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XV International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI 2008), Paris : France (2008)
AGASA energy spectrum and the GZK cut-off
J.-N. Capdevielle1, F. Cohen, B. Szabelska, J. Szabelski

We discuss primary CR energy estimations for very large surface EAS experiments. We show that the procedure of energy determination via the relation to particle densities at 600 m from the shower axis, ρ, requires a specific treatment for inclined cascades when the maximum of EAS development is close to the array. As follows from simulations and cascade theory, using an exponential function for ρ conversion from inclined to vertical showers is no longer valid and leads to an overestimate of the primary energy. We present a procedure to reconstruct the primary spectrum that can reduce the discrepancy between the results of fluorescence experiments and surface arrays.
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie

Physique/Astrophysique/Phénomènes cosmiques de haute energie