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The excitation function and momentum distribution of {eta} mesons have been measured in photoproduction off 93^Nb in the energy range of 1.2-2.9 GeV. The experiment has been performed with the combined Crystal Barrel and MiniTAPS detector system, using tagged photon beams from the ELSA electron accelerator. Information on the sign and magnitude of the real part of the {eta}-Nb potential has been extracted from a comparison of the data with model calculations. An attractive potential of -(41 pm 10(stat) pm 15(syst)) MeV depth at normal nuclear matter density is deduced within model uncertainties. This value is consistent with the potential depth of -(37 pm 10(stat) pm 10(syst)) MeV obtained in an earlier measurement for a light nucleus (carbon). This relatively shallow {eta}-nucleus potential will make the search for {eta}-nucleus bound states more difficult.
The excitation function and momentum distribution of $eta^prime$ mesons have been measured in photon induced reactions on $^{12}{}$C in the energy range of 1250-2600 MeV. The experiment was performed with tagged photon beams from the ELSA electron ac
The photoproduction of $omega$ and $eta^prime$ mesons off carbon and niobium nuclei has been measured as a function of the meson momentum for incident photon energies of 1.2-2.9 GeV at the electron accelerator ELSA. The mesons have been identified vi
Taking advantage of both the low-emittance proton-beam of the Cooler Synchrotron COSY and the high momentum precision of the COSY-11 detector system, the mass distribution of the eta meson was measured with a resolution of 0.33 MeV/c^2 (FWHM), improv
Taking advantage of both the high mass resolution of the COSY-11 detector and the high energy resolution of the low-emittance proton-beam of the Cooler Synchrotron COSY we determine the excitation function for the pp --> pp eta reaction close-to-thre
A new precise determination of the {eta} meson mass is presented. It is based on a measurement of the threshold for the {gamma}p -> p{eta} reaction using the tagger focal-plane microscope detector at the MAMI-B facility in Mainz. The tagger microscop