Evidence for Narrow N*(1685) Resonance in Quasifree Compton Scattering on the Neutron
Abstract
The first study of quasi-free Compton scattering on the neutron in the energy range of Eγ=0.75 - 1.5 GeV is presented. The data reveals a narrow peak at W 1.685 GeV. This result, being considered in conjunction with the recent evidence for a narrow structure at W 1.68GeV in the η photoproduction on the neutron, suggests the existence of a new nucleon resonance with unusual properties: the mass M 1.685GeV, the narrow width ≤ 30MeV, and the much stronger photoexcitation on the neutron than on the proton.
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