The Beta- and Gamma-Spectra of Gallium Irradiated by Slow Neutrons

The beta- and gamma-ray spectra of gallium irradiated with slow neutrons have been investigated with a thin-magnetic-lens spectrometer. Probable beta-ray end points for ${\mathrm{Ga}}^{72}$ at 3.15 Mev (9.5 percent), 2.52 Mev (8 percent), 1.48 Mev (10.5 percent), 0.955 Mev (32 percent), and 0.64 Mev (40 percent) were found. A conversion line occurring in about 0.5 percent of the disintegrations was observed at 0.68 Mev. Gamma-rays of 2.51 Mev (26.5 percent), 2.21 Mev (33 percent), 1.87 Mev (7.8 percent), 1.59 Mev (4.5 percent), 1.05 Mev (4.5 percent), 0.84 Mev (100 percent), and 0.63 Mev (24 percent) were also found for ${\mathrm{Ga}}^{72}$. A nearly complete decay scheme for ${\mathrm{Ga}}^{72}$ is suggested.