Abstract
The beta decay of ${\mathrm{F}}^{17}$ and ${\mathrm{C}}^{11}$ has been investigated with a magnetic lens spectrometer. The positron spectrum of ${\mathrm{F}}^{17}$ consists of one component of maximum energy 1.748\ifmmode\pm\else\textpm\fi{}0.006 Mev. The ground-state transition, comparative half-life $ft=2420$ sec, has the allowed shape down to 570 kev. Beta-ray branching to the first excited state of ${\mathrm{O}}^{17}$ at 874 kev, if present, has a relative intensity of less than one percent, corresponding to a comparative half-life $\mathrm{ft}\ensuremath{\gtrsim}2\ifmmode\times\else\texttimes\fi{}{10}^{4}$ sec. The positron spectrum of ${\mathrm{C}}^{11}$ consists of one component of maximum energy 968\ifmmode\pm\else\textpm\fi{}8 kev. The ground-state transition, comparative half-life $ft=4170$ seconds, has the allowed shape down to 255 kev.
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