Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....3.1050l&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
Scientific paper
Using the BESS 98 flight proton and alphaparticle spectra improves the agreement between our calculated sea level proton spectrum (25ICRC) and the measured sea level proton spectrum. We then calculate the atmospheric muon spectrum and charge ratio using models for pion and kaon production. The calculated sea level muon charge ratio exhibits a minimum at about 50 GeV for vertical muons; and at somewhat higher energy for near horizontal muons; due to decrease of the pi-pluss/pi-minus ratio before kaon decay increases the muon charge ratio at higher energies. Considering neutrinos assosiated with muons, we obtain the muon-neutrino intensity which we use to derive the neutrino -induced muon intensity underground. The charge ratio of neutrino-induced muons underground is found to have a maximum of 0.49 at about 10 GeV for vertical muons, and a maximum of 0.50 at about 200 GeV for hor izontal muons, approaching 0.40 at high energies.
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