Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....6.2381k&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
We have been observing the atmospheric gammaray spectrum from 30 GeV to 10 TeV for many years with the emulsion chamber at balloon altitude. Atmospheric gamma rays at high altitude of several g/cm2 are almost produced by a single interaction of primary cosmic rays, and useful to interpret the various cosmic-ray phenomena inside the atmosphere. Especially, more conclusive understanding for the cosmic-ray transport inside the atmosphere is desirable to estimate the absolute flux of atmospheric neutrinos. This estimation is important for the detailed analysis of neutrino oscillation experiments particularly at high energy side. Since charged pions are produced almost two times of neutral pions, we estimate the muon flux at high altitude reliably from our observed gamma-ray spectrum without referring to the primary cosmic-ray flux or hadronic interaction models. We can also estimate the primary flux of cosmic rays, referring to an appropriate hadronic interaction model. Proton spectrum estimated by our observed gamma-ray spectrum covers the energy range from 400 GeV to 30 TeV filling a gap in the currently observed proton spectrum.
Kobayashi Tatsuo
Komori Yosuke
Nishimura Jun
Yoshida Koji
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