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Détection hybride des rayons cosmiques d'ultra-hautes énergies avec l'Observatoire Pierre Auger

Abstract : Especially designed for a better understanding of the origin of the Ultra-High Energie Cosmic Rays (E>1019 eV), the Pierre Auger Observatory is now starting a period of data taking expected to last of 20 years. It will obtain enough statistics at the highest energies to determine wether or not the GZK cut-off exists. Using simultaneously two atmospheric shower detection techniques, the first at ground level and the second detecting the fluorescence light, it should make it possible to determine the energies as well as the arrival directions and nature of these particules with better accuracy.After an introduction covering the general properties of cosmic rays, the production mecanisms at the highest energies are presented. We then focus on one particular mechanism of production, considering the decay of ultra-heavy relic particules, the aim being to determine limits on the life-time of such particles. After having presented air-showers detection techniques and the Pierre Auger Observatory, we consider hybrid detection: hybrid simulation and analysis of hybrid laser shots have allowed us to evaluate the performance of this method. They also have made it possible to investigate the relative timing of both detectors which is essential for the considered technique. Finally, the data recorded during the Preproduction period have allowed us to check the precision of different detections:the surface detector alone, the fluorescence detector alone and the hybrid method. Thanks to these data, a preliminar comparison of energy values and an analysis of the arrival directions anisotropies have been done.
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Submitted on : Friday, December 10, 2004 - 3:28:27 PM
Last modification on : Wednesday, October 14, 2020 - 4:00:41 AM
Long-term archiving on: : Friday, April 2, 2010 - 8:37:54 PM


  • HAL Id : tel-00007717, version 1




Nathalie Playez. Détection hybride des rayons cosmiques d'ultra-hautes énergies avec l'Observatoire Pierre Auger. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université Joseph-Fourier - Grenoble I, 2004. Français. ⟨tel-00007717⟩



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