Investigation of the anomaly in eta-photoproduction off the neutron

Details Investigation of the anomaly in eta-photoproduction off the neutron Investigation of the anomaly in eta-photoproduction off the neutron

2010-01-21

arxiv.org/abs/1001.3840v1

Chinese Physics C 2009 33 (12): 1345-1348

Physics

Nuclear Physics

Nuclear Experiment

oral contribution to the workshop on physics of the excited nucleon - NSTAR 2009, Beijing, April 2009

Scientific paper

10.1088/1674-1137/33/12/051

Quasi-free photoproduction of eta-mesons off the neutron and off the proton has been studied using a deuterium target and bremsstrahlung photons produced by MAMI-C with incident energies up to 1.5 GeV. The eta-mesons were detected in coincidence with the recoil nucleons thus a fully exclusive measurement was performed. Preliminary results show a bump-like structure in the excitation function for the neutron close to W $\approx$ 1675 MeV which is not seen for the proton. Considering the experimental resolution and using a Breit-Wigner fit the width of this structure was approximated below 50 MeV.

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