C. Ythier

The decay of 73Ga

Abstract The isotope 73 Ga was produced by fast neutron and deuteron bombardments of natural and enriched germanium; the decay was studied with scintillation and absorption techniques. The half-life is 4.85 ± 0.10 hours; there are two beta branches of 1.19 (94 %) and 0.4 (≈ 6%) MeV. Three gamma rays of 0.295, 0.745 and 1.04 MeV have been found, the first one of which is in coincidence with the higher energy beta group. A decay scheme is proposed (see fig. 1).

On the decay of 74Ga

Synopsis The beta and gamma radiation from the decay of 8 minute 74Ga, produced by fast neutron bombardment of natural germanium and by deuteron bombardment of enriched 76Ge, was studied by means of scintillation techniques. In addition to very strong gamma rays of 0.600 and 2.35 MeV and five relatively strong gamma rays of 0.865, l.02, 1.20, 1.45 and 1.96 MeV, eleven weaker transitions were observed. Two beta ray branches could be resolved with maximum energies of 2.7 and 4.3 MeV. Some speculations are made about a possible level scheme for 74Ge.

Characterization of the 10 hour 196Au isomer

The Au/sup 196/ isomer was found to decay with a hafl life of 10.0 plus or minus 0.5 hours. Scintillation spectrometer and beta ray spectrometer studies show the existence of four transitions. The half life is governed by an M4 isomeric transition of 176 plus or minus 2 kev which is followed by two gamma rays of 149 plus or minus 2 and 186 plus or minus 2 kev in cascade; a transition of 84 plus or minus 2 kev is probably in cascade with the other transitions. (auth)