We report new results from the search for neutrinoless double-beta decay in ${}^{130}\hspace{0.17em}\mathrm{Te}$ with the CUORE detector. This search benefits from a fourfold increase in exposure, lower trigger thresholds, and analysis improvements relative to our previous results. We observe a background of $(1.38\pm 0.07)\times {10}^{-2}\mathrm{counts}/(\mathrm{keV}\mathrm{kg}\mathrm{yr})$) in the $0\nu \beta \beta$ decay region of interest and, with a total exposure of 372.5 kg yr, we attain a median exclusion sensitivity of $1.7\times {10}^{25}\mathrm{yr}$. We find no evidence for $0\nu \beta \beta$ decay and set a 90% credibility interval Bayesian lower limit of $3.2\times {10}^{25}\mathrm{yr}$ on the ${}^{130}\hspace{0.17em}\mathrm{Te}$ half-life for this process. In the hypothesis that $0\nu \beta \beta$ decay is mediated by light Majorana neutrinos, this results in an upper limit on the effective Majorana mass of 75–350 meV, depending on the nuclear matrix elements used.

中文翻译：

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使用CUORE改进了Te130中无中微子双β衰变的限制

我们报告了寻找中微子双β衰变的新结果 ${}^{130}\hspace{0.17em}特$使用CUORE检测器。与我们以前的结果相比，此搜索得益于曝光量增加了四倍，触发阈值降低以及分析改进。我们观察到$（1.38\pm 0.07）\times {10}^{-2}\mathrm{计数}/（\mathrm{keV}\mathrm{公斤}年）$） 在里面 $0\nu \beta \beta$ 感兴趣的衰减区域，并且在372.5 kg yr的总暴露下，我们获得了 $1.7\times {10}^{25}年$。我们找不到任何证据$0\nu \beta \beta$ 衰减并设置90％的可信区间贝叶斯下限 $3.2\times {10}^{25}年$ 在 ${}^{130}\hspace{0.17em}特$此过程的半衰期。在假设中$0\nu \beta \beta$ 衰变由光马约拉纳中微子介导，这导致有效马约拉纳质量上限为75–350 meV，这取决于所使用的核基质元素。