Abstract
The Cryogenic Underground Observatory for Rare Events (CUORE) is the first bolometric experiment searching for neutrinoless double beta (0νββ) decay that has been able to reach the 1-ton scale. The detector consists of an array of 988 TeO2 crystals arranged in a cylindrical compact structure of 19 towers. The construction of the experiment and, in particular, the installation of all towers in the cryostat was completed in 2016 and data taking started in 2017. In this conference we present the 0νββ decay results of CUORE from examining a total TeO2 exposure of 86.3 kg yr, characterized by an effective energy resolution of 7.7 keV FWHM and a background in the region of interest of 0.014 counts/(keV kg yr). Based on these data, CUORE places a lower limit on the 0νββ decay half-life of (90% C.L.). We then discuss the latest updates in the analysis of background and in the evaluation of the half-life of 2νββ decay of 130Te.
Highlights
Double beta decay is a rare process in which a nucleus ( A, Z ) decays to ( A, Z + 2) + 2e− + 2ν .This process is allowed by the Standard Particle models, it is very rare
Given the low event rate in Cryogenic Underground Observatory for Rare Events (CUORE), accidental M2 events are rare (
Different results depending on different channel grouping allow us to probe the uncertainty caused by our present ignorance of the exact location of contaminations
Summary
Double beta decay is a rare process in which a nucleus ( A, Z ) decays to ( A, Z + 2) + 2e− + 2ν. The neutrino could have either a Dirac or a Majorana mass type In the latter case, it would imply violation of the lepton quantum number and new physics beyond the Standard Model. It is worth noting that, if neutrinos are Majorana particles, neutrinoless double beta decay (0νββ) can take place It is a so far unobserved nuclear process in which a nucleus ( A, Z ) decays to ( A, Z + 2) + 2e− , manifestly violating lepton number conservation. CUORE is the first tonne-scale experiment for the search of neutrinoless double beta decay with cryogenic techniques. The ultimate CUORE sensitivity to the half life of 130 Te neutrinoless double beta decay after five years of livetime is 9 × 1025 yr
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