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An improved limit on the neutrinoless double-electron capture of $^{36}$Ar with GERDA


Agostini, M; Alexander, A; Araujo, G R; Bakalyarov, A M; Balata, M; Barabanov, I; Baudis, L; Bauer, C; Belogurov, S; Bettini, A; Bezrukov, L; Biancacci, V; Bossio, E; Bothe, V; Brudanin, V; Brugnera, R; Caldwell, A; Cattadori, C; Chernogorov, A; Comellato, T; D’Andrea, V; Demidova, E V; Marco, N Di; Doroshkevich, E; Fischer, F; Fomina, M; Ransom, Chloe; Müller, Y; Huang, J; et al (2024). An improved limit on the neutrinoless double-electron capture of $^{36}$Ar with GERDA. European Physical Journal C - Particles and Fields, 84(1):34.

Abstract

The GERmanium Detector Array (Gerda) experiment operated enriched high-purity germanium detectors in a liquid argon cryostat, which contains 0.33% of $^{36}$Ar, a candidate isotope for the two-neutrino double-electron capture (2$\nu $ECEC) and therefore for the neutrinoless double-electron capture (0$\nu $ECEC). If detected, this process would give evidence of lepton number violation and the Majorana nature of neutrinos. In the radiative 0$\nu $ECEC of $^{36}$Ar, a monochromatic photon is emitted with an energy of 429.88 keV, which may be detected by the Gerda germanium detectors. We searched for the $^{36}$Ar 0$\nu $ECEC with Gerda data, with a total live time of 4.34 year (3.08 year accumulated during Gerda Phase II and 1.26 year during Gerda Phase I). No signal was found and a 90% CL lower limit on the half-life of this process was established $T_{1/2} >1.5\cdot 10^{22} $ year.

Abstract

The GERmanium Detector Array (Gerda) experiment operated enriched high-purity germanium detectors in a liquid argon cryostat, which contains 0.33% of $^{36}$Ar, a candidate isotope for the two-neutrino double-electron capture (2$\nu $ECEC) and therefore for the neutrinoless double-electron capture (0$\nu $ECEC). If detected, this process would give evidence of lepton number violation and the Majorana nature of neutrinos. In the radiative 0$\nu $ECEC of $^{36}$Ar, a monochromatic photon is emitted with an energy of 429.88 keV, which may be detected by the Gerda germanium detectors. We searched for the $^{36}$Ar 0$\nu $ECEC with Gerda data, with a total live time of 4.34 year (3.08 year accumulated during Gerda Phase II and 1.26 year during Gerda Phase I). No signal was found and a 90% CL lower limit on the half-life of this process was established $T_{1/2} >1.5\cdot 10^{22} $ year.

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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 > Engineering (miscellaneous)
Physical Sciences > Physics and Astronomy (miscellaneous)
Uncontrolled Keywords:Physics and Astronomy (miscellaneous), Engineering (miscellaneous)
Language:English
Date:14 January 2024
Deposited On:17 Feb 2024 18:04
Last Modified:30 Jun 2024 03:31
Publisher:Springer
ISSN:1434-6044
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1140/epjc/s10052-023-12280-6
PubMed ID:38229675
Project Information:
  • : FunderSchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
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  • : FunderRussian Foundation for Basic Research
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  • : FunderMax-Planck-Gesellschaft
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  • : FunderInstituto Nazionale di Fisica Nucleare
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  • : FunderDeutsche Forschungsgemeinschaft
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  • : FunderBundesministerium für Bildung und Forschung
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  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)