Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-01-27
Astropart.Phys. 9 (1998) 331-338
Astronomy and Astrophysics
Astrophysics
15 pages, uses epsfig.sty with 6 figures. Submitted to Astroparticle Physics, 25th January 1998. This is a revised version (21
Scientific paper
10.1016/S0927-6505(98)00031-0
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. 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 and find that the agreement between the experiments is much improved. Under this model, both experiments measure a composition rich in iron around 10^17 eV which becomes lighter at higher energies. However, the agreement is not complete, which indicates scope for improvement of the interaction model, or perhaps the need for a re-examination of the experimental results.
Dawson Bruce R.
Meyhandan Rishi
Simpson K. M.
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