Bonn 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Bonn musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

T: Fachverband Teilchenphysik

T 85: Cosmic rays III

T 85.6: Vortrag

Donnerstag, 2. April 2020, 17:45–18:00, L-3.002

Analysis of photon-like airshowers measured by the Pierre Auger Observatory — •Jannis Pawlowsky for the Pierre Auger collaboration — Bergische Universität Wuppertal

The Pierre Auger Observatory is the largest experiment measuring ultra high energy cosmic rays. It is sensitive to the type of the primary particle because of their different shower development in the atmosphere. This yields the experiment the most sensitive detector for photons and neutrinos at energies above the EeV range.
For this search of photons, the full duty cycle of the Surface Detector is used. The detectors are sensitive to separate the electromagnetic and hadronic shower component by the lateral distribution of the station signals as well as shape of the signals. Based on this, observables are combined in a principal component analysis resulting in a photon-like parameter. In this, the distributions for hadrons and photons are well separated. Using a threshold corresponding to 50% photon detection efficiency photon candidates can be selected. Applied to the full data-set, candidates in the tail of the data-distribution have been found.
Testing a hadron hypothesis, protons with the event-geometry of the candidates have been simulated to study the effect of the shower-to-shower fluctuations. A small fraction of simulated hadronic showers is further studied for their specific properties that are responsible for the photon-like air shower development. First results for the characterization of the photon-like hadronic showers are presented.
*Gefördert durch die BMBF Verbundforschung Astroteilchenphysik (Vorhaben 05A17PX1)