Dortmund 2021 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 46: Cosmic Rays II
T 46.4: Vortrag
Dienstag, 16. März 2021, 16:45–17:00, Tu
Determination of the muon deficit in air shower simulations using SD-AERA hybrid events detected with the Pierre Auger Observatory* — Marvin Gottowik and •Julian Rautenberg for the Pierre Auger collaboration — Bergische Universität Wuppertal, Gaußstr. 20, 42119 Wuppertal
The number of muons in extensive air showers is underpredicted by all current generation hadronic interaction models. For the first time, this muon deficit is determined using hybrid events that have been detected with the Auger Engineering Radio Array (AERA) and the Surface Detector (SD) of the Pierre Auger Observatory. Using a subset of 31 high quality events with primary energies between 6 EeV and 20 EeV and zenith angles between 60∘ and 80∘, that have been detected in more than 6 years of operation, a muon deficit of up to 40 % is found assuming a pure proton composition. Assuming a mixed composition of protons and iron reduces the deficit to about 15 %. The analysis is limited by low statistics due to the small area of AERA of only 17 km2 and by the high energy threshold originating from the SD reconstruction. Statistics will be increased by the Radio Upgrade of Auger which will measure thousands of events with energies up to 100 EeV. This will allow for the study of the mean number of muons, as well as their intrinsic spread, with vastly increased statistics and allowing for in-depth tests of hadronic interactions at energies much higher than those accessible with current accelerators.
*Supported by the BMBF Verbundforschung Astroteilchenphysik (Vorhaben 05A17PX1/05A20PX1)