New direct limit on neutrinoless double beta decay half-life of ${}^{128}$Te with CUORE

Abstract

The Cryogenic Underground Observatory for Rare Events (CUORE) at Laboratori Nazionali del Gran Sasso of INFN in Italy is an experiment searching for neutrinoless double beta (0$\nu \beta \beta$) decay. Its main goal is to investigate this decay in ${}^{130}$Te, but its ton-scale mass and low background make CUORE sensitive to other rare processes as well. In this work, we present our first results on the search for \nbb decay of ${}^{128}$Te, the Te isotope with the second highest natural isotopic abundance. We find no evidence for this decay, and using a Bayesian analysis we set a lower limit on the ${}^{128}$Te \nbb decay half-life of T${}_{1/2}>3.6\times 10^{24}$ yr (90\% CI). This represents the most stringent limit on the half-life of this isotope, improving by over a factor 30 the previous direct search results, and exceeding those from geochemical experiments for the first time.

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Cited by in corpus (4)

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• Searching for Neutrinoless Double-Beta Decay of ${}^{136}$Xe with PandaX-4T
• Electroweak baryogenesis in the three-loop neutrino mass model with dark matter
• Exploring the keV-scale physics potential of CUORE