Evidence for Three Nucleon Force Effects in p-d Elastic Scattering
A. Kievsky, M. H. Wood, C. R. Brune, B. M. Fisher, H. J. Karwowski, D. S. Leonard, E. J. Ludwig, S. Rosati, M. Viviani
Abstract
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 chi2 analysis. The chi2 per datum drastically improves when the three-nucleon interaction is included in the Hamiltonian.
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