Speaker
Dr
Alexey Yushkov
(University of Siegen)
Description
We report for the first time on the measurement of the correlation between the depth of shower maximum and the signal in water-Cherenkov stations for events reconstructed by both the fluorescence and surface detectors of the Pierre Auger Observatory. Such a correlated measurement is a unique feature of a hybrid air shower observatory and allows us to determine the purity of the cosmic-ray composition. The observed correlation in the energy range around the ``ankle'' $\lg(E/\text{eV})=18.5-19.0$ differs significantly from the expectations for pure beams for all current hadronic models, indicating that the primary composition in this range is not pure but mixed.
| Registration number following "ICRC2015-I/" | 696 |
|---|---|
| Collaboration | Pierre Auger |
Author
Dr
Alexey Yushkov
(University of Siegen)
