An approximately Coulomb-corrected, charge-symmetric R-matrix prediction for n${\mathrm{-}}^3$H scattering from analyzing p${\mathrm{-}}^3$He data is described, which deviates at most by 2% from the n${\mathrm{-}}^3$H total cross section. The total cross section, together with a new measurement of the coherent scattering length now allows two possible sets of singlet and triplet scattering lengths ${\mathit{a}}_{\mathit{s}}$ and ${\mathit{a}}_{\mathit{t}}$. Our analysis agrees well with the new value of the coherent scattering length, and determines the set with ${\mathit{a}}_{\mathit{s}}$/${\mathit{a}}_{\mathit{t}}$>1 to be the correct one.

• Received 18 September 1989

DOI:https://doi.org/10.1103/PhysRevC.42.438