Abstract
We report the observation of a narrow structure at W ≈ 1665 MeV and with a width of Γ = 25 MeV in the invariant mass spectrum of the η-neutron pairs that are produced in the reaction γd→ηn(p). These results are obtained from a liquid deuterium target, the data sample was collected with the Crystal Barrel and TAPS detectors at the electron accelerator ELSA. This structure is also seen in preliminary analysis of the data samples taken by the Crystal Ball and TAPS detectors at the electron accelerator MAMI with a liquid deuterium target and a liquid helium 3 target ruling out a nuclear effect.
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