Abstract
The (two-neutrino) double beta decay, the electron capture with positron emission and the double electron capture decay rates are estimated for several nuclides by assuming the dominance of the lowest 1+ state of the intermediate isobar. By using single-β decay matrix elements and energy denominators as experimental imputs we get values independently of nuclear physics calculations. The results for double β- decay are in agreement with the recent geochemical values. Other predictions are within the present experimental sensitivity.
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