Low energy $n-\nuc{3}{H}$ scattering : a novel testground for nuclear   interaction
  The low energy $n-\nuc{3}{H}$ elastic cross sections near the resonance peak are calculated by solving the 4-nucleon problem with realistic NN interactions. Three different methods -- Alt, Grassberger and Shandas (AGS), Hyperspherical Harmonics and Faddeev-Yakubovsky -- have been used and their respective results are compared. We conclude on a failure of the existing NN forces to reproduce the $n-\nuc{3}{H}$ total cross section. 
R. Lazauskas, J. Carbonell (LPSC), A. C. Fonseca, M. Viviani, A.   Kievsky, S. Rosati