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Double-weak decays of $^{124}Xe$ and $^{136}Xe$ in the XENON1T and XENONnT experiments


Abstract

We present results on the search for two-neutrino double-electron 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 the $2ν$ECEC signal model and measure a total half-life of $T^{2νECEC}_{1/2}=(1.1±0.2_{stat}±0.1_{sys})×10^{22}$ yr with a $0.87$ 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 the half-life of $T^{0νββ}_{1/2}>1.2×10^{24}$ yr at $90%$ 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 $275$ kg yr $^{136}Xe$ exposure, the expected sensitivity is $T^{0νββ}_{1/2}>2.1×10^{25}$ yr at $90%$ CL, corresponding to an effective Majorana mass range of $⟨mββ⟩<(0.19–0.59)eV/c^{2}$.

Abstract

We present results on the search for two-neutrino double-electron 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 the $2ν$ECEC signal model and measure a total half-life of $T^{2νECEC}_{1/2}=(1.1±0.2_{stat}±0.1_{sys})×10^{22}$ yr with a $0.87$ 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 the half-life of $T^{0νββ}_{1/2}>1.2×10^{24}$ yr at $90%$ 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 $275$ kg yr $^{136}Xe$ exposure, the expected sensitivity is $T^{0νββ}_{1/2}>2.1×10^{25}$ yr at $90%$ CL, corresponding to an effective Majorana mass range of $⟨mββ⟩<(0.19–0.59)eV/c^{2}$.

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Other titles:Double-weak decays of 124Xe and 136Xe in the XENON1T and XENONnT experiments
Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > Nuclear and High Energy Physics
Language:English
Date:26 August 2022
Deposited On:18 Feb 2023 16:04
Last Modified:28 Jun 2024 01:42
Publisher:American Physical Society
ISSN:2469-9985
OA Status:Hybrid
Publisher DOI:https://doi.org/10.1103/physrevc.106.024328
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  • : FunderNational Science Foundation
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  • : FunderSchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
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  • : FunderDeutsche Forschungsgemeinschaft
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  • : FunderHelmholtz-Gemeinschaft
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  • : FunderNederlandse Organisatie voor Wetenschappelijk Onderzoek
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  • : FunderAmerican Committee for the Weizmann Institute of Science
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  • : FunderIsrael Science Foundation
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  • : FunderFundação para a Ciência e a Tecnologia
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  • : FunderConseil Régional des Pays de la Loire
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  • : FunderKnut och Alice Wallenbergs Stiftelse
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  • : FunderKavli Foundation
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  • : FunderJapan Society for the Promotion of Science
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  • : FunderTsinghua University
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  • : FunderTsinghua Initiative Scientific Research Program
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  • : FunderIstituto Nazionale di Fisica Nucleare Sezione di Padova
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  • : FunderGerman Ministry for Education and Research
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  • : FunderMax Planck Gesellschaft
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  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)