Uncertainties in np cross sections from 25--225 MeV

The np differential cross sections below Tlab=350 MeV have been heavily measured for over 30 years so that, at present, over 1600 points exist in the np elastic scattering database. Although these data have typical statistical uncertainties of a ''few'' percent, the systematic uncertainties are often quite large and renormalization is essential to resolve conflicts between data sets. We attempt to place limits on the overall uncertainties by comparing, through contour plots, the percentage variations obtained by a number of solutions and models purporting to ''fit'' this very extensive database