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AGASA energy spectrum and the GZK cut-off

J.-N. Capdevielle 1 F. Cohen B. Szabelska J. Szabelski
1 APC - AHE - APC - Astrophysique des Hautes Energies
APC (UMR_7164) - AstroParticule et Cosmologie, Dipartimento di Astronomia, Universita degli Studi di Bologna
Abstract : 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simulations and cascade theory, using an exponential function for ρ conversion from inclined to vertical showers is no longer valid and leads to an overestimate of the primary energy.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.
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Submitted on : Tuesday, September 11, 2012 - 2:19:01 AM
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J.-N. Capdevielle, F. Cohen, B. Szabelska, J. Szabelski. AGASA energy spectrum and the GZK cut-off. XV International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI 2008), Sep 2008, Paris, France. pp.231-234, ⟨10.1016/J.NUCLPHYSBPS.2009.09.043⟩. ⟨in2p3-00730721⟩



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