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The missing-mass spectrum obtained in a recoil-free transfer reactionp($^{27}$Al,$^{3}$He)$\pi^{-}$p'X is analyzed. We find that the observed peakstructure arises from the coherent contributions from two reaction processes inthe energy region corresponding to a bound eta ($\eta$) meson. In one of theprocesses the intermediate $\eta$ is captured by the nucleus to form the$\eta$-mesic nucleus $^{25}$Mg$_{\eta}$. In the other process, the $\eta$ doesnot form $\eta$-nucleus bound state. The interference between these twoprocesses has caused the peak of the spectrum to appear at an $\eta$ bindingenergy stronger than the actual one. Our analysis also indicates that the dataare consistent with an attractive N*(1535)-nucleus interaction at energiesbelow the $\eta$N threshold.

Interference and nuclear medium effects on the eta-mesic nuclear spectrum