Aperture calculation of the Pierre Auger Observatory surface detector

D. Allard , E. Armengaud (1) , I. Allekotte , J. Aublin (2) , X. Bertou , A. Chou , P.L. Ghia , M. Gomez Berisso , J.C. Hamilton (3) , I. Lhenry-Yvon (2) , C. Medina , G. Navarra , E. Parizot (2) , A. Tripathi

1 APC (UMR_7164) - AstroParticule et Cosmologie
2 IPNO - Institut de Physique Nucléaire d'Orsay
3 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies

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.

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Astrophysique [astro-ph]

D. Allard, E. Armengaud, I. Allekotte, J. Aublin, X. Bertou, et al.. Aperture calculation of the Pierre Auger Observatory surface detector. 29th International Cosmic Ray Conference, ICRC 2005, Aug 2005, Pune, India. International Union of Pure and Applied Physics, pp.71-74, 2005. ⟨in2p3-00025191⟩