Spatially extended coherence induced by pairing correlation in low-frequency vibrational excitations of neutron drip line nuclei
Role of pairing correlation for emergence of low-frequency vibrational excitations in neutron drip line nuclei is discussed paying special attention to neutrons with small orbital angular momentum l. Self-consistent pairing correlation in the Hartree-Fock-Bogoliubov (HFB) theory causes the change of...
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Main Author | |
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Format | Journal Article |
Language | English |
Published |
21.04.2005
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Subjects | |
Online Access | Get full text |
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Summary: | Role of pairing correlation for emergence of low-frequency vibrational
excitations in neutron drip line nuclei is discussed paying special attention
to neutrons with small orbital angular momentum l. Self-consistent pairing
correlation in the Hartree-Fock-Bogoliubov (HFB) theory causes the change of
the spatial structure of the quasiparticle wave functions; "the pairing
anti-halo effect" in the lower component and "the broadening effect" in the
upper component. The resultant spatial distribution of the two-quasiparticle
states among low-l neutrons, "the broad localization", brings about
qualitatively new aspects, especially the large transition strength of the
low-frequency vibrational excitations in nuclei close to the neutron drip line.
By performing HFB plus quasiparticle random phase approximation (QRPA)
calculation for the first 2+ states in neutron rich Ni isotopes, the unique
role of self-consistent pairing correlation is pointed out. |
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DOI: | 10.48550/arxiv.nucl-th/0504059 |