Abstract
CUORE is a cryogenic experiment that focuses on the search of neutrinoless double beta decay in 130Te and it is located at the Gran Sasso National Laboratories. Its detector consists of 988 TeO2 crystals operating at a base temperature of ∼10 mK. It is the first ton-scale bolometric experiment ever realized for this purpose. Thanks to its large target mass and ultra-low background, the CUORE detector is also suitable for the search of other rare phenomena. In particular the low energy part of the spectra is interesting for the detection of WIMP-nuclei scattering reactions. One of the most important requirements to perform these studies is represented by the achievement of a stable energy threshold lower than 10 keV. Here, the CUORE capability to accomplish this purpose using a low energy software trigger will be presented and described.
Highlights
The double beta decay is a rare second order weak transition that can occur for a number of heavy even-even nuclei
A preliminary study of the e ciencies of the standard trigger and of the Optimum Trigger (OT) has been performed with part of the data collected by CUORE during 2019[11]; from a comparison of the standard and OT thresholds, we obtain that the usage OT significantly lowers the energy thresholds
CUORE is searching for 0⌫ decay of Te
Summary
The double beta decay is a rare second order weak transition that can occur for a number of heavy even-even nuclei. The most interesting aspect regards the possibility to probe the neutrino Dirac or Majorana nature: the 0⌫ decay can only occur if the neutrino is a Majorana particle [2] The observation of this decay would give informations on the neutrino absolute mass scale and hierarchy. The CUORE experiment CUORE (Cryogenic Underground Experiment for Rare Events) is an experiment searching for 0⌫ decay in Te[4] The choice of this isotope is due to its high natural isotopic abundance ⌘ = 34.167%, and the Qvalue = 2527.515 keV, that falls in a low background region of the gamma spectrum, namely between the Tl peak, which is the cuto↵ of the natural beta gamma radioactivity, and its Compton edge. The bolometers protection from external radioactivity is provided by lead shields installed into the CUORE cryostat; part of this lead has extremely low radioactivity since it belongs to Ancient Roman age[6]
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