Measurement of spin observables in neutron-proton elastic scattering Part II: Rescattering parameters

A double scattering experiment, performed at the Paul-Scherrer-Institut (PS I), has measured a large variety of spin observables for free np elastic sc attering from 260 to 535 MeV in the c.m. angle range from 60 degrees to 164 degrees. Results; are presented for the depolarization parameters D-onon, D-os " os and D-os " ok, the polarization transfer parameters K-onno, K-os " so and K-os " ko, and the 3-index parameters N-onkk, N-os " kn, N-os " sn and N-os " ns. The last four parameters have been measured for the first t ime in this energy range. These measurements considerably improve the data base available for neutron-proton scattering and will allow a direct recons truction of the I = 0 scattering matrix, providing complete information abo ut the nucleon-nucleon interaction in a model-independent way.