Bound-state double- β decay

  title={Bound-state double-
  author={A. Babivc and Duvsan vStef'anik and Mikhail I. Krivoruchenko and Fedor vSimkovic},
  journal={Physical Review C},
We consider new modes of two-neutrino and neutrinoless double-$\beta$ decays in which one $\beta$ electron goes over to a continuous spectrum and the other occupies a vacant bound level of the daughter ion. We calculate the corresponding phase-space factors of the final states, estimate the partial decay rates, and derive the one- and two-electron energy spectra using relativistic many-electron wave functions of atoms provided by the multiconfiguration Dirac-Hartree-Fock package GRASP2K. While… 
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