Eta-nuclear bound states revisited

Abstract

The strong energy dependence of the s-wave eta-N scattering amplitude at and below threshold, as evident in coupled-channels K-matrix fits and chiral models that incorporate the S11 N*(1535) resonance, is included self-consistently in eta-nuclear bound-state calculations. This approach, applied recently in calculations of kaonic atoms and Kbar-nuclear bound states, is found to impose stronger constraints than ever on the onset of eta-nuclear binding, with a minimum value of Re a_{eta N} approximately 0.9 fm required to accommodate an eta-4He bound state. Binding energies and widths of eta-nuclear states are calculated within several underlying eta-N models for nuclei across the periodic table, including eta-25Mg for which some evidence was proposed in a recent COSY experiment.

v3: 13 pages, including 3 figures and 2 tables, matching published PLB version

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• $\bar{K}$ nuclear bound states in a dynamical model
• Measurement of the dp -->3He eta reaction near threshold
• Eta-meson production in the resonance energy region
• Is there an eta-3He quasi--bound state ?
• Search for the eta-mesic 4He with WASA-at-COSY detector
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Cited by in corpus (35)

• Novel Six-Quark Hidden-Color Dibaryon States in QCD
• Determination of the eta'-proton scattering length in free space
• Constraints on ${\Xi }^{-}$ nuclear interactions from capture events in emulsion
• Search for eta-mesic 4He in the dd->3He n pi0 and dd->3He p pi- reactions with the WASA-at-COSY facility
• In-medium Eta-Nucleon interactions and Eta nuclear bound states
• Determination of the ${\mathbf{\eta }}^3\mathrm{He}$ threshold structure from the low energy $\mathbf{pd}\to {\mathbf{\eta }}^3\mathrm{He}$ reaction
• Onset of $\eta$-meson binding in the He isotopes
• Search for Quasi Bound $\eta$ Mesons
• Examination of $N^{\ast }(1535)$ as a probe to observe the partial restoration of chiral symmetry in nuclear matter
• Eta-mesic nuclei: past, present, future
• Few-body calculations of $\eta$-nuclear quasibound states
• Chirally motivated separable potential model for $\eta N$ amplitudes
• Constraining the optical potential in the search for eta-mesic 4He
• Experimental constraints on the $\omega$-nucleus real potential
• Testing in-medium $\pi N$ dynamics on pionic atoms
• Antinucleon-nucleus interaction near threshold from the Paris $\bar{N}N$ potential
• Upper limits for the production of the eta-mesic Helium in the dd ->3Henpi0 and dd -> 3Heppi- reactions
• Interaction of antiprotons with nuclei
• Few-body aspects of the near threshold pseudoscalar meson production
• Negative-parity nucleon excited state in nuclear matter
• MESON2016 -- Concluding Remarks
• Status and Perspectives of the Search for Eta-Mesic Nuclei
• Search for the manifestation of the mesic-nuclei on the dd-->3HeNpi excitation function measured with WASA-at-COSY
• Study of the N N eta' production with COSY-11
• Luminosity determination for the proton-deuteron reaction using pd -> 3He eta channel with WASA-at-COSY detector
• $K^{+}$-nucleus potentials from $K^{+}$-nucleon amplitudes
• Search for the eta-mesic Helium bound state with the WASA-at-COSY facility
• Revisiting ${\eta }^{\prime }(958)$ nuclear states
• Study of the eta meson production with polarized proton beam
• Search for eta-mesic 3He in non-mesonic final states
• Probing the existence of η^3He mesic nucleus with a few-body approach
• $\eta$ bound state: theory and experiment
• Search for the 4He-eta bound state in dd->(4He-eta)_{bound}->3He n pi0 and dd->(4He-eta)_{bound}->3He p pi- reactions with the WASA-at-COSY facility
• Onset of $\eta$ nuclear binding
• Close to threshold eta' meson production in proton-proton collisions at COSY-11