Search for $β^+$EC and ECEC processes in $^{74}$Se

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dc.creatorBarabash, A. S.
dc.creatorHubert, Ph.
dc.creatorNachab, A.
dc.creatorUmatov, V.
dc.date2006-10-16
dc.date2006-10-25
dc.date.accessioned2026-07-07T10:24:42Z
dc.date.available2026-07-07T10:24:42Z
dc.descriptionFor the first time, limits on double-beta processes in $^{74}$Se have been obtained using a 400 cm$^3$ HPGe detector and an external source consisting of natural selenium powder. At a confidence level of 90%, they are $1.9\times 10^{18}$ y for the $β^+$EC$(0ν+ 2ν)$ transition to the ground state, $7.7\times 10^{18}$ y for the ECEC($2ν$) transition to the $2^+_1$ excited state in $^{74}$Ge (595.8 keV), $1.1\times 10^{19}$ y for the ECEC($0ν$) transition to the $2^+_1$ excited state in $^{74}$Ge (595.8 keV) and $5.5\times 10^{18}$ y for the ECEC($2ν$) and ECEC($0ν$) transitions to the $2^+_2$ excited state in $^{74}$Ge (1204.2 keV). The last transition is discussed in association with a possible enhancement of the decay rate, in this case by several orders of magnitude, because the ECEC$(0ν)$ process is nearly degenerate with an excited state in the daughter nuclide. Prospects for investigating such processes in future experiments are discussed.
dc.description13 pages, 2 figures; presented at the 2-nd Symposium on "Neutrino and Dark Matter in Nuclear Physics" (Paris, September 3-9, 2006); v3: minor changes
dc.identifierhttps://arxiv.org/abs/hep-ex/0610046
dc.identifierhttp://arxiv.org/abs/hep-ex/0610046
dc.identifierNucl.Phys.A785:371-380,2007
dc.identifierdoi:10.1016/j.nuclphysa.2007.01.002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/176280
dc.subjectHigh Energy Physics - Experiment
dc.titleSearch for $β^+$EC and ECEC processes in $^{74}$Se
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