A DIPOLE-QUADRUPOLE INTERACTION TERM IN E1 PHOTON TRANSITIONS BNL-NCS-66800-99/12-REV S. F. Mughabghab and C. L. Dunford Brookhaven National Laboratory Upton, New York 11973	To NNDC

ABSTRACT

Evidence is presented for a dipole-quadrupole interaction term in the primary E1 transitions of average resonance capture data. This evidence is obtained by testing a proposed generalized Landau Fermi liquid model for spherical and deformed nuclei, which includes the effect of the dipole-quadrupole interaction. The present formulation succeeded in unifying the description of the E1 photon strength functions for spherical and deformed nuclei. The Landau-Migdal interaction constants, as well as the effective nucleon mass, are determined as F₀' = 1.49±0.08, F₁ = 0.12±0.21, and m*/m=1.04±0.07. The temperature dependence of the damping width of the giant dipole resonance is investigated within a generalized Fermi liquid model and its predictions are compared with experimental data, as well as microscopic calculations.