NEUTRON-H-3 AND PROTON-HE-3 ZERO-ENERGY SCATTERING

The Kohn variational principle and the (con-elated) hyperspherical har monics technique are applied to study the n-H-3 and p-He-3 scattering at zero energy. Predictions for the singlet and triplet scattering len gths art obtained for nonrelativistic nuclear Hamiltonians including t wo- and three-body potentials. The calculated n-H-3 total cross sectio n agrees well viith the measured value, while some small discrepancy i s found for the coherent scattering length. For the p-He-3 channel, Ih s calculated scattering lengths are in reasonable agreement with the v alues extrapolated from the measurements made above 1 MeV.