Measurement of the mass composition of ultra-high-energy cosmic rays at the Pierre Auger Observatory
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et al.; Institute for Cosmic Ray Research (ICRR) Univeristy of Tokyo; International Union of Pure and Applied Physics (IUPAP); JPS; Nagoya Convention and Visitors Bureau; Nagoya University
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After nearly 20 years of data-taking, the measurements made with the Pierre Auger Observatory represent the largest collection of ultra-high-energy cosmic ray (UHECR) data so far assembled from a single instrument. Exploring this data set led to a deeper understanding of the UHECR flux and many surprises. In particular, studies aiming to investigate and leverage the mass composition of UHECRs have played an important role in empowering discovery. This contribution will present an overview of the analyses of primary mass composition carried out during the first phase of the Observatory. The overview includes analyses derived from measurements made by the surface, fluorescence, and radio detectors covering energies ranging from 0.1 EeV up to 100 EeV. Special attention will be given to recent advances and results to provide a complete picture of UHECR mass composition at the Observatory as it moves to its next phase, AugerPrime. Additionally, specific updates will be given to studies focusing on mass trends from surface detector rise-times, Xmax dependent anisotropies, and UHECR beam characterization using the correlation between Xmax and signal amplitudes at the ground. © Copyright owned by the author(s) under the terms of the Creative Commons.
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Cosmic ray detectors, Cosmic ray measurement, Cosmology, Photons, Cosmic ray flux, Data set, Detector rise time, Energy, Mass composition, Measurements of, Pierre Auger observatory, Primary mass, Surface detectors, Ultra high-energy cosmic rays, Cosmic rays
