Ionization of light atoms and ions during the nuclear $\beta^{-}$-decay
  Ionization of light atoms and ions during the nuclear $\beta^{-}$-decay is considered. To determine the final state probabilities of electron ionization we have developed a procedure based on the natural orbital expansions for the bound state wave functions of all atoms/ions involved in this process. 
Alexei M. Frolov
physics.atom-ph