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 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 August 2016 and commissioning started in fall 2016. The experiment has completed the pre-operation phase and is currently in data taking. We present here the achievements of CUORE during the commissioning phase and the limit on the 130Te half-life for the neutrinoless double beta decay that has been released after the first 3 weeks of collected data. Physics results from CUORE-0 will also be updated.
Highlights
Neutrinoless double-beta decay (0νββ) is a second order nuclear decay in which two beta decays occur simultaneously in a nucleus, with the emission of two electrons and no neutrinos [(A, Z) → (A, Z + 2) + 2e−]
The Cryogenic Underground Observatory for Rare Events (CUORE) detector is an array of 988 TeO2 bolometers arranged in a compact structure of 19 towers, each one containing 52 TeO2 crystals, disposed on 13 floors
The detector array is cooled down to 10 mK by a multistage cryostat unique of its kind: the first stage at ∼ 4K is obtained by means of 5 two-stage Cryomech PT415 Pulse Tubes (PTs), with nominal cooling power of 1.5 W at 4.2 K and 40 W at 45 K each.The base temperature is provided by a DRS-CF3000 continuous-cycle 3He/4He Dilution Refrigerator (DR), customized by Leiden Cryogenics for CUORE purpouses
Summary
Neutrinoless double-beta decay (0νββ) is a second order nuclear decay in which two beta decays occur simultaneously in a nucleus (even A, even Z), with the emission of two electrons and no neutrinos [(A, Z) → (A, Z + 2) + 2e−] This process was first hypothesized in [1] and has never been observed so far. Its observation would demonstrate that neutrinos are Majorana particles, that is neutrino and anti-neutrino are the same particle (νe = νe), a feature that has never been so long osserved in any of the known matter constituent It would represent the first evidence of lepton number violation, supporting the leptogenesis as the matter-antimatter asymmetry generation mechanism.
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