The Radioactivity ofCu67

The $\beta$ spectrum of ${\mathrm{Cu}}^{67}$ is found to contain three groups with maximum energies and relative intensities of 577 kev, 20 percent; 484 kev, 35 percent; 395 kev, 45 percent. Conversion electrons from 92- and 182-kev transitions were observed. These results and the absence of the 296-kev $\gamma$ ray indicate that the $\beta$ transitions go to the ground and first two excited states of the known ${\mathrm{Zn}}^{67}$ levels.