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An improved limit on the neutrinoless double-electron capture of 36Ar with GERDA
Ist Teil von
The European physical journal. C, Particles and fields, 2024-01, Vol.84 (1), p.34
Ort / Verlag
Berlin/Heidelberg: Springer Berlin Heidelberg
Erscheinungsjahr
2024
Quelle
EZB-FREE-00999 freely available EZB journals
Beschreibungen/Notizen
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
ν
ECEC) and therefore for the neutrinoless double-electron capture (0
ν
ECEC). If detected, this process would give evidence of lepton number violation and the Majorana nature of neutrinos. In the radiative 0
ν
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
ν
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
·
10
22
year.