The AMIGA Muon Counters of the Pierre Auger Observatory: Performance and Studies of the Lateral Distribution Function

摘要

The AMIGA enhancement (Auger Muons and Infill for the GroundArray) of the Pierre Auger Observatory consists of a 23.5 km2infill area where air shower particles are sampled by water-Cherenkov detectors at the surface and by 30 m2 scintillationcounters buried 2.3 m underground. The Engineering Array of AMIGA, completed since February 2015, includes 37 scintillator modules (290 m2) in a hexagonal layout. In this work, the muon counting performance of the scintillation detectors is analysedover the first 20 months of operation. Parametrisations of the detector counting resolution and the lateral trigger probability are presented. Finally, preliminary results on the observed muon lateral distribution function (LDF) are discussed.