Beta Spectra of Neodymium-147

Abstract

The beta spectra of ${\mathrm{Nd}}^{147}$ have been studied with a Siegbahn-Slätis magnetic spectrometer. It has been observed that the first-forbidden beta spectrum, feeding the 91-kev level of ${\mathrm{Pm}}^{147}$, is nonunique, nonstatistical in shape. The beta spectrum feeding the 531-kev level is of statistical shape within the experimental limits of error. The intensity of the beta transition proceeding to the ground state of ${\mathrm{Pm}}^{147}$ is ${10}^{-3\mathrm{}}$ per disintegration.