n−dTotal Cross Section, Three-Nucleon Problem, and the Dineutron

The $n-d$ total cross section was measured at 241 different energies to a precision of 5.7-1.0% and an energy resolution of 2.0-5.1% for $2.25\le E_n\le 15.0$ MeV. The results support the correctness of present three-body calculations, and exhibit no evidence for a Wigner cusp near the predicted threshold for dineutron production. In the absence of such a cusp, an experiment of this type furnishes very little information regarding the existence of the dineutron, or of violations of charge independence.