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Study and selection of scintillating crystals for the bolometric search for neutrinoless double beta decay

Abstract : Neutrinoless double beta (0ν2β) decay is a process of great interest for neutrino physics: its observation would provide essential information on neutrino nature and its absolute mass scale. This process consists of the simultaneous transformation of two protons into two neutrons with the emission of two electrons and no neutrino, implying the violation of the total lepton number. Such transition is possible only if neutrinos are equal to antineutrinos (Majorana particles). The searches for such a rare decay are becoming a complicated technical challenge, as next generation of 0ν2β experiments aim at sensitivities of the order of half-life at 10^27-10^28 yr. This thesis is focused on LUMINEU and CUPID-Mo projects, developing the scintillating bolometers technique for 0ν2β decay search with 100Mo with Li2MoO4 crystals. Bolometers are cryogenic detectors measuring the deposited particle energy as a change of temperature in the absorber. The use of scintillating crystals allows to perform discrimination of α particles from γ/β ones due to different light output of these two particle types, rejecting the most challenging background. The scintillating bolometers technology is described in details as an option for a future ton-scale cryogenic experiment, named CUPID, which can completely cover the inverted hierarchy region of neutrino masses.
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Submitted on : Friday, December 14, 2018 - 1:57:08 PM
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Anastasiia Zolotarova. Study and selection of scintillating crystals for the bolometric search for neutrinoless double beta decay. Instrumentation and Detectors [physics.ins-det]. Université Paris-Saclay, 2018. English. ⟨NNT : 2018SACLS293⟩. ⟨tel-01955513⟩

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