Formation of mesic nuclei by image reactions Original Research Article

We present a theoretical study on formation rates of η and ω meson–nucleus systems induced by (γ,p) reactions on nuclear targets at ideal recoilless condition. We find that the smaller distortion effect in the (γ,p) reaction enables us to investigate properties of the mesons created deeply inside nucleus more clearly. We also consider excitation of scalar–isoscalar (σ) mode in nucleus in order to investigate spectral enhancement around two-pion threshold caused by partial restoration of chiral symmetry. We conclude that valuable information of meson–nucleus interactions can be extracted from global structure of the missing mass spectra in the (γ,p) reaction.