The theory of nuclear electron capture is reviewed in the light of current understanding of weak interactions. Experimental methods and results regarding capture probabilities, capture ratios, and EC/Beta(+) ratios are summarized. Radiative electron capture is discussed, including both theory and experiment. Atomic wave function overlap and electron exchange effects are covered, as are atomic transitions that accompany nuclear electron capture. Tables are provided to assist the reader in determining quantities of interest for specific cases.

Orbital electron capture by the nucleus

A simple relation for the Fermi function, correct to one per cent, is deduced using the tabulated values of Rose (1955).

https://iopscience.iop.org/article/10.1088/0305-4616/11/3/014/pdf

A simple relation for the Fermi function

Internal bremsstrahlung spectra of β− particle emitters using the Monte Carlo method

Angular distributions and energy spectra of internal bremsstrahlung emitted during beta decay of 32P, 90Y, 204Tl and 210Bi

Inner bremsstrahlung accompanying the first-forbidden beta decay of 86Rb was measured using the magnetic defection technique with a 4.5*5.1 cm2 NaI(Tl) crystal in the energy range 200-1660 keV. The raw spectrum was unfolded using the step-by-step process of Starfelt and Liden and compared with KUB, LF and FM theories. The measured spectrum is found to show fairly good agreement with LF theory in the energy range 200-1500 keV and it is found to deviate thereafter from all three theories.

Inner bremsstrahlung accompanying β decay of 86Rb

https://deepblue.lib.umich.edu/bitstream/handle/2027.42/32900/0000279.pdf;sequence=1

G.W. Ford

Papers

Detour transitions in internal bremsstrahlung