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We present the most accurate and complete data set for the analyzing power Ay(θ) in neutronproton scattering. The experimental data were corrected for the effects of multiple scattering, both in the center detector and in the neutron detectors. The final data at En = 12.0 MeV deviate considerably from the predictions of nucleon-nucleon phase-shift analyses and potential models. The impact of the new data on the value of the charged pion-nucleon coupling constant is discussed in a model study.

The analyzing power A y (θ ) for neutron elastic scattering from 12 C has been measured for 33 neutron energies between E n = 2.2 and 8.5 MeV in the angular range from 25 • to 145 • in the laboratory system. The primary motivation for these measurements is the need for an accurate knowledge of A y (θ) for 12 C(n, n) 12 C elastic scattering to enable corrections to high-precision neutron-proton and neutron-deuteron A y (θ) data in the neutronenergy range below E n = 30 MeV. In their own right, 12 C(n, n) 12 C A y (θ) data are of crucial importance for improving both the parametrization of n-12 C scattering and our knowledge of the level scheme of 13 C. The present A y (θ ) data are compared with published data and previous phase-shift-analysis results.

Abstract. High-accuracy differential cross-section data for neutron-deuteron elastic scattering at centre-of-mass backward angles in the range from 140 ~ to 178 ~ have been measured to accuracies better than _+ 3% for incident neutron energies of 8.0, 10.0, and 14.0 MeV. The measurements were made by detection of the recoil deuterons and protons from a mixed CD2-CH 2 foil. The new data are compared to existing data and to three-nucleon calculations with the Bonn-B nucleon-nucleon potential. We conclude that the present measurements unambiguously resolve the discrepancies among previously reported data of the same type.

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