Freiburg 2008 – scientific programme
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T: Fachverband Teilchenphysik
T 84: Kosmische Strahlung IV
T 84.5: Talk
Thursday, March 6, 2008, 17:50–18:05, KGI-HS 1199
Analysis of the muon spectra for inclined air showers measured with the KASCADE-Grande experiment — •Juan Carlos Arteaga-Velazquez for the KASCADE-Grande collaboration — Institut für Experimentelle Kernphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany
The solving of the mystery of the second knee in the cosmic ray spectrum is one of the main objectives of the KASCADE-Grande observatory. KASCADE-Grande is a ground array composed of different subsystems of detectors that, as a whole, allows to study simultaneously the electromagnetic and penetrating component of cosmic ray air showers in the energy range between 100 TeV and 1 EeV. Vertical showers (with zenith angles below 40o) are studied in detail at KASCADE-Grande. Now, the analyses are being extended to higher zenith angles as a way to study the muon content of air showers and to increase the statistics of the experiment.
In this talk, the muon spectra reconstructed for vertical and inclined air showers measured by the KASCADE-Grande observatory are presented and also confronted with Monte Carlos simulations based on the hadronic interaction models QGSJET II and EPOS. In addition, the result of the analysis of the observed spectra with the “constant intensity cut method” is shown. This method was applied in a first attempt to understand the origin of a systematic discrepancy found between the predicted and measured muon spectra, which increases with the zenith angle.