Study ofF20Using theO18(t,nγ)Reaction

Some of the low-lying excited states of ${\mathrm{F}}^{20}$ were studied using the ${\mathrm{O}}^{18}(t,n\gamma ){\mathrm{F}}^{20}$ reaction at a bombarding energy of $E_t=2.7\mathrm{}$ MeV. The methods of $n-\gamma$ and $\gamma -\gamma$ angular correlations were used to obtain information concerning the spins of the 823- and 656-keV states and the multipole mixing ratios of the subsequent electromagnetic deexcitations of these states. The mean lifetime of the 823-keV state was measured with the recoil-distance technique to be 79 ± 6 psec. The results of the experiment are discussed in terms of current nuclear models.