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Nature 140, 235-236 (7 August 1937) | doi:10.1038/140235b0;

Capture of Orbital Electrons

F. HOYLE

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The usual procedure of writing the interaction term as where (N,P) (n,e) represent the heavy and light particles respectively, leads to a transition probability4 A I y^pdT 2 (4#M (W0 ± W)- a = 1 ^ ' Uhlenbeck The ± sign depends upon the electron being absorbed from a state of positive or negative energy. For the-ratio FjcjF the evaluation of (44 4) from the known form5 of the wave -functions for a -K-electron, gives for small Z - W)" Uhlenbeck where y = Z/137.