Level crossing of particle-hole and mesonic modes in eta mesic nuclei

Abstract

We study eta meson properties in the infinite nuclear matter and in atomic nuclei with an emphasis on effects of the eta coupling to N*(1535)--nucleon-hole modes. The N*(1535) resonance, which dominates the low-energy eta-nucleon scattering, can be seen as a chiral partner of the nucleon. The change of the chiral mass gap between the N* and the nucleon in a nuclear medium has an impact on the properties of the eta-nucleus system. If the N*-nucleon mass gap decreases with a density increase (chiral symmetry restoration) the calculations show the existence of the resonance state at the energy about 60 MeV and two bound eta-nucleus states with the binding energies about -80 MeV. These states can have strong effect on predicted cross sections of the ^12C (gamma,p) ^11B reaction with eta-meson production.

arXiv comment22 pages, 12 figures

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• Eta-nuclear bound states revisited
• Interaction of eta mesons with nuclei
• Formation of eta-mesic nuclei by (pi,N) reaction and N^*(1535) in medium
• Chiral condensate at finite density using chiral Ward identity
• Examination of $N^{\ast }(1535)$ as a probe to observe the partial restoration of chiral symmetry in nuclear matter
• Casimir effect for nucleon parity doublets
• Application of a coupled-channel Complex Scaling Method with Feshbach projection to the $K^{-}pp$ system
• Formation spectra of light kaonic nuclei by in-flight ($\bar{K},N$) reactions with chiral unitary amplitude
• $\eta$-nucleus interaction from the $d+d$ reaction around the $\eta$ production threshold
• Resonance Structure in the $\gamma \gamma$ Invariant Mass Spectrum in $p$C- and $d$C-Interactions
• Resonance-like structure near the $\eta d$ threshold in the $\gamma d${$\to$}${\pi }^0\eta d$ reaction
• Double-pole nature of $\Lambda (1405)$ studied with coupled-channel complex scaling method using complex-range Gaussian basis
• (d,3He) reaction on odd-neutron nuclear target for the formation of deeply bound pionic atoms
• Effects of chiral symmetry restoration on meson and dilepton production in relativistic heavy-ion collisions
• Eta meson rescattering effects in the p + 6Li --> eta + 7Be reaction near threshold
• Spectral function of the ${\eta }^{\prime }$ meson in nuclear medium based on phenomenological models
• Coherent photoproduction of the neutral pion and eta meson on the deuteron at incident energies below 1.15 GeV
• Pairwise final state interactions in the p d --> p d eta reaction near threshold
• Effect of the final state interaction of ${\eta }^{\prime }N$ on the ${\eta }^{\prime }$ photoproduction off nucleon
• The structure of N(1535) in the aspect of chiral symmetry
• Formation of Heavy Meson Bound States by Two Nucleon Pick-up Reactions
• Mesons in Nuclei and Partial Restoration of Chiral Symmetry
• Pseudoscalar mesons in nuclei and partial restoration of chiral symmetry