Quasi-free photoproduction of eta-mesons off the deuteron
- Jaegle, I.
- Krusche, B.
- Anisovich, A. V.
- Bacelar, J. C. S.
- Bantes, B.
- Bartholomy, O.
- Bayadilov, D. E.
- Beck, R.
- Beloglazov, Y. A.
- Castelijns, R.
- Crede, V.
- Dieterle, M.
- Dutz, H.
- Elsner, D.
- Ewald, R.
- Frommberger, F.
- Funke, C.
- Gothe, R.
- Gregor, R.
- Gridnev, A. B.
- Gutz, E.
- Hillert, W.
- Hoeffgen, S.
- Hoffmeister, P.
- Horn, I.
- Junkersfeld, J.
- Kalinowsky, H.
- Kammer, S.
- Keshelashvili, I.
- Kleber, V.
- Klein, Frank
- Klein, Friedrich
- Klempt, E.
- Konrad, M.
- Kotulla, M.
- Lang, M.
- Löhner, H.
- Lopatin, I. V.
- Lugert, S.
- Maghrbi, Y.
- Menze, D.
- Mertens, T.
- Messchendorp, J. G.
- Metag, V.
- Nikonov, V. A.
- Nanova, M.
- Novinski, D. V.
- Novotny, R.
- Oberle, M.
- Ostrick, M.
- Pant, L. M.
- van Pee, H.
- Pfeiffer, M.
- Pheron, F.
- Roy, A.
- Sarantsev, A. V.
- 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.
- Wendel, C.
- Werthmueller, D.
- Witthauer, L.
DOIAbstract
Precise data for quasi-free photoproduction of eta-mesons off the deuteron have been measured at the Bonn ELSA accelerator with the combined Crystal Barrel/TAPS detector for incident photon energies up to 2.5 GeV. The eta-mesons have been detected in coincidence with recoil protons and neutrons. Possible nuclear effects like Fermi motion and re-scattering can be studied via a comparison of the quasi-free reaction off the bound proton to eta-production off the free proton. No significant effects beyond the folding of the free cross-section with the momentum distribution of the bound protons have been found. These Fermi motion effects can be removed by an analysis using the invariant mass of the eta-nucleon pairs reconstructed from the final-...