Bonn 2020 – scientific programme
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T: Fachverband Teilchenphysik
T 102: Cosmic rays V
T 102.5: Talk
Friday, April 3, 2020, 12:00–12:15, L-3.001
Estimation of the mass composition of ultra-high energy cosmic rays with the Pierre Auger Observatory — •Olena Tkachenko for the Pierre Auger collaboration — Institute for Nuclear Physics, Karlsruhe Institute of Technology, Karlsruhe, Germany
The mass composition of ultra-high energy cosmic rays (UHECRs) is of crucial importance for the understanding their origin. One of the most robust techniques for estimation of the mass composition is based on the depth of atmospheric shower maximum, Xmax, as measured by the fluorescence detectors of the Pierre Auger Observatory.
In this talk we present a study of the composition of UHECRs from the Xmax distributions using the Markov Chain Monte Carlo (MCMC) algorithm. We estimate the fractions of different mass groups as a function of energy and we discuss the corresponding statistical and systematic uncertainties.