  Important features of low-frequency collective vibrational excitations in
neutron drip line nuclei are studied. We emphasize that pairing anti-halo
effect in the Hartree-Fock-Bogoliubov (HFB) theory play crucial roles to
realize collective motions in loosely bound nuclei. We study the spatial
properties of one particle - one hole (1p-1h) states with/without
selfconsistent pairing correlations by solving simplified HF(B) equations in
coordinate space. Next, by performing Skyrme-HFB plus selfconsistent
quasiparticle random phase approximation (QRPA) we investigate the first 2+
states in neutron rich Ni isotopes. Three types of calculations, HFB plus QRPA,
resonant BCS plus QRPA, and RPA are compared.
