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Etude des rayons cosmiques ultra-énergétiques avec l'Observatoire Pierre Auger: de l'acceptance du détecteur à la nature des particules primaires et aux mesures d'anisotropies.

Abstract : The Pierre Auger Observatory, still under construction in Argentina, is designed to study the cosmic rays with energies above a few EeV. The experiment combines two complementary techniques: the fluorescence light detection and the sampling of the shower with an array of detectors at ground, covering a surface of 3000 square kilometers. The calculation of the acceptance of the detector, which is of utmost importance to establish the energy spectrum, has been achieved. The method of computation of the acceptance is simple and reliable. The detection efficiency depends on the nature of primary cosmic rays, allowing to study the cosmic rays composition with the surface detector. The calculation of the cosmic rays energy spectrum has been performed, using different methods to estimate the energy of the events. A cross calibration between the fluorescence and the surface detector provides an estimation of the energy almost independent of hadronic interaction models. The study of large scale anisotropies in the cosmic rays angular distribution provides useful informations about the cosmic rays sources and the conditions of propagation. A new analysis method is presented, allowing to estimate the parameters of an underlying dipolar and quadripolar anisotropy in the data. The method is applied to a preliminary Auger data set.
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https://tel.archives-ouvertes.fr/tel-00105431
Contributor : Julien Aublin <>
Submitted on : Wednesday, October 11, 2006 - 7:28:38 PM
Last modification on : Wednesday, September 16, 2020 - 3:59:37 PM
Long-term archiving on: : Tuesday, April 6, 2010 - 7:18:53 PM

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  • HAL Id : tel-00105431, version 1

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Julien Aublin. Etude des rayons cosmiques ultra-énergétiques avec l'Observatoire Pierre Auger: de l'acceptance du détecteur à la nature des particules primaires et aux mesures d'anisotropies.. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université Paris Sud - Paris XI, 2006. Français. ⟨tel-00105431⟩

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