Estimation of the sea level muon spectra at different zenith angles below 10 TeV energy

The moderate energy primary cosmic ray nucleon spectrum has been calculated from the direct measurements of Webber et al., Seo et al., and Menn et al. along with the other results surveyed by Swordy. Using these directly meas ured primary mass composition results all particle primary nucleon energy s pectrum has been constructed using superposition model to estimate the ener gy spectra of muons from the decay of the cosmic ray non-prompt and prompt mesons in the atmosphere. The Z-factors have been estimated from the CERN L EBC-EHS on the Lorentz invariant cross section results on pp --> pi X+/- an d pp --> K+/-X inclusive reactions and FNAL data on pi (+/-)p --> pi X+/- r eactions, and duly corrected for A-A collisions. Using these Z-factors the meson energy spectra in the atmosphere have been calculated. The sea level muon energy spectra at zenith angles 0 degrees, 45 degrees, 72 degrees, and 75 degrees have been derived from the decay of non-prompt mesons by adopti ng standard diffusion equation of hadronic cascades. The contribution of ch armed mesons to muon spectrum has also been accounted by adapting the conve ntional procedure. The derived differential sea level muon energy spectra f or energies less than or equal to 10 TeV have been found to follow the powe r law fits of the form N-mu(E) approximate to const. E-gamma. Our estimated muon energy spectra at zenith angles less than or equal to 75 degrees have been found comparable with the global spectrograph muon flux results of MA RS, DEIS, and MSU groups.