The three-nucleon system near the N-d threshold

The three-nucleon system is studied at energies a few hundred keV above the N-d threshold. Measurements of the tensor analyzing powers T-20 and T-21 for p-d elastic scattering at E-c.m. = 432 keV are presented together with the corresponding theoretical predictions, The calculations are extended to very low energies since they are useful for extracting the p-d scattering lengths from the experimental data, The interaction considered here is the Argonne V18 potential plus the Urbana three-nucleon potential, The calculation of the asymptotic D- to S-state ratio for H-3 and He-3, for which recent experimental results are available, is also presented. (C) 1997 Elsevier Science B.V.