Quasi-free photoproduction of eta-mesons of the neutron

Details Quasi-free photoproduction of eta-mesons of the neutron Quasi-free photoproduction of eta-mesons of the neutron

2008-04-30

arxiv.org/abs/0804.4841v1

Phys.Rev.Lett.100:252002,2008

Physics

Nuclear Physics

Nuclear Experiment

accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.100.252002

Quasi-free photoproduction of eta-mesons off nucleons bound in the deuteron has been measured with the CBELSA/TAPS detector for incident photon energies up to 2.5 GeV at the Bonn ELSA accelerator. The eta-mesons have been detected in coincidence with recoil protons and recoil neutrons, which allows a detailed comparison of the quasi-free n(gamma,eta)n and p(gamma,eta)p reactions. The excitation function for eta-production off the neutron shows a pronounced bump-like structure at W=1.68 GeV (E_g ~ 1 GeV), which is absent for the proton.

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