Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 19: Cosmic Ray 1

T 19.7: Vortrag

Montag, 21. März 2022, 17:50–18:05, T-H32

Measuring the muon content of inclined air showers using the radio and particle detector of the Pierre Auger Observatory* — •Marvin Gottowik for the Pierre Auger collaboration — Bergische Universität Wuppertal, Gaußstraße 20, 42119 Wuppertal

A first measurement of the muon content of an air shower using hybrid radio and particle detection is presented. For inclined air showers with zenith angles above 60 ^∘, the water Cherenkov detector (WCD) of the Pierre Auger Observatory performs an almost pure measurement of the muonic component, whereas the Auger Engineering Radio Array (AERA) reconstructs the electromagnetic energy independently using the radio emission of the air shower. The analysis of more than 6 years of AERA data shows a deficit of muons predicted by all current-generation hadronic interaction models for energies between 4 EeV and 20 EeV. This deficit, already observed with the Auger Fluorescence Detector, is now confirmed using for the first time radio data. The analysis is limited by low statistics due to the small area of AERA and the high energy threshold originating from the WCD reconstruction. With the AugerPrime Radio Detector currently being deployed, this analysis can be extended to the highest energies to allow for in-depth tests of hadronic interaction models with large statistics.

* Gefördert durch die BMBF Verbundforschung Astroteilchenphysik (Vorhaben 05A20PX1).