Evidence for a large breaking of charge independence in the NN interaction

In an energy-dependent phase-shift analysis of all np scattering data below T/sub lab/ = 30 MeV, we find a large breaking of charge independence in the ..pi..NN coupling constants g/sub 0//sup 2/ and g/sub c//sup 2/. For 495 degrees of freedom we obtain chi/sub min//sup 2/ = 533.8 and ..delta..g/sup 2/equivalentg/sub c//sup 2/-g/sub 0//sup 2/ = 1.28 +- 0.15. A combined analysis, including also all pp scattering data below T/sub lab/ = 30 MeV, results in chi/sub min//sup 2/ = 847.2 for 840 degrees of freedom. We then obtain ..delta..g/sup 2/ = 1.62 +- 0.27. The effect of such large values for ..delta..g/sup 2/ is most strikingly seen in the /sup 3/P waves. The np /sup 3/P phase shifts at T/sub lab/ = 25 MeV are much larger than those of other phase-shift analyses.