaction results.

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Cosmic Rays: Muons, Cosmic Rays: Spectra

Scientific paper

The directly measured elemental spectra of primary cosmic rays obtained from JACEE, MSU, SOKOL and CRN data on p, He, CNO, Ne-S and Fe fluxes have been considered for the calculation of elemental nucleon spectra at the top of the atmosphere. Treating these spectra as parents of the secondary mesons, the sea-level muon fluxes at zenith angles 0° and 89° from each species have been derived using Z-factors based on the FNAL cross-section data for meson production and duly corrected for A-A collisions. The conventional muon spectra at 0° and 89° estimated from the individual elemental spectra and the prompt muon contribution arising from the charmed meson decays have been found comparable with the directly measured muon fluxes. The muon spectra derived from the primary nucleon spectrum with a constant spectral index of value -2.73 are found in approximate agreement with the present results.

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