Cross-section and analyzing-power measurements for the H-2(n,pn)n reactionat 189 MeV

We measured cross sections and analyzing powers for the H-2(n,n)H-2 and H-2 (n,pn)n reactions at 189 MeV at the Indiana University Cyclotron Facility ( IUCF). These measurements are designed to search for evidence of three-body forces in the nuclear force and have the advantage that the Coulomb force is not involved. The analyzing-power measurements for the H-2(n,n)H-2 react ion are in close agreement with those from the analog H-2(p,p)H-2 reaction at nearby energies and do not agree quantiatively with available three-body , Faddeev calculations, either with or without three-body forces included. The H-2(n,pn)n measurements are still under analysis.