Abstract
We investigate the properties of η -nucleus interaction by postulating the N * (1535) dominance for η − N system. We evaluate the N * (1535) properties in the nuclear medium using two kinds of chiral models, and find that these two models provide qualitatively different η -nucleus optical potential reflecting the quite distinct properties of N * (1535) in these chiral models. We find also that the difference of these models can be seen in the formation cross sections of the η mesic nuclei with (d, 3 He) and ( γ ,p) reactions, which are expected to be distinguishable in experiments.
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