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Trigger and Aperture of the Surface Detector Array of the Pierre Auger Observatory

Journal Article · · Nucl.Instrum.Meth.A
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 $$3\times 10^{18}$$ eV, for all zenith angles between 0$$^\circ$$ and 60$$^\circ$$, 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.
Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Organization:
Pierre Auger
DOE Contract Number:
AC02-07CH11359
OSTI ID:
1872092
Report Number(s):
FERMILAB-PUB-10-094-A-PPD-TD; arXiv:1111.6764; oai:inspirehep.net:851168
Journal Information:
Nucl.Instrum.Meth.A, Journal Name: Nucl.Instrum.Meth.A Vol. 613
Country of Publication:
United States
Language:
English

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