Abstract
CUORE is a 741 kg array of TeO2 bolometers for the search of neutrinoless double beta decay of 130Te. The detector is being constructed at the Laboratori Nazionali del Gran Sasso, Italy, where it will start taking data in 2015. If the target background of 0.01 counts/(keV⋅kg⋅y) will be reached, in five years of data taking CUORE will have a 1σ half life sensitivity of 1026 y. CUORE-0 is a smaller experiment constructed to test and demonstrate the performances expected for CUORE. The detector is a single tower of 52 CUORE-like bolometers that started taking data in spring 2013. The status and perspectives of CUORE will be discussed, and the first CUORE-0 data will be presented.
Highlights
Where Nββ is the number of ββ0ν decaying nuclei under observation, η is the ββ0ν candidate isotopic abundance and is the detection efficiency. This clearly shows that the sensitivity to the ββ0ν signal goes linearly with the isotopic fraction and the detection efficiency, as the square root of mass and measuring time and, much worse – given the relation between half-life and | mββ | – the improvements on the assessment of the neutrino mass have only a fourth root dependence on the experimental parameters
A dedicated class 1000 clean room area was constructed at the first floor of the underground CUORE experimental building and is equipped with a set of specially designed glove boxes, inside which all operations needed to assemble a detector tower are performed under radon-free atmosphere
CUORE-0 is an array of 52 natTeO2 detectors of 750 g each, for a total mass of 39 kg (∼11 kg of 130Te)
Summary
While G0ν can be calculated with reasonable accuracy, the NME value is strongly dependent on the nuclear model used for its evaluation so that discrepancies of about a factor 2-3 among the various theoretical calculations may be found [5,6,7,8,9,10,11,12,13,14] Such uncertainties are reflected on the | mββ | inferred values. Where Nββ is the number of ββ0ν decaying nuclei under observation, η is the ββ0ν candidate isotopic abundance and is the detection efficiency This clearly shows that the sensitivity to the ββ0ν signal goes linearly with the isotopic fraction and the detection efficiency, as the square root of mass and measuring time and, much worse – given the relation between half-life and | mββ | – the improvements on the assessment of the neutrino mass have only a fourth root dependence on the experimental parameters
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