Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2010-03-24
Phys.Rev.C83:022201,2011
Physics
High Energy Physics
High Energy Physics - Experiment
Replaced with the version published in Phys. Rev. C
Scientific paper
10.1103/PhysRevC.83.022201
The first study of quasi-free Compton scattering on the neutron in the energy range of $E_{\gamma}=0.75 - 1.5$ GeV is presented. The data reveals a narrow peak at $W\sim 1.685$ GeV. This result, being considered in conjunction with the recent evidence for a narrow structure at $W\sim 1.68$GeV in the $\eta$ photoproduction on the neutron, suggests the existence of a new nucleon resonance with unusual properties: the mass $M\sim 1.685$GeV, the narrow width $\Gamma \leq 30$MeV, and the much stronger photoexcitation on the neutron than on the proton.
Bellini Valerio
Boiko T.
Chebotarev S.
Dho H. S.
Gervino Gianpiero
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