An effective nucleon-nucleon spin-orbit force is included in a single-channel resonating-group calculation for the ${}_{}{}^3{}_{}{}^{}\mathrm{He}$(${}_{}{}^3{}_{}{}^{}\mathrm{H}$)+$\alpha$ system up to a c.m. energy of 113.1 MeV. The parameters of the spin-orbit force were chosen to reproduce the phase shifts for $p+\alpha$ scattering at low energies and the bound-state properties of ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ and ${}_{}{}^7{}_{}{}^{}\mathrm{Be}$. A phenomenological, parity-dependent imaginary potential is used to account for reaction channels. The calculation gives a reasonable account of the experimental differential cross sections and analyzing powers available in this energy region.

NUCLEAR REACTIONS ${}_{}{}^3{}_{}{}^{}\mathrm{He}$(${}_{}{}^3{}_{}{}^{}\mathrm{H}$)+$\alpha$, bound states to 113.1 MeV (c.m.); calculated elastic differential cross sections and analyzing powers; resonating-group method.

• Received 27 July 1981

DOI:https://doi.org/10.1103/PhysRevC.25.23