The half-life of the ${}^{20}\mathrm{F}$ ground state was measured using a radioactive beam implanted in a plastic scintillator and recording $\beta \gamma$ coincidences together with four CsI(Na) detectors. The result, $T_{1/2}=11.0011{\left(69\right)}_{\mathrm{stat}}{\left(30\right)}_{\mathrm{sys}}$ s, is at variance by 17 combined standard deviations with the two most precise results. The present value revives the poor consistency of results for this half-life and calls for a new measurement, with a technique having different sources of systematic effects, to clarify the discrepancy.

• Received 23 November 2017

DOI:https://doi.org/10.1103/PhysRevC.97.054328