Speaker
Description
The Pierre Auger Observatory has provided an unprecedented view of ultra-high-energy cosmic rays over the past two decades, combining a 3000 km² surface detector array with fluorescence telescopes to measure the energy spectrum, arrival directions, and composition of the most energetic particles in the Universe. These measurements have revealed a rich and increasingly detailed astrophysical picture, while also exposing persistent tensions between air-shower observations and hadronic interaction models. A central challenge for the field is now the determination of the mass of individual primary particles with high statistics, achievable only with the large exposure of the Auger surface array. Access to mass-sensitive observables requires the separation of the electromagnetic and muonic components of extensive air showers. This goal drives the AugerPrime upgrade, which transforms the Observatory into a multi-hybrid detector. Scintillator and radio detectors have been added to the existing water-Cherenkov stations, the dynamic range has been extended using small photomultiplier tubes, and station electronics have been upgraded to improve timing and signal resolution. In addition, underground muon detectors have been deployed in a denser sub-array. In this contribution, we present the performance of the upgraded detector and the current status of data analysis with AugerPrime.
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