Pion scattering by6Li

Abstract

Differential cross sections, excitation functions, and vector (and tensor) polarisations have been calculated for pion elastic and inelastic scattering off ⁶Li near the Delta ₃₃-resonance energy. A momentum-space coupled-channel formalism has been used. It contains the usual first-order term and a phenomenological rho ² term, the parameters of which were determined earlier from pi -¹²C experimental data. Cluster and phenomenological shell-model wavefunctions of the Li nuclear states are shown to produce quantitatively different results for the vector polarisation. At the same time the differential cross sections corresponding to the two nuclear models differ at moderate momentum transfers mainly in their absolute values.