Analysis of the ${\mathit{A}}_{\mathit{z}\mathit{z}}$ measurement in np scattering at ${\mathit{T}}_{\mathrm{lab}}$=67.5 MeV

We analyze a recent experiment in which the spin-correlation parameter ${\mathit{A}}_{\mathit{z}\mathit{z}}$ in np scattering at ${\mathit{T}}_{\mathrm{lab}}$=67.5 MeV was measured. The I=0 phase parameters can now be determined much more accurately in a single-energy analysis at 50 MeV. The value found for the ${}_{}{}^3{}_{}{}^{}$${\mathit{S}}_{1\mathrm{-}}^3$${\mathit{D}}_1$ mixing parameter ${\mathrm{\varepsilon }}_1$ is in excellent agreement with modern potential-model predictions.