Abstract
The beta spectrum from thin sources of was measured in a double thin-lens -ray spectrometer; the momentum spectrum and the Fermi plot are presented. The Fermi plot for a source of approximately 15 μg/ is a straight line down to about 30 kev; the experiment therefore indicates an allowed shape for the beta spectrum of . Existing experimental evidence to the contrary, that is, for a forbidden spectrum, is discussed and compared with the results of the present experiment.
- Received 6 July 1954
DOI:https://doi.org/10.1103/PhysRev.96.1030
©1954 American Physical Society