Interaction of eta-meson with light nuclei

A microscopic treatment of $η$--nucleus scattering is presented. When applying the underlying exact integral equations, the excitation of the target are neglected, and an input $ηN$ amplitude is chosen which reproduces the $S_{11}(1535)$ resonance. It is shown that the $η$--nucleus scattering lengths are quite sensitive to the $ηN$ parameters and the nuclear wave functions. For a special choice of the parameters an $η{^4\!H}e$ quasi--bound state occurs.

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