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We investigate low-lying octupole response of neutron-rich Ni isotopes beyondthe N=50 shell closure using the Skyrme-Hartree-Fock-Bogoliubov mean-fields andthe continuum quasi-particle random phase approximation. Performing detailednumerical analyses employing the Skyrme parameter set SLy4 and adensity-dependent delta interaction of the mixed type, we show that a neutronmode emerges above the neutron separation energy as a consequence of the weakbinding of neutrons and it exhibits strong influences of the di-neutroncorrelation.

Di-neutron correlation in soft octupole excitations of neutron-rich Ni isotopes beyond N=50