Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-09-30
Phys.Rev.D74:083511,2006
Astronomy and Astrophysics
Astrophysics
13pages, 11 figures. Accepted for publication in PRD
Scientific paper
10.1103/PhysRevD.74.083511
We have observed atmospheric gamma rays from 30GeV to 8TeV, using emulsion chambers at balloon altitudes, accumulating the largest total exposure in this energy range to date, SOT ~ 6.66m^2.sr.day. At very high altitudes, with residual overburden only a few g/cm^2, atmospheric gamma rays are mainly produced by a single interaction of primary cosmic rays with overlying atmospheric nuclei. Thus, we can use these gamma rays to study the spectrum of primary cosmic rays and their products in the atmosphere. From the observed atmospheric gamma ray spectrum, we deconvolved the primary cosmic-ray proton spectrum, assuming appropriate hadronic interaction models. Our deconvolved proton spectrum covers the energy range from 200GeV to 50TeV, which fills a gap in the currently available primary cosmic-ray proton spectra. We also estimated the atmospheric muon spectrum above 30GeV at high altitude from our gamma-ray spectrum, almost without reference to the primary cosmic rays, and compared the estimated flux with direct muon observations below 10GeV.
Kobayashi Tatsuo
Komori Yosuke
Nishimura Jun
Ohmori Rie
Sato Yuzuru
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