A search for double-electron capture in 74Se using coincidence/anticoincidence gamma-ray spectrometry

Abstract

Evaluation of single, coincidence and anticoincidence gamma-ray spectrometry methods has been carried out with the aim to search for double-electron capture in 74Se. This process is unique, because there is probability for transition to the 2+ excited state in 74Ge (1204 keV), and de-excitation through two gamma-quanta cascade with energies of 595.9 keV and 608.4 keV. Long-term measurements with anticosmic shielded HPGe spectrometer and the coincidence HPGe-NaI(Tl) spectrometer did not show any evidence for the double-electron capture in 74Se. The best limit for the half-life of the double electron capture in 74Se (both for the neutrinoless and two neutrino processes) was estimated to be >1.5x10E19 years.

11 pages, 3 tables, 5 figures

References in corpus (5)

• Limit on Neutrinoless ββ Decay of Xe-136 from the First Phase of KamLAND-Zen and Comparison with the Positive Claim in Ge-76
• The GERDA experiment for the search of 0νββ decay in ^{76}Ge
• Probing New Physics Models of Neutrinoless Double Beta Decay with SuperNEMO
• Search for ${\beta }^{+}$EC and ECEC processes in ${}^{74}$Se
• Measurement of the background in the NEMO 3 double beta decay experiment

Cited by in corpus (6)

• Neutrinoless Double-Electron Capture
• Improved search for two-neutrino double electron capture on ${}^{124}$Xe and ${}^{126}$Xe using particle identification in XMASS-I
• Limit on the Radiative Neutrinoless Double Electron Capture of ${}^{36}$Ar from GERDA Phase I
• Improved limits on ${\beta }^{+}$EC and ECEC processes in ${}^{74}$Se
• Double electron capture searches in ${}^{74}$Se
• Double Beta Decay Experiments at Canfranc Underground Laboratory