Abstract
IN two recent papers1 MO11er has shown that on the present theory of β-decay for a heavy nucleus emitting positrons of low maximum energy, the ratio Fk/F of the probability of K-electron capture to that of positron emission may be large. On the other hand, experiments by Jacobsen2 for a light nucleus (radio-scandium, W0 = 1·1 – 0·1 MV., Z = 21) show that this ratio is < 1/10. We wish to point out that Jacobsen's result is in agreement with a modified form of the theory3, but that this form makes a definite prediction about the low energy end of β-spectra.
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