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2011
Journal Article
Titel
Photoproduction of eta'-mesons off the deuteron
Abstract
Quasi-free photoproduction of eta'-mesons off nucleons bound in the deuteron has been measured with the combined Crystal Barrel - TAPS detector. The experiment was done at a tagged photon beam of the ELSA electron accelerator in Bonn for incident photon energies from the production threshold up to 2.5 GeV. The eta'-mesons have been detected in coincidence with recoil protons and recoil neutrons. The quasi-free proton data are in good agreement with the results for free protons, indicating that nuclear effects have no significant impact. The coincidence with recoil neutrons provides the first data for the gamma-n -> n-eta' reaction. In addition, also first estimates for coherent eta'-production off the deuteron have been obtained. In agreement with model predictions, the total cross-section for this channel is found to be very small, at most at the level of a few nb. The data are compared to model calculations taking into account contributions from nucleon resonances and t-channel exchanges.
Author(s)
Anisovich, A.V.
Helmholtz-Institut für Strahlen- und Kernphysik der Universität Bonn, Germany u. Petersburg Nuclear Physics Institute, Gatchina, Russia
Bayadilov, D.E.
Helmholtz-Institut für Strahlen- und Kernphysik der Universität Bonn, Germany u. Petersburg Nuclear Physics Institute, Gatchina, Russia
Crede, V.
Helmholtz-Institut für Strahlen- und Kernphysik der Universität Bonn, Germany u. Department of Physics, Florida State University, Tallahassee, FL, USA
Kotulla, M.
Department Physik, Universität Basel, Switzerland u. II. Physikalisches Institut, Universität Giessen, Germany
Nikonov, V.A.
Helmholtz-Institut für Strahlen- und Kernphysik der Universität Bonn, Germany u. Petersburg Nuclear Physics Institute, Gatchina, Russia
Novinski, D.V.
Helmholtz-Institut für Strahlen- und Kernphysik der Universität Bonn, Germany u. Petersburg Nuclear Physics Institute, Gatchina, Russia
Pee, H. van
Helmholtz-Institut für Strahlen- und Kernphysik der Universität Bonn, Germany u. II. Physikalisches Institut, Universität Giessen, Germany
Sarantsev, A.V.
Helmholtz-Institut für Strahlen- und Kernphysik der Universität Bonn, Germany u. Petersburg Nuclear Physics Institute, Gatchina, Russia
Thoma, U.
Helmholtz-Institut für Strahlen- und Kernphysik der Universität Bonn, Germany u. II. Physikalisches Institut, Universität Giessen, Germany