Evidence for the virtual beta-gamma transition in 59Ni

Abstract

A novel theory of radiative electron capture in second forbidden non-unique transition, is applied to reanalyze experimental data obtained previously for the decay of 59Ni. The measured gamma spectrum is shown to be distorted at the high-energy end, presenting the first direct evidence for the virtual beta-gamma transition through the excited state in 59Co. The complete theoretical predictions, including both the direct and the virtual decay channels, as well as the interference between them, reproduce very well the experimental spectrum. The virtual nuclear component amounts to about 4% of the total gamma intensity.

5 pages, 3 figures

References in corpus (6)

• Measurement of the ${\beta }^{+}$ and orbital electron-capture decay rates in fully-ionized, hydrogen-like, and helium-like ${}^{140}$Pr ions
• Nuclear excitation by electron capture followed by fast x-ray emission
• Testing Lorentz invariance in orbital electron capture
• On the keV sterile neutrino search in electron capture
• Radiative electron capture in the first forbidden unique decay of 81Kr
• Radiative orbital electron capture by the atomic nucleus

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• ${\beta }^{-}$ decay $Q$-value measurement of ${}^{136}$Cs and its implications to neutrino studies
• Unique forbidden beta decays at zero momentum transfer