Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 15: Kosmische Strahlung 1

T 15.8: Vortrag

Montag, 27. März 2017, 18:30–18:45, H 3

Mass discrimination using air shower universality at the Pierre Auger Observatory — •Ariel Bridgeman, Alexander Schulz, and Markus Roth for the Pierre Auger collaboration — Karlsruhe Institute of Technology, Karlsruhe, Germany

Data from the Pierre Auger Observatory's surface detector is used to study the primary composition of cosmic rays at the highest energies. Updates to a reconstruction based on the paradigm of air shower universality have reduced the bias in and improved the resolution of reconstructed mass-sensitive variables--namely, the depth of shower maximum and number of muons. By fitting measured distributions of those variables to predictions from various hadronic interaction models, we examine the implied composition and derive the multiplicative shift needed to correct for the deficit of the number of muons found when comparing simulations to data. Systematic uncertainties stemming from the measurements of the surface and fluorescence detectors are detailed. Initial studies involving the enrichment of a light sample for anisotropy purposes are also shown.

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