Light $\eta $-Mesic Nuclei

Abstract

Data on the production of η mesons on light nuclei near threshold are surveyed.The photoproduction of η 3 He and elastic scattering from this nucleus are modelled in a multiple scattering scheme and the positions of the poles both here and in the scattering from neighbouring light nuclei are studied in an optical potential approach.The production of η 7 Li is compared to that of η 3 He within a cluster model.The decay of light η-mesic nuclei through pion or nucleon emission is also considered.