Abstract
Next-generation experiments searching for neutrinoless double-beta decay must be sensitive to a Majorana neutrino mass as low as 10mathrm {~meV}. CUORE , an array of 988 TeO_2 bolometers being commissioned at Laboratori Nazionali del Gran Sasso, features an expected sensitivity of 50–130mathrm {~meV} at 90 % C.L. The background is expected to be dominated by alpha radioactivity, and can be in principle removed by detecting the small amount of Cherenkov light emitted by the beta signal. The Cryogenic wide-Area Light Detectors with Excellent Resolution project aims at developing a small prototype experiment consisting of TeO_2 bolometers coupled to high-sensitivity light detectors based on kinetic inductance detectors. The R&D is focused on the light detectors in view of the implementation in a next-generation neutrinoless double-beta decay experiment.
Highlights
The sensitivity of CUORE is limited by two factors, the amount of isotope and the background level, which is expected to be dominated by α radioactivity
A new experiment to be run after CUORE is being designed, CUPID [7,8]
The goal of the Cryogenic wide-Area Light Detectors with Excellent Resolution (CALDER) project is to realize such detectors and test their performances on a prototype experiment made of a few TeO2 bolometers
Summary
The sensitivity of CUORE is limited by two factors, the amount of isotope and the background level, which is expected to be dominated by α radioactivity. A promising alternative consists in detecting the small amount of Cherenkov light that is emitted by particles absorbed in the TeO2 crystal. Citing [8]: “The most important issue is the reproducibility of the technology (e.g. uniformity of transition temperature across many channels) at temperatures of order 10 mK and the cost and effort required for construction of a large quantity of highquality detectors. Additional aspects, such as multiplexing of the detector signals to reduce the wiring complexity and the heat load, would be useful: solutions already exist in the astrophysics community.”. The goal of the Cryogenic wide-Area Light Detectors with Excellent Resolution (CALDER) project is to realize such detectors and test their performances on a prototype experiment made of a few TeO2 bolometers
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