COUPLING OF THE GIANT-DIPOLE RESONANCE TO LOW-LYING OCTUPOLE MODES - GENERATOR-COORDINATE METHOD STUDY

The effect on the properties of low lying octupole modes of the coupli ng with the giant dipole resonance is studied within the Generator Coo rdinate Method. Results are presented for Sm-152 which is deformed in its ground state and for the superdeformed state of Hg-190. A basis is first generated by Hartree-Fock+BCS calculations with constraints on the octupole and dipole moments. The same Skyrme SkM effective intera ction used in the mean field is then diagonalised by the GCM. For the octupole K = 0 mode, the effect of the coupling is marginal and the di pole properties of low lying states are satisfactorily described by pu re octupole calculations. For the K = 1 mode, the dipole-octupole coup ling slightly reduces the E1 transition strength.