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Détection directe de Matière Sombre non-baryonique avec l'hélium 3

Abstract : Results from astrophysics and observational cosmology suggest that the matter content in the Universe is dominated by cold dark matter. Supersymmetric extensions of the Standard Model of particle physics provide a well-motivated candidate for this, the lightest neutralino, which is actively searched using colliders but also with dedicated experiments. This thesis is devoted to the direct detection of non-baryonic dark matter with helium 3 both for the MACHe3 prototype detector and for the MIMAC-He3 detector project. Related to the MACHe3 detector, which uses superfluid helium 3 at ultra-low temperatures, a data analysis method has been developed to recover the energy spectra of neutrons, cosmic muons and low energy electrons. The possibility to detect events in the keV energy range in helium 3 has been demonstrated. This thesis also includes the development of a new detector as an evolution of MACHe3. It consists of a matrix of micro-TPC filled with gazeous helium 3. It permits the discrimination between nuclear and electronic recoils.
A Monte Carlo simulation has been performed to estimate the rejection power of MIMAC-He3 concerning physical backgrounds. Background event rates are compared to the neutralino predicted rate calculated in the framework of effective phenomenological supersymmetric models. The interest of a helium 3 based detector for axial direct detection of neutralinos has been proved. The complementarity of MIMAC-He3 with indirect and scalar direct detection has been demonstrated.
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Contributor : Emmanuel Moulin Connect in order to contact the contributor
Submitted on : Wednesday, January 18, 2006 - 7:58:53 PM
Last modification on : Thursday, November 19, 2020 - 12:58:52 PM
Long-term archiving on: : Saturday, April 3, 2010 - 9:32:41 PM


  • HAL Id : tel-00011418, version 1




Emmanuel Moulin. Détection directe de Matière Sombre non-baryonique avec l'hélium 3. Physique des Hautes Energies - Expérience [hep-ex]. Université Joseph-Fourier - Grenoble I, 2005. Français. ⟨tel-00011418⟩



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