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

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

2008-01-31

arxiv.org/abs/0801.4834v1

Nucl.Phys.A811:158-178,2008

Physics

Nuclear Physics

Nuclear Theory

22 pages, 12 figures

Scientific paper

10.1016/j.nuclphysa.2008.07.012

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.

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