A unitary transformation of the Paris and Bonn-(? deuteron wavefunctions (taken as representative examples) is found which results in two slightly different versions of the modified deuteron wavefunction which give the static parameters of the deuteron, namely the RMS radius, the quadrupole moment, the fourth and sixth moments of the deuteron matter density, in agreement with experimental evidence. These wavefunetions have the standard behaviour beyond l f m and lead to the correct description of both the deuteron A(qZ) and B(q') structure functions.

A K-matrix analysis of the ID,, 'F, and 'P,-'F2 partial waves based upon the recent phase-shift analysis by the present author is performed. The analysis provides strong evidence for the existence of the resonance pole in each of these partial waves (two pales in the 'F, wave). Location of the poles relative to the N A cut gives a strong indication that the diproton resonances arise as the unitary reflection of the 'bound' state in the 'S, wave, of the virtual state in the 'P2 wave and of the resonance in the ' P, wave of the NA system. Comparison of the phases of the NA-NA partial amplitudes following from our K-matrix analysis with those ablained in recent partial wave analysis of the pp+ N A reaction shows that the results of the latter cannot sene as a refutation of the existence of diproton resonances. The discrepancies between our results and the latest of the Blacksburg group analysis are discussed in some detail.

We discuss the problem of the evaluation of the real parts of forward pp amplitudes directly from the data at small t. The expressions for daldt and for a number of polarisation parameters are derived in the limit of small t by means of an expansion of the non-singular parts of the amplitudes in powers of t. The analysis of the data at small t available in the energy range 330-800 MeV is performed, and the real parts of forward mixed amplitudes are determined. A method suitable for calculation of the Bethe phases at low and medium energies is proposed, and the real parts of forward hadronic amplitudes are calculated. Comparison of these 'measured' real parts with those predicted by the forward dispersion relations reveals a rather satisfactory agreement for the real parts of all three forward hadronic amplitudes.

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