Measurements on the $\gamma$-ray spectrum from 11-sec ${}_{}{}^{20}{}_{}{}^{}\mathrm{F}$ resulted in an energy of 3332.51(19) keV for the cascade $\gamma$ ray from the ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ 4.97-MeV state and a $\beta$-branching intensity to this level of 0.90(4) × ${10}^{-4\mathrm{}}$ per decay. The corresponding $log{f}_{0}t$ value is 7.16(2), and the excitation energy of the ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ state is 4966.51(20) keV.

[RADIOACTIVITY ${}_{}{}^{20}{}_{}{}^{}\mathrm{F}$; measured $E_{\gamma }$, $I_{\gamma }$; Ge(Li) detector; deduced $E_x$, $\beta$ branching, and $log{f}_{0}t$ value.]

• Received 24 February 1981

DOI:https://doi.org/10.1103/PhysRevC.24.296