Universal properties and structure of halo nuclei |
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Authors: | David L Canham H -W Hammer |
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Institution: | 1. Helmholtz-Institut für Strahlen- und Kernphysik (Theorie), Universit?t Bonn, 53115, Bonn, Germany 2. Bethe Center for Theoretical Physics, Universit?t Bonn, 53115, Bonn, Germany
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Abstract: | The universal properties and structure of halo nuclei composed of two neutrons (2n) and a core are investigated within an effective quantum mechanics framework. We construct an effective interaction potential
that exploits the separation of scales in halo nuclei and treat the nucleus as an effective three-body system. The uncertainty
from higher orders in the expansion is quantified through theoretical error bands. First, we investigate the possibility to
observe excited Efimov states in 2n halo nuclei. Based on the experimental data, 20C is the only halo nucleus candidate to possibly have an Efimov excited state, with an energy less than 7 keV below the scattering
threshold. Second, we study the structure of 20C and other 2n halo nuclei. In particular, we calculate their matter form factors, radii, and two-neutron opening angles. |
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Keywords: | PACS" target="_blank">PACS 21 45 -v Few-body systems 21 60 Gx Cluster models 21 10 Gv Nucleon distributions and halo features 21 30 Fe Forces in hadronic systems and effective interactions |
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