Investigation of Neutron--Deuteron Charge-Exchange Reaction at Small Transfer Momentum

Analysis of the $nd\to p(nn)$ reaction in a GeV-energy region is performed in the framework based on the multiple-scattering theory for the few-nucleon system. The special kinematic condition, when momentum transfer from neutron beam to final proton closes to zero, is considered. The possibility to extract the spin-dependent term of the elementary $np\to pn$ amplitude from $nd$-breakup process is investigated. The energy dependence of the ratio $R=\frac{d{\sigma }_{nd}}{d\mathrm{\Omega }}\mathrm{/}\frac{d{\sigma }_{np}}{d\mathrm{\Omega }}$ is obtained taking account of the final-state interaction of the two outgoing neutrons in ${}^1{S}_0$-state.