Low-lying continuum states of drip-line oxygen isotopes

Low-lying continuum states of exotic oxygen isotopes with $A=23$ –26 are studied, by introducing the continuum-coupled shell model (CCSM) characterized by an infinite wall placed very far away and by an interaction for continuum coupling constructed in a close relation to the realistic shell-model H...

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Bibliographic Details
Published in:Progress of theoretical and experimental physics 2015-09, Vol.2015 (9), p.93
Main Authors: Tsukiyama, Koshiroh, Otsuka, Takaharu, Fujimoto, Rintaro
Format: Article
Language:English
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Summary:Low-lying continuum states of exotic oxygen isotopes with $A=23$ –26 are studied, by introducing the continuum-coupled shell model (CCSM) characterized by an infinite wall placed very far away and by an interaction for continuum coupling constructed in a close relation to the realistic shell-model Hamiltonian. Neutron-emission spectra from exotic oxygen isotopes are calculated by the doorway-state approach in heavy-ion multi-nucleon transfer reactions. The results agree with experiment remarkably well, providing evidence that the continuum effects are stronger than $\sim $ 1 MeV, consistent with the shell evolution in exotic nuclei. The peaks in the neutron spectra are understood as doorway-state resonances. The results by this CCSM doorway-state approach are compared with calculations on neutron-scattering resonance peaks made within the CCSM phase-shift approach and also with those obtained in the Gamow shell model, by taking the same Hamiltonian.
ISSN:2050-3911
2050-3911
DOI:10.1093/ptep/ptv125