Nanosecond Stroboscopic Electron Spectroscopy for Observation of Nuclear Excitation by Electron Transition (NEET) in 197Au

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Abstract
Electron transitions to inner atomic shells release their excess energies in the form of X-rays or Auger electrons. In addition to these two usual processes, a third mechanism called nuclear excitation by electron transition (NEET) can participate in the de-excitation process of atomic inner-shell ionization, if the NEET conditions, in which the nuclear and electronic transitions have almost equal transition energies and a common multipolarity, are satisfied. To observe NEET in 197Au, which would emit 63 keV internal conversion electrons with a half-life of 1.9 ns as a consequence of the NEET process, a specially designed stroboscopic electron spectrometer system was developed. The system allows us to observe the time spectrum of conversion electrons with a time resolution of subnanoseconds.