Spin-isospin excitations studied by polarized beams

The spin-parity J(pi) of the spin dipole resonances (SDR) in N-12 and B-12 are investigated via the measurements of polarization observables, the transverse polarization transfer coefficient D-NN for the ((p) over right arrow, (n) over right arrow) reaction at 197 and 295 MeV and the tensor analyzing n power A(xx) for the ((d) over right arrow, He-2) reaction at 270 MeV. The polarization observables, D-NN and A(xx) for the peak at 4.5 MeV are consistent with the DWIA prediction with 2(-) but those for the peak at 7.5 MeV contradict the predictions with an expected J(pi) = 1(-). Neither polarization observables could detect any concentration of 0(-) strength. The usefulness of these spin observables in identifying J(pi) is shown.