Parity nonconservation in pp scattering has been studied by measuring the helicity dependence of the cross section, Az^ia* -

Parity nonconservation has been studied in elastic pa scattering at 46 MeV with longitudinally polarized protons. The longitudinal analyzing power averaged over the range of laboratory scattering angles of roughly 30° to 60° is found to be A z = ( -3.3 ±0.9) x 10~7. This result and measurements in other light nuclear systems are used to determine weak meson-nucleon coupling constants.

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