Abstract
As part of the upgrade of the Pierre Auger Observatory, the Auger Muons and Infill for the Ground Array (AMIGA) underground muon detector extension will allow for direct muon measurements for showers falling into the SD-750 array. We optimized the AMIGA muon reconstruction procedure by introducing a geometrical correction for muons leaving a signal in multiple detector strips due to their inclined angle of incidence and deriving a new unbiased parametrization of the muon lateral distribution function. Furthermore, we defined a zenith-independent estimator ρ35 of the muon density by parametrizing the attenuation of the muonic signal due to the atmosphere and soil layer above the buried detectors and quantified the relevant systematic uncertainties for AMIGA. The analysis of one year of calibrated data recorded with the prototype array of AMIGA confirms the results of previous studies indicating a disagreement between the muon content in simulations and data.
Highlights
Measurements of the Pierre Auger Observatory have led to major advances in our understanding of ultra-high energy cosmic rays
We report on recent improvements of the AMIGA muon reconstruction procedure, estimate the main systematic uncertainties and present first physics results for AMIGA that were obtained from the analysis of one year of data recorded with the prototype array
We described recent improvements of the AMIGA muon reconstruction procedure, estimated the main systematic uncertainties and presented first physics results from the AMIGA prototype array
Summary
Measurements of the Pierre Auger Observatory have led to major advances in our understanding of ultra-high energy cosmic rays. The key part of the AugerPrime upgrade is the installation of new plastic scintillation detectors on top of the existing water-Cherenkov detectors (WCD) of the surface detector (SD) array. The combined analysis of the signals of both the WCD and the new surface scintillator detectors (SSD) will allow for the disentangling of the electromagnetic and muonic shower components and provide additional measurements of mass composition-sensitive observables up to energies of the flux suppression region [1]. The so-called Auger Muons and Infill for the Ground Array (AMIGA) extension will provide direct measurements of the muon content of a sub-sample of extensive air showers falling onto the SD-750 array and serve for the verification and fine-tuning of the methods used to extract muon information from the combined SSD and WCD signals. We report on recent improvements of the AMIGA muon reconstruction procedure, estimate the main systematic uncertainties and present first physics results for AMIGA that were obtained from the analysis of one year of data recorded with the prototype array
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