SPIN RESPONSE TO BACKWARD (E,E') SCATTERING FROM HEAVY DEFORMED-NUCLEI

The M1 and E2 responses of spin 1(+) excitations to (e, e') scattering from heavy deformed nuclei are studied in QRPA and DWBA on the exampl e of Gd-158. The transverse response originates mainly from the magnet ization currents. The transverse E2 dominates over the longitudinal C2 response for theta greater than or equal to 165 degrees, The joint re sponse of the whole spin-flip region (6-11 MeV) for theta greater than or equal to 165 degrees is characterized by the M1 over E2 dominance for transferred momentum q(eff) < 0.6 fm(-1) (or incident electron ene rgy E(i) < 40 MeV). Above these values the E2 response provides substa ntial contributions to the summed (e, e') cross section. They are larg er in the lower spin-flip region (6-8 MeV) due to the larger orbital ( convection) contributions at lower excitation energy.