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We used the 8$\pi$ $\gamma$-ray spectrometer at the TRIUMF-ISAC radiocativeion beam facility to obtain high-precision branching ratios for $^{19}$Ne$\beta^+$ decay to excited states in $^{19}$F. Together with other previouswork, our measurements determine the superallowed $1/2^+ \to 1/2^+$ beta branchto the ground state in $^{19}$F to be 99.9878(7)\%, which is three times moreprecise than known previously. The implications of these measurements fortesting a variety of weak interaction symmetries are discussed briefly.

Precise branching ratio measurements in $^{19}$Ne beta decay and fundamental tests of the weak interaction