Spin Dependence in Neutron-Proton Charge Exchange at 790 MeV

The analyzing power $A$ and spin-transfer parameters $K_{\mathrm{NN}}$, $K_{\mathrm{SS}}$, $K_{\mathrm{SL}}$, and $K_{\mathrm{LL}}$ have been measured in the $\mathrm{np}$ charge-exchange ($\mathrm{np}\to \mathrm{pn}$) region at 790 MeV. These data provide new and unique information on the spin dependence of the $\mathrm{np}$ interaction in the charge-exchange region. Models which explain the charge-exchange peak in the $\mathrm{np}$ elastic differential cross section as being due to interference between one-pion exchange and a slowly varying background are in basic agreement with the data.