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Evidence for the Emission of a Massive Neutrino in Nuclear Beta Decay
We have studied the {beta}-spectrum of {sup 14}C using a germanium detector containing a crystal with {sup 14}C dissolved in it. We find a feature in the {beta}-spectrum 17 keV below the endpoint which can be explained by the hypothesis that there is a heavy neutrino emitted in the {beta}-decay of {sup 14}C with a mass of 17 {plus minus} 2 keV and an emission probability of 1.40 {plus minus} 0.45%. In addition, we have studied the inner bremsstrahlung spectrum of {sup 55}Fe and also find indications of the emission of a {approximately} 17-keV neutrino. These results are consistent with observations of similar anomalies in the {beta}-decays of {sup 3}H and {sup 35}S. 29 refs., 7 figs