Kinematically complete measurement on the reactionH2(n,np)atθn=0°

The differential cross section of the reaction ${}_{}{}^2{}_{}{}^{}\mathrm{H}\mathrm{}(n,np)\mathrm{}$ was measured at ${\theta }_n=0\mathrm{}°$. Because of the applied special geometry the experimental data extend over a large fraction of the phase space, including several final-state interaction regions as well as regions far from the dominance of the quasi-two-body processes. This offers the possibility of extracting neutron-neutron scattering parameters and obtaining simultaneously additional information on the $N-N$ potentials and three-body forces in the frame of an exact three-body calculation.