Medium effects to N(1535) resonance and eta mesic nuclei
Jun, 2002
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Abstract:
The structure of eta-nucleus bound systems (eta mesic nuclei) is investigated as one of the tools to study in-medium properties of the N(1535) (N^*) resonance by using the chiral doublet model to incorporate the medium effects of the N^* resonance in a chiral symmetric way. We find that the shape and the depth of the eta-nucleus optical potential are strongly affected by the in-medium properties of the N^* and the nucleon. Especially, as a general feature of the potential, the existence of a repulsive core of the eta-nucleus potential at the nuclear center with an attractive part at the nuclear surface is concluded. We calculate the level structure of bound states in this 'central-repulsive and surface-attractive' optical potential and find that the level structure is sensitive to the in-medium properties of the N^*. The (d,3He) spectra are also evaluated for the formation of these bound states to investigate the experimental feasibility. We also make comments on the possible existence of halo-like eta states in beta-unstable halo nuclei.Note:
- 7 pages, 2 figures, REVTeX4
- 14.20.Gk
- 12.39.Fe
- 25.10.+s
- 14.40.Aq
- meson nucleus: bound state
- bound state: (nucleus eta)
- potential: optical
- N(1535): mass
- N(1535): width
- matter: effect
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