Photoproduction of eta-mesons off nuclei for E(gamma)
- Mertens, T.
- Jaegle, I.
- Muehlich, P.
- Bacelar, J. C. S.
- Bantes, B.
- Bartholomy, O.
- Bayadilov, D. E.
- Beck, R.
- Beloglazov, Y. A.
- Castelijns, R.
- Crede, V.
- Dutz, H.
- Ehmanns, A.
- Elsner, D.
- Essig, K.
- Ewald, R.
- Fabry, I.
- Fornet-Ponse, K.
- Fuchs, M.
- Funke, C.
- Gothe, R.
- Gregor, R.
- Gridnev, A. B.
- Gutz, E.
- Hoeffgen, S.
- Hoffmeister, P.
- Horn, I.
- Junkersfeld, J.
- Kalinowsky, H.
- Kammer, S.
- Kleber, V.
- Klein, Frank
- Klein, Friedrich
- Klempt, E.
- Konrad, M.
- Kotulla, M.
- Krusche, B.
- Lang, M.
- Langheinrich, J.
- Loehner, H.
- Lopatin, I. V.
- Lotz, J.
- Lugert, S.
- Menze, D.
- Messchendorp, J. G.
- Metag, V.
- Morales, C.
- Mosel, U.
- Nanova, M.
- Novinski, D. V.
- Novotny, R.
- Ostrick, M.
- Pant, L. M.
- van Pee, H.
- Pfeiffer, M.
- Radkov, A. K.
- Roy, A.
- Schadmand, S.
- Schmidt, C.
- Schmieden, H.
- Schoch, B.
- Shende, S. V.
- Sokhoyan, V.
- Suele, A.
- Sumachev, V. V.
- Szczepanek, T.
- Thoma, U.
- Trnka, D.
- Varma, R.
- Walther, D.
- Weinheimer, C.
- Wendel, C.
DOIAbstract
The photoproduction of eta-mesons off (12)C, (40)Ca, (93)Nb, and (nat)Pb nuclei has been measured with a tagged photon beam with energies between 0.6 and 2.2 GeV. The experiment was performed at the Bonn ELSA accelerator with the combined setup of the Crystal Barrel and TAPS calorimeters. It aimed at the in-medium properties of the S(11)(1535) nucleon resonance and the study of the absorption properties of nuclear matter for eta-mesons. Careful consideration was given to contributions from eta pi final states and secondary production mechanisms of eta-mesons, e.g. from inelastic pi N reactions of intermediate pions. The analysis of the mass number scaling shows that the nuclear absorption cross-section sigma(N eta) for eta-mesons is constan...
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