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Recherche de matière sombre légère avec des CCDs de l'expérience DAMIC à Snolab

Abstract : A large number of astrophysical and cosmogical observations promote the fact that 80\% of the matter in the Universe is made of an unknown dark matter weakly interacting with the ordinary matter, the dark matter. However little is known about it, and its nature remains one of the unknown of modern physics. Nowadays the vast majority of the direct detection dark matter experiments didn’t detect anything. The Dark Matter In CCDs (DAMIC) experiment at SNOLAB is one of them, and uses Charged Coupled Devices, silicon semi-conductors, as detectors. My work within the DAMIC collaboration was mainly focused on the construction of the radioactive background model with the GEANT4 toolkit. To start we will introduce the DAMIC at SNOLAB experiment and present the simulation of the experiment, from the generation of primary particle to the simulation of the detector behavior to the energy deposit of the particles simulated. Then I will show you the origins and characteristics of the different radioactive isotopes present in the experiment, information that we retrieved from papers, screening measurement and analysis. To finish I will present the radioactive background model coming from the fit of the simulations to the data and the sensibility of the DAMIC experiment.
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Submitted on : Thursday, November 12, 2020 - 10:30:09 AM
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  • HAL Id : tel-03000897, version 1

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João Miguel da Rocha. Recherche de matière sombre légère avec des CCDs de l'expérience DAMIC à Snolab. Astrophysique [astro-ph]. Sorbonne Université, 2019. Français. ⟨NNT : 2019SORUS517⟩. ⟨tel-03000897⟩

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