The study of quasifree Compton scattering on the neutron in the energy range of E-gamma = 0.75-1.5 GeV is presented. The data reveal a narrow peak at W similar to 1.685 GeV. This result, being considered in conjunction with the recent evidence for a narrow structure at W similar to 1.68 GeV in eta photoproduction on the neutron, suggests the existence of a nucleon resonance with unusual properties: a mass M similar to 1.685 GeV, a narrow width Gamma <= 30 MeV, and the much stronger photoexcitation on the neutron than on the proton.
Evidence for a narrow N*(1685) resonance in quasifree Compton scattering on the neutron
Bellini V;Mammoliti F;Randieri C;Russo Giuseppe;Sperduto ML;Sutera CM;
2011-01-01
Abstract
The study of quasifree Compton scattering on the neutron in the energy range of E-gamma = 0.75-1.5 GeV is presented. The data reveal a narrow peak at W similar to 1.685 GeV. This result, being considered in conjunction with the recent evidence for a narrow structure at W similar to 1.68 GeV in eta photoproduction on the neutron, suggests the existence of a nucleon resonance with unusual properties: a mass M similar to 1.685 GeV, a narrow width Gamma <= 30 MeV, and the much stronger photoexcitation on the neutron than on the proton.File in questo prodotto:
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