Abstract
The Cryogenic Underground Observatory for Rare Events (CUORE) is the first bolometric experiment searching for neutrinoless double beta decay that has been able to reach the 1-ton scale. The detector consists of an array of 988 TeO 2 crystals arranged in a cylindrical compact structure of 19 towers, each of them made of 52 crystals. The construction of the experiment was completed in August 2016 and the data taking started in spring 2017 after a period of commissioning and tests. In this work we present the neutrinoless double beta decay results of CUORE from examining a total TeO 2 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 ) . In this physics run, CUORE placed a lower limit on the decay half-life of neutrinoless double beta decay of 130 Te > 1.3 · 10 25 yr (90% C.L.). Moreover, an analysis of the background of the experiment is presented as well as the measurement of the 130 Te 2 ν β β decay with a resulting half-life of T 1 / 2 2 ν = [ 7.9 ± 0.1 ( stat . ) ± 0.2 ( syst . ) ] × 10 20 yr which is the most precise measurement of the half-life and compatible with previous results.
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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