A summary of experimental data concerning spin observables in neutron-proton elastic scattering in the neutron energy range 200-600 МeV is presented. In the experiments at the Paul Scherrer Institute with a polarized neutron beam and a polarized proton target the values of 16 spin observables: the polarization of recoil particles P_0n00, the analyzing power A_00n0, the spin correlation parameters A_00nn, A_00ss, A_00sk, A_00kk, the polarization transfer observables K_0nn0, K_0ss0, K_0sk0, the depolarization parameters D_0n0n, D_0s0s, D_0s0k, and three-spin observables N_0nkk, N_0skn, N_0ssn, N_0sns in the energy range from 200 to 590 MeV and for the centre of mass scattering angles from 60 to 164° have been obtained. These data represent complete data base of spin observables which, together with complete set of data for elastic pp interaction, obtained earlier, will allow a direct reconstruction of the I = 0 nucleon-nucleon (NN) scattering matrix amplitudes for elastic NN interaction, and thus providing complete information about the nucleon-nucleon interaction in a model independent way.

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