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Etude des rayons cosmiques d'ultra-haute énergie avec l'Observatoire Pierre Auger : de l'extraction du signal à l'interprétation du spectre en énergie

Abstract : The origin and the composition of the cosmic rays, almost one century after their discovery, remain an open question. Results of some experiments dedicated to their detection are even contradicting themselves at energies above 10¹⁸ eV. At these energies, the flux of the cosmic rays reaching the Earth is so low that direct detection is unthinkable in a reasonable time scale. The collaboration Pierre Auger has thus built, in the Argentine Pampa, an observatory covering an area of 3000 km² to determine the energies, masses and arrival directions of cosmic rays. Deployed detection techniques make the Pierre Auger Observatory a reference in the field of Ultra-High Energy. During the three years of my thesis, I had the chance to study the detection methods deployed by this experiment, focusing on its surface detector from the extraction of its signal to the reconstruction of the arrival direction and energy of the cosmic ray, which are presented in this manuscript along with the optimizations developed. The energy spectrum of cosmic rays is then reconstructed. The study of this spectrum, combined with the observables of composition, deduced from the fluorescence detector, allows its interpretation in term of mass. Acceleration and propagation models in Galactic or extragalactic environment can then be constrained by this combined study.
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Submitted on : Wednesday, October 17, 2018 - 10:01:10 AM
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Quentin Luce. Etude des rayons cosmiques d'ultra-haute énergie avec l'Observatoire Pierre Auger : de l'extraction du signal à l'interprétation du spectre en énergie. Phénomènes cosmiques de haute energie [astro-ph.HE]. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLS253⟩. ⟨tel-01897352⟩

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