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Détection de neutrinos auprès du réacteur BR2 : analyse des premières données de l'expérience SoLid

Abstract : SoLid (Search for Oscillations with a Lithium-6 detector) is a very short baseline (<10 m) "reactor anti-neutrino" experiment which takes data at the BR2 nuclear reactor (SCK-CEN, Belgium).The first goal is to probe the "reactor" anomaly and to test the hypothesis of the existence of "light" sterile neutrino(s) (Delta m2 ~ 1eV2).Secondarily, the measurement of the neutrino energy spectrum induced by the fission of $^{235}$U will provide new constraints.The 1.6 ton detector, segmented into 12800 detection cells of 5x5x5 cm3, is based on a new technology using two scintillators (PVT and ZnS) read by MPPCs.After contextualizing the experiment and describing the detector, this manuscript describes the procedure to characterize the detector during its construction.Than, data reconstruction and events identification will be presented.The following part describes the calibration procedures, focusing on the evaluation of neutron detection efficiency.Finally, a first analysis will validate the understanding of backgrounds and will extract the anti-neutrino signal.
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Valentin Pestel. Détection de neutrinos auprès du réacteur BR2 : analyse des premières données de l'expérience SoLid. Physique [physics]. Normandie Université, 2019. Français. ⟨NNT : 2019NORMC238⟩. ⟨tel-02469046⟩

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