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Analyse de données de l'expérience XENON1T : Calibration des reculs électroniques pour des énergies comprises entre quelques keV et 3 MeV

Abstract : In the last century, several astrophysical observations have provided strong evidence of the existence of dark matter in the Universe. This dark matter, non-luminous and weakly interactive with ordinary matter, is responsible for 80% of the Universe’s mass and could be composed of massive particles called WIMPs. XENON1T is a direct dark matter experiment. It consists of a dual-phase time projection chamber filled with liquid xenon and is operating in an ultra-low background environment. XENON1T was designed to detect the elastic WIMP-xenon nucleus scattering. The rare and low energy signals produced by such interaction ask for a well-known response of the detector and for a long period of data taking. Regular calibration, using an internal source of Kr-83m, were thus carried out to monitor the detector stability. Thanks to the ultra-low background environment, XENON1T allows studying other rare processes. Among them, the search for neutrinoless double ß decay, meant to probe the nature of neutrinos, is a possible perspective thanks to the natural presence of the Xe-136, a double ß decay isotope. The signal expected is an electronic recoil at higher energy with respect to dark matter searches. A dedicated analysis was carried out in order to reconstruct high energy events, allowing to reach the best energy resolution obtained in an experiment using liquid xenon in the region of interest for neutrinoless double ß decay.
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Submitted on : Monday, August 31, 2020 - 4:00:12 PM
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  • HAL Id : tel-02926324, version 1

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Chloé Therreau. Analyse de données de l'expérience XENON1T : Calibration des reculs électroniques pour des énergies comprises entre quelques keV et 3 MeV. Physique Nucléaire Expérimentale [nucl-ex]. Ecole nationale supérieure Mines-Télécom Atlantique, 2020. Français. ⟨NNT : 2020IMTA0191⟩. ⟨tel-02926324⟩

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