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Quasi-free photoproduction of eta-mesons of the neutron

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arxiv 0804.4841 v1 pith:TEWC7DFP submitted 2008-04-30 nucl-ex

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
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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 T. Szczepanek U. Thoma D. Trnka R. Varma D. Walther C. Weinheimer C. Wendel
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keywords eta-mesonsquasi-freebeengammaneutronphotoproductionrecoilabsent
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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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