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Docta Complutense author Arqueros Martínez, Fernando author Blanco Ramos, Francisco author García Pinto, Diego author Ortiz Ramis, Montserrat author Rosado Vélez, Jaime author Vázquez Peñas, José Ramón 2023-06-20T04:17:57Z 2023-06-20T04:17:57Z 2010-01-21 0168-9002 10.1016/j.nima.2009.11.018 https://hdl.handle.net/20.500.14352/45142 http://dx.doi.org/10.1016/j.nima.2009.11.018 http://www.sciencedirect.com/ The surface detector array of the Pierre Auger Observatory consists of 1600 water-Cherenkov detectors, for the study of extensive air showers (EAS) generated by ultra-high-energy cosmic rays. We describe the trigger hierarchy, from the identification of candidate showers at the level of a single detector, amongst a large background (mainly random single cosmic ray muons), up to the selection of real events and the rejection of random coincidences. Such trigger makes the surface detector array fully efficient for the detection of EAS with energy above 3 x 10(18) eV, for all zenith angles between 0 degrees and 60 degrees, independently of the position of the impact point and of the mass of the primary particle. In these range of energies and angles, the exposure of the surface array can be determined purely on the basis of the geometrical acceptance. (C) 2009 Elsevier B.V. All rights reserved. eng Trigger and aperture of the surface detector array of the Pierre Auger Observatory journal article URL https://docta.ucm.es/bitstreams/776f99dd-0f5d-4fb7-98e6-46b0ac0df0e1/download File MD5 ca5f24a87bba3f84dd5ca1bd3d9bed5c 444920 application/pdf pastor-Trigger and Aperture.pdf