Level crossing of particle-hole and mesonic modes in eta mesic nuclei
arXiv:0801.4834 · doi:10.1016/j.nuclphysa.2008.07.012
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 (6)
- In-medium nuclear interactions of low-energy hadrons
- 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