New IsotopeLu180

Abstract

Irradiation of enriched ${}_{}{}^{180}{}_{}{}^{}\mathrm{Hf}$ with 14.7-MeV neutrons was found to produce a new radioactive nuclide which was assigned to ${}_{}{}^{180}{}_{}{}^{}\mathrm{Lu}$. The following radiation characteristics were observed to belong to the decay of ${}_{}{}^{180}{}_{}{}^{}\mathrm{Lu}$: half-life 5.8±0.2 min; $\gamma$-ray energies 93.3±0.8, 215.3±0.8, 316.8±0.8, 408.4±0.8, 464.4±0.8, 1065.2±1.5, 1106.8±0.8, 1197±1, 1199.5±0.8, 1298.8±0.8, 1315.0±1.0, 1433.6±1.0, 1514.3±0.8, and 1873.9±2.0 keV; and a $\beta$ ray of 1.45±0.10 MeV. A tentative decay scheme is presented and discussed.