A Comparison of Cosmic Ray Composition Measurements at the Highest Energies

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  • 27 January 1998
Abstract
In recent years the Fly's Eye and Akeno groups have presented analyses of the cosmic ray mass composition at energies above 10^17 eV. The experiments employ different mass composition parameters - for the Fly's Eye it is X_max, the depth of maximum shower development, and for Akeno it is the muon content of showers at fixed energy. While the analysis of the Fly's Eye group points to a likely change in mass composition from heavy to light at energies above 10^18 eV, the Akeno analysis favours an unchanging composition. However, the two groups base their conclusions on simulations using quite different hadronic models. Here we present a comparison of the experiments using the same hadronic model.

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