Search for $\eta$-mesic nuclei in recoil-free transfer reaction

GEM Collaboration, A. Budzanowski

We have studied the reaction $p+{}^{27}Al\to {}^{3}He+p+{\pi }^{-}+X$ at recoil-free kinematics. An $\eta$ meson possibly produced in this reaction would be thus almost at rest in the labora…