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- We used the 8πγ-ray spectrometer at the TRIUMF-ISAC radiocative ion beam facility to obtain high precision branching ratios for 19Ne β+ decay to excited states in 19F. Together with other previous work, our measurements determine the superallowed 1/2+ → 1/2+ β branch to the ground state in 19F to be 99.9878(7)%, which is three times more precise than known previously. The implications of these measurements for testing a variety of weak interaction symmetries are discussed briefly.
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