Abstract
A new phase-shift analysis of NN scattering in the energy range 15--160 MeV is presented. The analysis is based on the carefully reviewed world pp+np data, including recent results for higher-order spin observables in n-p scattering. The latter are essential to determine the mixing parameter ${\mathrm{\ensuremath{\varepsilon}}}_{1}$ which is directly related to the isoscalar tensor force. ${\mathrm{\ensuremath{\varepsilon}}}_{1}$ displays a high trend, in agreement with recent analyses above 140 MeV, and is only reproduced by potential models with a strong tensor force. The prediction of the full Bonn potential is too low by 20% for energies above 40 MeV. All other I=0 phase shifts show agreement with potential models; in particular, the notorious problem with $^{1}$${\mathit{P}}_{1}$ around 50 MeV has disappeared. Around 25 MeV a ten parameter fit based purely on np data agrees with the corresponding fit to the pp data and reveals no indication of anomalous charge independence breaking.
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