XLVI. Investigation of soft radiations by proportional counters

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Abstract
The proportional counter method has been applied to a study of the β-spectrum of carbon 14 for energies in the range from about 5 kev. to-157·5 kev. (the measured upper limit). While the spectrum appears to be simple, it is found to show considerable departures from the Fermi distribution expected for an allowed transition; the distribution shows a pronounced maximum at ∼40 kev. and falls sharply to nearly zero intensity at lower energies. Considerations of half-life and energy limit, together with the shape of the spectrum in the low energy region, give, in view of the known spin change of unity for the transition, better agreement with the Fermi selection rules than with those of Gamow-Teller.

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