Beta Decay ofF20

The beta decay of ${\mathrm{F}}^{20}$ has been investigated with a magnetic lens spectrometer. The decay proceeds mainly to the first excited state of ${\mathrm{Ne}}^{20}$ by a beta ray of maximum energy 5.419±0.013 Mev, followed by a gamma ray of energy 1.627±0.005 Mev. The excited state transition, with comparative half-life $ft=9.73\mathrm{}\times {10}^4$ seconds, has the allowed shape down to 1 Mev.