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Scintillateurs cryogéniques pour la détection d'événements rares, dans les expériences EDELWEISS et EURECA

Abstract : A solution to the dark matter problem in astrophysics could be found by the detection of WIMPs, particles predicted by supersymmetry. Its direct detection requires a large mass of detectors, able to identify WIMPs in the background of natural radioactivity and cosmic rays. This thesis takes place within the framework of the EDELWEISS and the future EURECA experiments. These experiments use a technology based on two channel cryogenic detectors (bolometers), working at a few tens of mK. They are made of crystals in which the energy deposited by particle interactions will produce a temperature increase (phonon signal), and where the ionization of the crystals results in either a charge or photon signal, depending on their nature. In order to broaden the range of targets for scintillating bolometers, we have built a setup to study the scintillation of crystals cooled down to 3 K. It is based on a cryostat with a compact optical geometry allowing enhanced light collection. Thanks to an individual photon counting technique and a statistical treatment of data, it allows us to measure the evolution of the the light yields and the decay time components between room temperature and 3 K. Thus this thesis presents the results obtained at 3 K on two well known room temperature crystals: BGO (Bi4Ge3O12) and BaF2. We also study the luminescence properties of titanium sapphire (Ti:Al2O3), under VUV excitation cooled down to 8 K.
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Submitted on : Friday, February 4, 2011 - 10:04:22 AM
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  • HAL Id : tel-00556620, version 2



Marc-Antoine Verdier. Scintillateurs cryogéniques pour la détection d'événements rares, dans les expériences EDELWEISS et EURECA. Autre [cond-mat.other]. Université Claude Bernard - Lyon I, 2010. Français. ⟨NNT : 2010LYO10173⟩. ⟨tel-00556620v2⟩



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