The Disintegration ofCu61

By the use of very thin and uniform sources that were prepared by thermal evaporation, the positron spectrum of ${\mathrm{Cu}}^{61}$ continues to show an excess of particles in the low energy region. The presence of nuclear gramma-rays and internal conversion electrons indicates that the disintegration of ${\mathrm{Cu}}^{61}$ is complex. Magnetic spectrometer studies of the radiations from ${\mathrm{Cu}}^{61}$ have led to a tentative disintegration scheme.