Linear-Polarization Measurements of the Gamma-Ray Transitions inF20

Linear-polarization and angular-distribution measurements are reported for the $\gamma$ rays from the decay of the 636-, 823-, 984-, 1057-, 1309-, and 2044-keV levels in ${}_{}{}^{20}{}_{}{}^{}\mathrm{F}$. Using our data, in addition to that of previous workers, the levels at 984 and 1309 keV were found to have negative parity, as opposed to the previous assumption of positive parity. Spins and parities of the other levels are discussed, as well as the mixing ratios of the decay $\gamma$ rays.