The arrival directions and mass composition of cosmic rays above 10 exp 18 eV

Computer Science

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Cosmochemistry, Energy Spectra, Galactic Cosmic Rays, Mass Distribution, Anisotropy, Wide Angle Lenses

Scientific paper

Data on the arrival direction distribution and mass composition of cosmic rays above 10 exp 18 eV are briefly reviewed. There is no compelling evidence for wide-angle or point-source-like anisotropies and the mass composition above 10 exp 17 eV is constant to at least 5 x 10 exp 18 eV: a mixture of protons and Fe nuclei can describe the data. There is weak evidence that the mean mass increases above 5 x 10 exp 18 eV but, as with this and with the arrival direction problem, a vastly greater and better data set is required. This could come from an instrument with an aperture of 10 exp 4 sq km sr.

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