Asymmetries For Elastic Scattering Of Pi(+) From Polarized He-3 And The Delta-Neutron Spin-Spin Interaction

Asymmetries for pi(+) elastic scattering from polarized He-3 were measured across the Delta(1232) pi-nucleon resonance region at incident energies T-pi = 142, 180, and 256 MeV. Large discrepancies were found between the data and calculations that use the multiple scattering formalism and Faddeev wave functions. Inclusion of a Delta-neutron spin-spin interaction term in the calculations gives a greatly improved representation of the data.