Spin observables in np elastic scattering in the energy range 200-600 MeV. Complete experiment

摘要

A survey of available experimental data on the measurement of spin observables in neutron-proton (np) elastic scattering in the neutron energy range 200-600 MeV is presented. Sixteen spin observables (the polarization of recoil particles P-0n00, the analyzing power A(00n0), the spin correlation parameters A(00nn) , A(00ss) , A(00sk) , and A(00kk) , the spin transfer parameters K-0nn0, K-0ss0, and K-0sk0, the depolarization parameters D-0n0n , D-0s0s , and D-0s0k , and the three-spin parameters N-0nkk , N-0skn , N-0ssn , and N-0sns for energies of 200-590 MeV and scattering angles in the center of mass system of 60 degrees-164 degrees) were studied in experiments using polarized neutron beams and polarized proton targets at the Paul Scherrer Institute. The results of these investigations present a complete set of precision data on np elastic scattering which, along with the complete set of data for proton-proton (pp) elastic scattering obtained earlier, provides a basis for unambiguous determination of the amplitudes of the scattering matrix for nucleon-nucleon (NN) elastic scattering for the channel with the isotopic spin I = 0 and makes it possible to describe NN interaction in a model-independent way.