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Etude des neutrinos de ultra haute énergie à l'observatoire Pierre Auger

Abstract : The Pierre Auger observatory is an experiment dedicated to the detection of ultra high energy cosmic rays. This detector is composed of two different sub-detectors which complement each other to offer the greatest potential for the study of ultra high energy cosmic rays ever achieved.. The observatory is also sensitive to ultra high energy neutrinos, though it was not designed in that goal. During this thesis, a simulation software has been developed to study the propagation and interaction of tau neutrinos in the Earth crust, a work needed in the study of the first detection channel, in which tau neutrinos graze the Earth just below the horizon and interact inside the Earth crust, just below the detector. In addition to the conversion probability needed to compute the detector acceptance to such neutrinos, the program allowed the study of some specific features linked to the propagation of the particles inside the rock, giving a better understanding ot their impact on the overall result. The second part of the work deals with neutrinos interacting directly inside the atmosphere, like classic cosmic rays do. For this second channel, a selection criterion has been developed through the comparison of simulated ultra high energy neutrino showers with respect to the reaw data collected by the detector. The study of neutrinos inside the Pierre Auger collaboration allowed to derive two limits to the diffuse flux of ultra high energy neutrinos at energies around 1 EeV.
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https://tel.archives-ouvertes.fr/tel-00451532
Contributor : Kévin Payet <>
Submitted on : Wednesday, February 3, 2010 - 9:17:04 AM
Last modification on : Thursday, November 19, 2020 - 12:58:50 PM
Long-term archiving on: : Thursday, September 23, 2010 - 11:16:31 AM

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  • HAL Id : tel-00451532, version 2

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IN2P3 | LPSC | CNRS | GEPI | UGA

Citation

Kévin Payet. Etude des neutrinos de ultra haute énergie à l'observatoire Pierre Auger. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université Joseph-Fourier - Grenoble I, 2009. Français. ⟨tel-00451532v2⟩

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