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Production et propagation de noyaux légers d'antimatière dans la galaxie

Abstract : In this thesis, the flux of light antinuclei induced near earth by Cosmic Ray interactions with the interstellar matter in the galaxy is calculated. A good knowledge of this secondary galactic contribution is required for a significant search of primordial antimatter in the universe. Furthermore, antiprotons and antideuterons production in neutralino annihilation has been considered as a possible signature of the Dark Matter constituents in the universe. They have also been considered as evaporation products of primordial black holes. Their flux at Earth have been calculated in the perspective of searching for a possible signature of the source in the experimental spectra. A common feature of these studies is that the calculated fluxes are extremely small in intensity and peaked at low energy. The detection of these fluxes requires also a good knowledge of the secondery production background. Our estimation of the antiproton flux is in general agreement with the others one even if some differents appear. Its come from especially of a new evaluation of antiproton cross section production. The antideuteron flux obtained in this work is more higher than the previous estimations. Moreover, we have take into account new processus ignore.up to now. These new ingredients have increased to a significant degree the flux at low energy where the flux of antideuteron from exotic sources is maximum. The quantity of antideuteron product by the galaxy is sufficient to be detectable by further experiment as AMS. It is not the case for more higher antinuclei. In this way, if an antihelium will discovery, it will most probably not of secondary origin.
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https://tel.archives-ouvertes.fr/tel-00006637
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Submitted on : Wednesday, August 4, 2004 - 2:35:44 PM
Last modification on : Thursday, November 19, 2020 - 12:58:48 PM
Long-term archiving on: : Wednesday, September 12, 2012 - 5:15:38 PM

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  • HAL Id : tel-00006637, version 1

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Citation

Rémy Duperray. Production et propagation de noyaux légers d'antimatière dans la galaxie. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université Joseph-Fourier - Grenoble I, 2004. Français. ⟨tel-00006637⟩

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