The Nuclear Spectrum ofGe77

The disintegration of ${\mathrm{Ge}}^{77}$ (12 hour) has been studied with the help of a magnetic lens spectrometer, coincidence counters, and scintillation counters. The beta-ray spectrum consists of three groups of whose endpoint energies are 2.196 Mev, 1.379 Mev, and 0.710 Mev. In addition there are 13 gamma-rays appearing in the product nucleus ${\mathrm{As}}^{77}$, some of which are internally converted. By coincidence counting techniques it has been shown that the beta-ray of energy 2.196 Mev does not go to the ground state but to an excited state 0.264 Mev above the ground state. A disintegration scheme is suggested.