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Neutrinoless double beta decay with bolometric detectors.

Previtali E.
  Venerdì 15/09   09:00 - 12:00   Aula A203   III - Astrofisica
Bolometric detectors were proposed for rare events searches more than 30 years ago and have now reached very impressive performances. The start, at the beginning of 2017, of the CUORE experiment (Cryogenic Underground Observatory for Rare Events) opens a new opportunity for neutrinoless double beta decay (0$\nu$DBD) searches with a detector that combines very large mass, around 1 ton, high energy resolution, few keV, and very low background, of the order of $10^{-2}$ counts/(keV kg year). Starting with these ingredients CUORE will play a leading role in search of 0$\nu$DBD during the next few years. In parallel to this successful approach, new bolometric techniques are under study in order to further reduce the final radioactive background. The combination of the measurements of thermal heat and light generated inside a bolometer will give us the possibility to discriminate alpha from beta interactions, helping in reducing one of the most dangerous background in bolometric detectors. The CUPID (CUORE Upgrade with Particle ID) collaboration is working to implement these discrimination techniques and aims to reduce the experimental background by at least one order of magnitude. The current status of the actually running bolometric experiments on 0$\nu$DBD experiments will be discussed.