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Quasi-free photoproduction of eta-mesons of the neutron
I. Jaegle ; T. Mertens ; A.V. Anisovich ; J.C.S. Bacelar ; B. Bantes ; O. Bartholomy ; D. Bayadilov ; R. Beck ; Y.A. Beloglazov ; R. Castelijns ; V. Crede ; H. Dutz ; A. Ehmanns ; D. Elsner ; K. Essig ; R. Ewald ; I. Fabry ; M. Fuchs ; C. Funke ; R. Gothe ; R. Gregor ; A.B. Gridnev ; E. Gutz ; S. Hoeffgen ; P. Hoffmeister ; I. Horn ; J. Junkersfeld ; H. Kalinowsky ; S. Kammer ; V. Kleber ; Frank Klein ; Friedrich Klein ; E. Klempt ; M. Konrad ; M. Kotulla ; B. Krusche ; M. Lang ; J. Langheinrich ; H. Loehner ; I.V. Lopatin ; J. Lotz ; S. Lugert ; D. Menze ; J.G. Messchendorp ; V. Metag ; C. Morales ; M. Nanova ; V.A. Nikonov ; D.V. Novinski ; R. Novotny ; M. Ostrick ; L.M. Pant ; H. van Pee ; M. Pfeiffer ; A.K. Radkov ; A. Roy ; A.V. Sarantsev ; S. Schadmand ; C. Schmidt ; H. Schmieden ; B. Schoch ; S. Shende ; V. Sokhoyan ; A. Suele ; V.V. Sumachev ;
Date:	30 Apr 2008
Abstract:	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.
Source:	arXiv, 0804.4841
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