Evidence for Three Nucleon Force Effects in p-d Elastic Scattering
  A new measurement of the p-d differential cross section at Ep= 1 MeV has been performed. These new data and older data sets at energies below the deuteron breakup are compared to calculations using the two-nucleon Argonne v18 and the three-nucleon Urbana IX potentials. A quantitative estimate of the capability of these interactions to describe the data is given in terms of a chi^2 analysis. The chi^2 per datum drastically improves when the three-nucleon interaction is included in the Hamiltonian. 
A. Kievsky, M.H. Wood, C.R. Brune, B.M. Fisher, H.J. Karwowski, D.S.   Leonard, E.J. Ludwig, S. Rosati, M. Viviani