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We briefly review the motivation to search for sterile neutrinos in the keVmass scale, as dark matter candidates, and the prospects to find them in betadecay or electron capture spectra, with a global perspective. We describe thefundamentals of the neutrino flavor-mass eigenstate mismatch that opens thepossibility of detecting sterile neutrinos in such ordinary nuclear processes.Results are shown and discussed for the effect of heavy neutrino emission inelectron capture in Holmium 163 and in two isotopes of Lead, 202 and 205, aswell as in the beta decay of Tritium. We study the de-excitation spectrum inthe considered cases of electron capture and the charged lepton spectrum in thecase of Tritium beta decay. For each of these cases, we define ratios ofintegrated transition rates over different regions of the spectrum under study,and give new results that may guide and facilitate the analysis of possiblefuture measurements, paying particular attention to forbidden transitions inLead isotopes.

Warm dark matter sterile neutrinos in electron capture and beta decay spectra