New Direct Limit on Neutrinoless Double Beta Decay Half-Life of Te128 with CUORE

Le résumé fourni par la source

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 ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) decay. Its main goal is to investigate this decay in $^{130}\mathrm{Te}$, but its ton-scale mass and low background make CUORE sensitive to other rare processes as well. In this Letter, we present our first results on the search for $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay of $^{128}\mathrm{Te}$, 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 $^{128}\mathrm{Te}$ $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay half-life of ${T}_{1/2}>3.6\ifmmode\times\else\texttimes\fi{}{10}^{24}\text{ }\text{ }\mathrm{yr}$ (90% CI). This represents the most stringent limit on the half-life of this isotope, improving by over a factor of 30 the previous direct search results, and exceeding those from geochemical experiments for the first time.

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