Abstract
Searching for neutrinoless double beta decay is a top priority in particle and astroparticle physics, being the most sensitive test of lepton number violation and the only suitable process to probe the Majorana nature of neutrinos. In order to increase the experimental sensitivity for this particular search, ton-scale detectors operated at nearly zero-background conditions with a low keV energy resolution at the expected signal peak are required. In this scenario, cryogenic detectors have been proven effective in addressing many of these issues simultaneously. After long technical developments, the Cryogenic Underground Observatory for Rare Events (CUORE) experiment established the possibility to operate large-scale detectors based on this technology. Parallel studies pointed out that scintillating cryogenic detectors represent a suitable upgrade for the CUORE design, directed towards higher sensitivities. In this work, we review the recent development of cryogenic detectors, starting from the state-of-the-art and outlying the path toward next-generation experiments.
Highlights
Particle detectors exploit several mechanism to convert an energy deposition from ionizing radiation into a measurable quantity
We review the recent development of cryogenic detectors, starting from the state-of-the-art and outlying the path toward next-generation experiments
20 crystals with different dimensions and mass of about 340 g [28]. These steps paved the way to the MiBETA experiment [29], which solidified the previous results and promoted the possibility to operate a large array of cryogenic detectors
Summary
Particle detectors exploit several mechanism to convert an energy deposition from ionizing radiation into a measurable quantity. The main downsides of these technique are the inability to natively measure different de-excitations, for example heat and scintillation light, and the need for high-power cooling devices to maintain the cryogenic temperatures The former features translate into an inability to identify interacting particles producing undesired backgrounds, while the latter strongly limits the possibility to operate large detector masses with an scalable architecture. Since α and β particles present different scintillation mechanism, the access to a scintillation light readout allows an efficient background tagging Such design has been carefully investigated and put to test in recent years, leading to the definition of a new path towards a next-generation cryogenic detector for the search of neutrinoless double beta decay: CUPID A few alternatives to the CUORE approach will be presented (Section 4.2), to provide a wider picture of the problem
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