AI Article Synopsis
- The GERDA experiment used high-purity germanium detectors in a liquid argon cryostat to search for neutrinoless double-electron capture (0ECEC) involving argon, which could indicate new physics like lepton number violation.
- Over 4.34 years of data, including 3.08 years from Gerda Phase II, no signals were detected for this process.
- A 90% confidence level lower limit on the half-life of 0ECEC was established, meaning the process, if it exists, takes longer than the time frame of the experiment.
Article Abstract
Unlabelled: The GERmanium Detector Array (Gerda) experiment operated enriched high-purity germanium detectors in a liquid argon cryostat, which contains 0.33% of Ar, a candidate isotope for the two-neutrino double-electron capture (2ECEC) and therefore for the neutrinoless double-electron capture (0ECEC). If detected, this process would give evidence of lepton number violation and the Majorana nature of neutrinos. In the radiative 0ECEC of 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 Ar 0ECEC 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 year.
Supplementary Information: The online version contains supplementary material available at 10.1140/epjc/s10052-023-12280-6.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10788323 | PMC |
| http://dx.doi.org/10.1140/epjc/s10052-023-12280-6 | DOI Listing |
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