Searching for neutrinoless double-beta decay with scintillating bolometers

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A90107%2F21%3A00357742" target="_blank" >RIV/68407700:90107/21:00357742 - isvavai.cz</a>

Result on the web

<a href="https://www.theses.fr/2021UPASP073" target="_blank" >https://www.theses.fr/2021UPASP073</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Searching for neutrinoless double-beta decay with scintillating bolometers

Original language description

Neutrinoless double-beta decay (0γββ) is a hypothetical nuclear transition (T1/2>10(2)⁶ yr) which, if observed, will prove the lepton number violation and confirm the Majorana nature of neutrinos.To study this decay, we use scintillating bolometers. They are cryogenic detectors consisting of a scintillating absorber (where the energy release takes place) coupled to an auxiliary detector to read in coincidence the emitted light. The dual readout, heat and light, is used to discriminate the origin of the particle. In this thesis, two crystals have been studied: enriched Li₂¹⁰⁰MoO₄ and ¹¹⁶CdWO₄ operated as scintillating bolometers, where ¹⁰⁰Mo and ¹¹⁶Cd are the candidates for 0γββ. CUPID-Mo comprises an array of 20 cryogenic scintillating bolometers searching for 0γββ of ¹⁰⁰Mo based on enriched Li₂¹⁰⁰MoO₄ crystals operating at 20 mK. We present the data analysis that led to the new world-leading limit on the half-life of 0γββ) of ¹⁰⁰Mo (T1/2>1.5x10(2)⁴ yr at 90% C.L). We also present the first low energy analysis for dark matter searches with the CUPID-Mo detectors.CUPID is a future ton-scale experiment under design. In this thesis, results from different R&D tests to establish the baseline of the detector structure are presented. In addition, two 0.6 kg ¹¹⁶CdWO₄ crystals, enriched to 82% in ¹¹⁶Cd, were tested for the first time underground as cryogenic scintillating bolometers. Promising results were obtained, showing the prospects of the bolometric technology for high-sensitivity searches for 0γββ of ¹¹⁶Cd. Moreover, we present a preliminary analysis of a low-threshold scintillating bolometer based on a natural CdWO₄ crystal to extract the quenching of the axial-vector coupling gA in the beta decay of ¹¹3Cd.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10304 - Nuclear physics

Project

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Continuities

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Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů