Some Properties of the States at 1.346, 1.459, and 1.554 MeV inF19

Measurements of the radiative decay of the triplet of levels at 1.346, 1.459, and 1.554 MeV in ${\mathrm{F}}^{19}$ have been made with a Ge(Li) $\gamma$-ray spectrometer. Results of lifetime measurements for these states when averaged with previous work are, respectively, ${\tau }_m=4.9\mathrm{}\pm 0.5$ psec, 0.084±0.020 psec, and $4.4_{-2.0\mathrm{}}^{}{}_{}{}^{+2.4\mathrm{}}$ fsec. Accurate energies of the three states were determined to be 1345.75±0.20, 1459.1±0.5, and 1554.1±0.3 keV. Information on decay modes and mixing ratios has also been obtained for these states. The decay branching of the 1.459-MeV level was found to differ significantly from that reported by previous investigators. The results are compared with various model predictions.