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

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