We report the first experimental observation of nuclear deexcitation via an electronic-bridge mechanism. We have studied the deexcitation of the 30.7-keV (T1/2~13.6 yr) isomeric level of ⁹³Nb with the electronic bridge involving initial-state L electrons and final-state N or higher electrons. The relative probability for the inelastic-electronic-bridge effect deexcitation, as compared to direct γ-ray decay of the isomeric level, is 0.070±{}0.018. This result is within an order of magnitude of our theoretical prediction of 0.19.
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Kekez et al. (1985) studied this question.
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