The Doppler-shift attenuation method has been applied in conjunction with the ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}(p, n\gamma ){}_{}{}^{19}{}_{}{}^{}\mathrm{Ne}$ reaction to measure the mean lifetimes of four levels in ${}_{}{}^{19}{}_{}{}^{}\mathrm{Ne}$. The present result (140 ± 35 fs) for the mean lifetime of the level at 2794 keV is not in agreement with the only previous measurement. The $\frac{9}{2^{+}}\to \frac{5}{2^{+}}$ $E2\mathrm{}$ transition strength deduced from our result is consistent with shell-model calculations.

NUCLEAR REACTIONS ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}(p, n\gamma )$, $E=12\mathrm{}$ MeV; measured $E_{\gamma }$, Doppler shifts; ${}_{}{}^{19}{}_{}{}^{}\mathrm{Ne}$ deduced energy levels, lifetimes, $B\left(\Lambda \right)$.

• Received 12 July 1976

DOI:https://doi.org/10.1103/PhysRevC.15.1174