Simultaneous np and pp phase shift analysis at 18.2 and 9.9 mev and the question of additivity of Coulomb and nuclear phase shift

The simultaneous phase-shift analysis of np and pp data is performed at 18.2 and 9.7 MeV. Three and four sets of phase-shifts are obtained, respectively. The previously obtained nuclear potentials for non-mixing states of the two-nucleon system are used to calculate the maximum error in the simultaneous phase-shift analysis, due to the assumption on the additivity of the Coulomb and nuclear phase-shifts. Optimal experiments are planned for a further specification of the experimental quantities.In conclusion the authors thank J. Bystrický, L. I. Lapidus, R. M. Ryndin and P. Winternitz for helpful discussions and E. Dudova, J. Fingerova, A. M. Fokina and L. F. Graczeva for their assistance.