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Two-neutron transfer associated with the pair correlation in superfluidneutron-rich nuclei is studied with focus on low-lying $0^+$ states in Snisotopes beyond the N=82 magic number. We describe microscopically thetwo-neutron addition and removal transitions by means of theSkyrme-Hartree-Fock-Bogoliubov mean-field model and the continuum quasiparticlerandom phase approximation formulated in the coordinate space representation.It is found that the pair transfer strength for the transitions between theground states becomes significantly large for the isotopes with $A \ge 140$,reflecting very small neutron separation energy and long tails of the weaklybound $3p$ orbits. In $^{132-140}$Sn, a peculiar feature of the pair transferis seen in transitions to low-lying excited $0^+$ states. They can be regardedas a novel kind of pair vibrational mode which is characterized by ananomalously long tail of the transition density extending to far outside of thenuclear surface, and a large strength comparable to that of the ground-statetransitions. The presence of the weakly bound neutron orbits plays a centralrole for these anomalous behaviors.

Anomalous pairing vibration in neutron-rich Sn isotopes beyond the N=82 magic number