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 Ga⁷² 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 Ga⁷². A nearly complete decay scheme for Ga⁷² is suggested.The beta-ray spectrum of Ga⁷⁰ (20.5 min.) has also been observed with the spectrometer. The Kurie plot is linear from the end point of 1.65 Mev to 0.4 Mev. No evidence of conversion lines in this energy interval was found.