Eta photoproduction off the neutron at GRAAL
  The gamma n -> eta n quasi-free cross section reveals a resonant structure at W ~ 1.675 GeV. This structure may be a manifestation of a baryon resonance. A priori its properties, the possibly narrow width and the strong photocoupling to the neutron, look surprising. This structure may also signal the existence of a narrow state. 
V.Kuznetsov, O.Bartalini, V.Bellini, M.Castoldi, A.D'Angelo,   J.-P.Didelez, R.Di Salvo, A.Fantini, D.Franco, G.Gervino, F.G...