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Search for tri-nucleon decays of Ge76 in GERDA


Abstract

We search for tri-nucleon decays of $$^{76}$$Ge in the dataset from the GERmanium Detector Array (GERDA) experiment. Decays that populate excited levels of the daughter nucleus above the threshold for particle emission lead to disintegration and are not considered. The ppp-, ppn-, and pnn-decays lead to $$^{73}$$Cu, $$^{73}$$Zn, and $$^{73}$$Ga nuclei, respectively. These nuclei are unstable and eventually proceed by the beta decay of $$^{73}$$Ga to $$^{73}$$Ge (stable). We search for the $$^{73}$$Ga decay exploiting the fact that it dominantly populates the 66.7 keV $$^{73m}$$Ga state with half-life of 0.5 s. The nnn-decays of $$^{76}$$Ge that proceed via $$^{73m}$$Ge are also included in our analysis. We find no signal candidate and place a limit on the sum of the decay widths of the inclusive tri-nucleon decays that corresponds to a lower lifetime limit of 1.2$$\times $$10$$^{26}$$ yr  (90% credible interval). This result improves previous limits for tri-nucleon decays by one to three orders of magnitude.

Abstract

We search for tri-nucleon decays of $$^{76}$$Ge in the dataset from the GERmanium Detector Array (GERDA) experiment. Decays that populate excited levels of the daughter nucleus above the threshold for particle emission lead to disintegration and are not considered. The ppp-, ppn-, and pnn-decays lead to $$^{73}$$Cu, $$^{73}$$Zn, and $$^{73}$$Ga nuclei, respectively. These nuclei are unstable and eventually proceed by the beta decay of $$^{73}$$Ga to $$^{73}$$Ge (stable). We search for the $$^{73}$$Ga decay exploiting the fact that it dominantly populates the 66.7 keV $$^{73m}$$Ga state with half-life of 0.5 s. The nnn-decays of $$^{76}$$Ge that proceed via $$^{73m}$$Ge are also included in our analysis. We find no signal candidate and place a limit on the sum of the decay widths of the inclusive tri-nucleon decays that corresponds to a lower lifetime limit of 1.2$$\times $$10$$^{26}$$ yr  (90% credible interval). This result improves previous limits for tri-nucleon decays by one to three orders of magnitude.

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Additional indexing

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:4 September 2023
Deposited On:22 Dec 2023 10:19
Last Modified:29 Jun 2024 01:41
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/s10052-023-11862-8
Official URL:https://link.springer.com/article/10.1140/epjc/s10052-023-11862-8
PubMed ID:37674593
Project Information:
  • : FunderSchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
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  • : FunderDeutsche Forschungsgemeinschaft
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  • : FunderInstituto Nazionale di Fisica Nucleare
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  • : FunderMax-Planck-Gesellschaft
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  • : FunderBundesministerium für Bildung und Forschung
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  • : FunderNarodowe Centrum Nauki
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  • : FunderRussian Foundation for Basic Research
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  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)