We present results on the search for two-neutrino double-electron capture (2νECEC) of Xe124 and neutrinoless double-β decay (0νββ) of Xe136 in XENON1T. We consider captures from the K shell up to the N shell in the 2νECEC signal model and measure a total half-life of T1/22νECEC=(1.1±0.2stat±0.1sys)×1022yr with a 0.87kgyr isotope exposure. The statistical significance of the signal is 7.0σ. We use XENON1T data with 36.16kgyr of Xe136 exposure to search for 0νββ. We find no evidence of a signal and set a lower limit on the half-life of T1/20νββ>1.2×1024yrat90%CL. This is the best result from a dark matter detector without an enriched target to date. We also report projections on the sensitivity of XENONnT to 0νββ. Assuming a 275kgyr Xe136 exposure, the expected sensitivity is T1/20νββ>2.1×1025yrat90%CL, corresponding to an effective Majorana mass range of (mββ)<(0.19-0.59)eV/c2.

Aprile E., Abe K., Agostini F., Ahmed Maouloud S., Alfonsi M., Althueser L., et al. (2022). Double-weak decays of Xe 124 and Xe 136 in the XENON1T and XENONnT experiments. PHYSICAL REVIEW C, 106(2), 0-0 [10.1103/PhysRevC.106.024328].

Double-weak decays of Xe 124 and Xe 136 in the XENON1T and XENONnT experiments

Mancuso A.;
2022

Abstract

We present results on the search for two-neutrino double-electron capture (2νECEC) of Xe124 and neutrinoless double-β decay (0νββ) of Xe136 in XENON1T. We consider captures from the K shell up to the N shell in the 2νECEC signal model and measure a total half-life of T1/22νECEC=(1.1±0.2stat±0.1sys)×1022yr with a 0.87kgyr isotope exposure. The statistical significance of the signal is 7.0σ. We use XENON1T data with 36.16kgyr of Xe136 exposure to search for 0νββ. We find no evidence of a signal and set a lower limit on the half-life of T1/20νββ>1.2×1024yrat90%CL. This is the best result from a dark matter detector without an enriched target to date. We also report projections on the sensitivity of XENONnT to 0νββ. Assuming a 275kgyr Xe136 exposure, the expected sensitivity is T1/20νββ>2.1×1025yrat90%CL, corresponding to an effective Majorana mass range of (mββ)<(0.19-0.59)eV/c2.
2022
Aprile E., Abe K., Agostini F., Ahmed Maouloud S., Alfonsi M., Althueser L., et al. (2022). Double-weak decays of Xe 124 and Xe 136 in the XENON1T and XENONnT experiments. PHYSICAL REVIEW C, 106(2), 0-0 [10.1103/PhysRevC.106.024328].
Aprile E.; Abe K.; Agostini F.; Ahmed Maouloud S.; Alfonsi M.; Althueser L.; Andrieu B.; Angelino E.; Angevaare J.R.; Antochi V.C.; Anton Martin D.; A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/967719
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