We present results on the search for two-neutrino double-lectron capture (2νECEC) of 124 Xe and neutrinoless double-β decay (0νββ) of 136 Xe in XENON1T. We consider captures from the K shell up to the N shell in 2νECEC = (1.1 ± 0.2stat ± 0.1sys ) × 1022 yr with a the 2νECEC signal model and measure a total half-life of T1/2 0.87 kg yr isotope exposure. The statistical significance of the signal is 7.0σ . We use XENON1T data with 36.16 kg yr of 136 Xe exposure to search for 0νββ. We find no evidence of a signal and set a lower limit on 0νββ > 1.2 × 1024 yr at 90% CL. This is the best result from a dark matter detector without the half-life of T1/2 an enriched target to date. We also report projections on the sensitivity of XENONnT to 0νββ. Assuming a 0νββ > 2.1 × 1025 yr at 90% CL, corresponding to an 275 kg yr 136 Xe exposure, the expected sensitivity is T1/22 effective Majorana mass range of mββ < (0.19–0.59) eV/c .
Double-weak decays of and in the XENON1T and XENONnT experiments
R. Di Stefano;F. Marignetti;
2022-01-01
Abstract
We present results on the search for two-neutrino double-lectron capture (2νECEC) of 124 Xe and neutrinoless double-β decay (0νββ) of 136 Xe in XENON1T. We consider captures from the K shell up to the N shell in 2νECEC = (1.1 ± 0.2stat ± 0.1sys ) × 1022 yr with a the 2νECEC signal model and measure a total half-life of T1/2 0.87 kg yr isotope exposure. The statistical significance of the signal is 7.0σ . We use XENON1T data with 36.16 kg yr of 136 Xe exposure to search for 0νββ. We find no evidence of a signal and set a lower limit on 0νββ > 1.2 × 1024 yr at 90% CL. This is the best result from a dark matter detector without the half-life of T1/2 an enriched target to date. We also report projections on the sensitivity of XENONnT to 0νββ. Assuming a 0νββ > 2.1 × 1025 yr at 90% CL, corresponding to an 275 kg yr 136 Xe exposure, the expected sensitivity is T1/22 effective Majorana mass range of mββ < (0.19–0.59) eV/c .File | Dimensione | Formato | |
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Double-weak decays of 124 Xe and 136Xe in the Xenon1T and Xenonnt experiments.pdf
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