Abstract
Decay of xenon atoms with a vacancy in the $K$ shell by the emission of photon pairs which continuously share the transition energy was investigated. The results show the expected dominance of transitions of electrons from the $2s$, $3s$, and $3d$ states, for which the single-x-ray transitions are strongly forbidden. In the energy range of the present measurements the resonance effect due to the intermediate $2p$ (and $3p$) states for transitions of electrons from higher shells has not been observed.
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