Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-09-22
Astropart.Phys.13:137-150,2000
Astronomy and Astrophysics
Astrophysics
29 pages including 10 figures Accepted for publication by Astroparticle Physics, 17th Sept. 1999
Scientific paper
10.1016/S0927-6505(99)00117-6
The small change in the spectral slope of the overall intensity of cosmic rays near 1 PeV may be associated with the endpoint energy of supernova shock acceleration. A crucial test of this connection and other ideas of the origin of the spectral `knee' is the reliable determination of the variation of elemental composition in this region. Recent measurements at the DICE/CASA/MIA air shower installation in Dugway, Utah, USA have provided several independent air shower parameters for each event. The derivation of elemental composition from a combination of Cherenkov size, depth of shower maximum in the atmosphere, muon size and electron size at ground level and the reliability of these results are discussed. There is no evidence from these data for a large change in the mean mass of cosmic rays across the `knee'. These measurements show the cosmic rays are composed of ~ 70% protons and alpha-particles near total energies of 10PeV.
Kieda David B.
Swordy Simon P.
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