Aperture calculation of the Pierre Auger Observatory surface detector
D. Allard, I. Allekotte, E. Armengaud, J. Aublin, X. Bertou, A. Chou, P. L. Ghia, M. Gómez Berisso, J. C. Hamilton, I. Lhenry-Yvon, C. Medina, G. Navarra, E. Parizot, A. Tripathi
Abstract
We determine the instantaneous aperture and integrated exposure of the surface detector of the Pierre Auger Observatory, taking into account the trigger efficiency as a function of the energy, arrival direction (with zenith angle lower than 60 degrees) and nature of the primary cosmic-ray. We make use of the so-called Lateral Trigger Probability function (or LTP) associated with an extensive air shower, which summarizes all the relevant information about the physics of the shower, the water tank Cherenkov detector, and the triggers.
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