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

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 $-t=0.15\mathrm{} \mathrm{to} 1.0$ Ge${\mathrm{V}}^2$ at 2, 3, 4, and 6 GeV/c. For $-t\lesssim 0.6$ 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 $\frac{P\left(\mathrm{pn}\right)\mathrm{}}{P\left(\mathrm{pp}\right)\mathrm{}}$ at $-t=0.3\mathrm{}$ Ge${\mathrm{V}}^2$ falling from 0.78±0.02 at 2 GeV/c to 0.22±0.03 at 6 GeV/c.