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Recherche de la nature du neutrino avec le détecteur SuperNEMO : simulations optiques pour l'optimisation du calorimètre et performances attendues pour le 82Se

Abstract : The SuperNEMO demonstrator is a next generation experimental device, looking for neutrinoless double beta decay. Like its predecessor NEMO3, the experimental technique employed is based on a combination of a tracker and a calorimeter to identify the electrons from the double beta decay process while allowing the differentiation and identification of the different background components. The SuperNEMO’s demonstrator is currently being installed at the Modane Underground Laboratory and will begin to register data by the end of 2017. The aim is to reach a sensivity greater than 1026 years on the half-life of the 82Se ββ0ν process in the final version of the detector (100 kg of isotopes for a 5 years’ total exposure).This thesis contribution to the SuperNEMO, consisted in studying the energy and time response of the calorimeter optical modules (association of a plastic scintillator and a photomultiplier). To do so, an optical simulation based on the GEANT4 software was developed, which enabled to reproduce and simulate all the optical phenomena inside a scintillator and a photomultiplier: scintillation, Birks attenuation, Cerenkov emission, propagation and photon collection. The outcome and result of this thesis has been to develop high-precision corrective factors on the energy linked, so that the Monte-Carlo’s SuperNEMO is closest to the real data experimental records. These corrections were applied to the demonstrator simulation in order to study the impact on the ββ0ν sensitivity. These optical simulations have also been extended to the modeling of the temporal shape of the calorimeter signals.
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Arnaud Huber. Recherche de la nature du neutrino avec le détecteur SuperNEMO : simulations optiques pour l'optimisation du calorimètre et performances attendues pour le 82Se. Astrophysique [astro-ph]. Université de Bordeaux, 2017. Français. ⟨NNT : 2017BORD0682⟩. ⟨tel-01628463⟩

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