Heidelberg 2022 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 7: Astrophysics

EP 7.3: Vortrag

Mittwoch, 23. März 2022, 16:45–17:00, EP-H1

Measurement of the mass composition of ultra-high energy cosmic rays at the Pierre Auger Observatory using a novel model based on air-shower universality — Markus Roth, David Schmidt, •Maximilian Stadelmaier, and Darko Veberic — KIT, Karlsurhe, Germany

We present a model of extensive air showers that is based on the implications of air-shower universality. The model comprises the spatial and temporal densities of particles expected from extensive air-showers induced by cosmic rays. Therewith, the depth of the shower maximum and the relative muon content of an air shower can be reconstructed solely from data collected by the surface detector of the Pierre Auger Observatory and the upgraded AugerPrime. Using these two observables, the logarithmic atomic mass of cosmic rays can be reconstructed on an event-by-event basis with sufficient accuracy to discriminate light from heavy primary particles. The method is calibrated using hybrid measurements from the surface detector and the fluorescence telescopes of Auger. Furthermore, we present results on the mass composition of ultra high-energy cosmic rays as estimated using the universality-based reconstruction.