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.

22 pages, 12 figures

References in corpus (7)

• In-medium nuclear interactions of low-energy hadrons
• η- and η'-mesic nuclei and U_A(1) anomaly at finite density
• Is there an eta-3He quasi--bound state ?
• Pseudoscalar neutral mesons in hot and dense matter
• Antikaons and hyperons in nuclear matter with saturation
• Search for and study of eta-mesic nuclei in pA-collisions at the JINR LHE nuclotron
• Possibility to study eta-mesic nuclei and photoproduction of slow eta-mesons at the GRAAL facility

Cited by in corpus (12)

• Formation of eta-mesic nuclei by (pi,N) reaction and N^*(1535) in medium
• 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
• Effects of chiral symmetry restoration on meson and dilepton production in relativistic heavy-ion collisions
• Coherent photoproduction of the neutral pion and eta meson on the deuteron at incident energies below 1.15 GeV
• Spectral function of the ${\eta }^{\prime }$ meson in nuclear medium based on phenomenological models
• The structure of N(1535) in the aspect of chiral symmetry
• Pseudoscalar mesons in nuclei and partial restoration of chiral symmetry