Freiburg 2008 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 84: Kosmische Strahlung IV
T 84.3: Vortrag
Donnerstag, 6. März 2008, 17:20–17:35, KGI-HS 1199
The azimuthal asymmetry of particle lateral density in EAS in the range of observation of KASCADE-Grande — •Octavian Sima1, Heinigerd Rebel2, Claudia Morariu1, Christian Manailescu1, Gabriel Toma3, and Andreas Haungs2 — 1Department of Physics, University of Bucharest, Romania — 2Institut für Kernphysik, Forschungszentrum Karlsruhe — 3National Institute of Physics and Nuclear Engineering, Bucharest, Romania
The reconstruction of high-energy air showers (EAS) on the basis of ground level particle detectors is based on the characteristics of observables like particle lateral density (PLD), arrival time signals etc. Lateral densities, inferred from detector data, are usually parameterized by applying various lateral distribution functions (LDF). Typical LDFs anticipate azimuthal symmetry of PLD around the shower axis. The deviations from symmetry are important in the case of arrays like Grande, which only sample a small part of the azimuthal dependence.
In this contribution we discuss the origin of the asymmetry, its magnitude and propose procedures to incorporate it in the shower reconstruction. Geometric and attenuation effects (for inclined showers) and the earth magnetic field contribute to the asymmetry. The azimuth dependence of the energy deposit per particle does not impact on the real PLD, but affects the reconstructed PLD. Based on studies of CORSIKA simulations we propose procedures for minimizing the effects of the azimuthal asymmetry of PLD in shower reconstruction.