Evidence for a narrow structure at W~1.68 GeV in eta photoproduction on   the neutron
  New results on quasi-free $\eta$ photoproduction on the neutron and proton bound in a deuteron target are presented. The $\gamma n \to \eta n$ quasi-free cross section reveals a bump-like structure which is not seen in the cross section on the proton. This structure may signal the existence of a relatively narrow ($M\sim 1.68$ GeV, $\Gamma \leq 30$ MeV) baryon state. 
V.Kuznetsov, S.Churikova, G.Gervino, F.Ghio, B.Girolami, D.Ivanov,   J.Jang, A.Kim, W.Kim, A.Ni, Yu.Vorobiev, M.Yurov, A.Zab...