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Starting from a recent model of the eta'N interaction, we evaluate theeta'-nucleus optical potential, including the contribution of lowest order indensity, t rho/2m_eta', together with the second order terms accounting foreta' absorption by two nucleons. We also calculate the formation cross sectionof the eta' bound states from (pi+,p) reactions on nuclei. The eta'-nucleuspotential suffers from uncertainties tied to the poorly known eta'Ninteraction, which can be partially constrained by the experimental modulus ofthe eta'N scattering length and/or the recently measured transparency ratios ineta' nuclear photoproduction. Assuming an attractive interaction and taking theclaimed experimental value |a_eta'N| = 0.1 fm, we obtain a eta' opticalpotential in nuclear matter at saturation density of V_eta' = -(8.7 + 1.8i)MeV, not attractive enough to produce eta' bound states in light nuclei. Largervalues of the scattering length give rise to deeper optical potentials, withmoderate enough imaginary parts. For a value |a_eta'| = 0.3 fm, which can stillbe considered to lie within the uncertainties of the experimental constraints,the spectra of light and medium nuclei show clear structures associated toeta'-nuclear bound states and to threshold enhancements in the unbound region.

eta-prime nucleus optical potential and possible eta-prime bound states