Composition Studies with the Pierre Auger Observatory
Michael Unger (for the Pierre Auger Collaboration)

TL;DR
This paper discusses how the Pierre Auger Observatory measures the composition of ultra high energy cosmic rays using fluorescence and surface detectors, focusing on the average shower maximum and mass-sensitive parameters.
Contribution
It introduces methods for analyzing cosmic ray composition through longitudinal profiles and surface detector data, providing new insights into ultra high energy cosmic rays.
Findings
Measurement of average shower maximum as a function of energy
Identification of mass-sensitive parameters from surface detector data
Enhanced understanding of cosmic ray composition at ultra high energies
Abstract
We report on studies of the composition of ultra high energy cosmic rays with the Pierre Auger Observatory. The detection of longitudinal air shower profiles with the fluorescence detector is described and the measurement of the average shower maximum as a function of energy is presented. Furthermore, mass sensitive parameters that can be obtained from the observatory's surface detector data are discussed.
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