npelastic spin transfer measurements at 788 MeV

We have measured the spin-transfer parameters ${\mathit{K}}_{\mathit{L}\mathit{L}}$, ${\mathit{K}}_{\mathit{S}\mathit{L}}$, ${\mathit{K}}_{\mathit{L}\mathit{S}}$, and ${\mathit{K}}_{\mathit{S}\mathit{S}}$ at 788 MeV from 47° to 177° c.m., and also uncovered a 10–16 % normalization discrepancy which affects all previous np elastic spin data from LAMPF. Results disagree significantly from previous phase-shift predictions. With the inclusion of these new data the NN phase shifts and amplitudes (isospin 0 and 1) become well determined for the first time near 800 MeV.