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

Abstract

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 laboratory system and could therefore be bound with high probability, if nuclear $\eta$ states exist. The decay of such a state through the $N^{\ast }(1535)$ resonance would lead to a proton-${\pi }^{-}$ pair emitted in opposite directions. For these conditions we find some indication of such a bound state. An upper limit of $\approx$ 0.5 nb is found.

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References in corpus (2)

• Observation of New States Decaying into ${\Lambda }_c^{+}{K}^{-}{\pi }^{+}$ and ${\Lambda }_c^{+}{K}_S^0{\pi }^{-}$
• A large acceptance scintillator detector with wavelength shifting fibre read-out for search of eta-nucleus bound states

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