Measurement of the Proton-Neutron Elastic-Scattering Polarization from 2 to 6 GeV/<i>c</i>

Left-right asymmetries from a deuterium target in a polarized-proton beam were observed with the Argonne National Laboratory effective-mass spectrometer. Results were obtained for both $\mathrm{pp}$ and $\mathrm{pn}$ elastic scattering from $\ensuremath{-}t=0.15 \mathrm{to} 1.0$ Ge${\mathrm{V}}^{2}$ at 2, 3, 4, and 6 GeV/c. For $\ensuremath{-}t\ensuremath{\lesssim}0.6$ Ge${\mathrm{V}}^{2}$ the $\mathrm{pn}$ polarization was found to have the same sign as for $\mathrm{pp}$, but with faster energy dependence, the ratio $\frac{P(\mathrm{pn})}{P(\mathrm{pp})}$ at $\ensuremath{-}t=0.3$ Ge${\mathrm{V}}^{2}$ falling from 0.78\ifmmode\pm\else\textpm\fi{}0.02 at 2 GeV/c to 0.22\ifmmode\pm\else\textpm\fi{}0.03 at 6 GeV/c.