Measurement of Parity Nonconservation inppScattering at 45 MeV

Abstract

Parity nonconservation in $p\ensuremath{-}p$ scattering has been studied by comparing the cross sections ${\ensuremath{\sigma}}^{+}$, and ${\ensuremath{\sigma}}^{\ensuremath{-}}$ for longitudinally polarized 45-MeV protons of positive and negative helicity. The longitudinal analyzing power is found to be ${A}_{z}=\ensuremath{-}(3.2\ifmmode\pm\else\textpm\fi{}1.1)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$. The quoted uncertainty includes the statistical error, the uncertainties of corrections applied, and estimates of systematic effects.