Polarization inn−pScattering from 11 to 29.6 MeV

Measurements of neutron-proton polarizations at 90° c.m. have been made at 11.0, 16.8, 23.1, and 29.6 MeV. The results are: 0.0130 ± 0.0049, 0.0280 ± 0.0060, 0.0502 ± 0.0040, and 0.0824 ± 0.0066, respectively. The $\mathrm{T}\mathrm{}(d,n)\mathrm{}{}_{}{}^4{}_{}{}^{}\mathrm{He}$ and $\mathrm{D}\mathrm{}(t,n)\mathrm{}{}_{}{}^4{}_{}{}^{}\mathrm{He}$ reactions were used as sources of monoenergetic polarized neutrons. At 23.1 MeV the polarization was also measured at 70° c.m., and at 29.6 MeV additional measurements were made at 60 and 120° c.m. The 90° data are related to the $T=1\mathrm{}$ spin-orbit $P$-wave splitting, ${\Delta }_{\mathrm{LS}}$. Comparisons were made with current phase-shift analyses, with the result that near 23 and 30 MeV these data give values of ${\Delta }_{\mathrm{LS}}$ in accord with the analyses. Near 10 MeV the theoretical situation is less certain and the data place limits on the value of ${\Delta }_{\mathrm{LS}}$.