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

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To provide an accurately calibrated polarization analyzer, the analyzing power for elastic scattering of protons from natural carbon at El,b =50.24 MeV and O"b=50. 0' was measured by scattering protons of very high and precisely known polarization (0.9965+0.0007) from a graphite target. The result of the calibration is A =0.9277+0. 0036, where the error is the quadratic sum of the statistical error +0.0033 and systematic uncertainties which total +0.0016. PACS number(s): 25.40.Cm, 24.70.+ s

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