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

Abstract

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

References in corpus (5)

• Exotic modes of excitation in atomic nuclei far from stability
• Coexistence of BCS and BEC-like pair structures in halo nuclei
• Generic strong coupling behavior of Cooper pairs in the surface of superfluid nuclei
• Strong dineutron correlation in 8He and 18C
• Pairing collectivity in medium-mass neutron-rich nuclei near drip-line

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• Study of single-particle resonant states with Green's function method
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