Abstract
The parity nonconserving asymmetry A γ in the decay of polarized 19F ∗(110keV) nuclei has been measured. A value of A γ = − (6.83 ± 2.11) · 10 −5 (total error) was found. Systematic errors are extensively investigated and found to be small. The absolute normalization is given by the 19F ∗ polarization, which is found to be P F = −0.52 ± 0.08 in a separate experiment, using a calibrated Compton polarimeter. The new result A γ ( 19F) is compared to earlier experiments and recent theoretical calculations. From an analysis including 18F and 21Ne results, constraints on the weak meson-nucleon coupling constants ƒ π and h 0 ρ are deduced. Agreement with calculations based on the standard electroweak theory and QCD is found.
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