It is shown that strongly-bound η-nucleus systems, which we term η-mesic nuclei, can be formed between an η meson and nuclei of mass number A>10. We show that a distinct experimental signature for the formation of the η-mesic nucleus can be observed in (${\pi }^{+}$,p) reactions. The formation cross sections are predicted. Effects of higher order dynamics on the predicted width of the η-mesic nucleus are also estimated.

• Received 14 April 1986

DOI:https://doi.org/10.1103/PhysRevC.34.1845