Abstract
Continuum effects for pairing correlations and low-frequency vibrational excitations in nuclei close to the neutron drip line are investigated within the framework of quasiparticle random phase approximation (QRPA) based on the coordinate space Hartree–Fock–Bogoliubov (HFB) method. Quasiparticle states with small orbital angular momentum ℓ, that suffer a significant change of the spatial structure by pairing correlations, bring about the spatially extended structure of the pairing density that leads to the enhancement of the pairing energy. The similar mechanism in two-quasiparticle states also causes the strong transition strength of low-frequency vibrational excitations.
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