Lifetime of the 1.042-MeV State inF18

The lifetime of the 1.042-MeV $T=1\mathrm{}$ state in ${}_{}{}^{18}{}_{}{}^{}\mathrm{F}$ was measured by use of the attenuated-Doppler-shift method. Analysis of the measurements by use of the universal stopping cross section given by Lindhard, Scharff, and Schiott give a mean life $\tau =\left(0.4_{-0.2\mathrm{}}^{}{}_{}{}^{+0.3\mathrm{}}\right)\times {10}^{-14\mathrm{}}$ sec. The experimental lifetime agrees with the value calculated from the corresponding Gamow-Teller $\beta$ transition according to a relation given by Kurath. The accuracy of the universal stopping cross section is discussed.