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

摘要

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 example of Gd-158. The transverse response originates mainly from the magnetization currents. The transverse E2 dominates over the longitudinal C2 response for theta greater than or equal to 165 degrees, The joint response 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 energy E(i) < 40 MeV). Above these values the E2 response provides substantial contributions to the summed (e, e') cross section. They are larger in the lower spin-flip region (6-8 MeV) due to the larger orbital (convection) contributions at lower excitation energy. [References: 40]