SINGLE-PARTICLE AND COLLECTIVE PROPERTIES OF DRIP-LINE NUCLEI

We study the effect of the unique shell structure as well as the very low particle threshold on collective modes in drip-line nuclei, first performing the Hartree-Fock (HF) calculation with Skyrme interactions and, then, using the random phase approximation solved in the coordina te space with the Green's function method, We examine also one-particl e resonant states in the HF potential. The properties of both isoscala r and isovector monopole giant resonance (GR) are found to change dras tically in nuclei around the neutron drip line. The characteristic fea ture of the isovector dipole:modes as well as the isoscalar quadrupole modes in drip-line nuclei is also studied.