Quasi-free photoproduction of eta-mesons off the the deuteron

Jaegle, I. and Krusche, B. and Anisovich, A. V. and Bacelar, J. C. S. and Bantes, B. and Bartholomy, O. and Bayadilov, D. E. and Beck, R. and Beloglazov, Y. A. and Castelijns, R. and Crede, V. and Dieterle, M. and Dutz, H. and Elsner, D. and Ewald, R. and Frommberger, F. and Funke, C. and Gothe, R. and Gregor, R. and Gridnev, A. B. and Gutz, E. and Hillert, W. and Hoeffgen, S. and Hoffmeister, P. and Horn, I. and Junkersfeld, J. and Kalinowsky, H. and Kammer, S. and Keshelashvili, I. and Kleber, V. and Klein, Frank and Klein, Friedrich and Klempt, E. and Konrad, M. and Kotulla, M. and Lang, M. and Lohner, H. and Lopatin, I. V. and Lugert, S. and Maghrbi, Y. and Menze, D. and Mertens, T. and Messchendorp, J. G. and Metag, V. and Nikonov, V. A. and Nanova, M. and Novinski, D. V. and Novotny, R. and Oberle, M. and Ostrick, M. and Pant, L. M. and van Pee, H. and Pfeiffer, M. and Pheron, F. and Roy, A. and Sarantsev, A. V. and Schadmand, S. and Schmidt, C. and Schmieden, H. and Schoch, B. and Shende, S. V. and Sokhoyan, V. and Suele, A. and Sumachev, V. V. and Szczepanek, T. and Thoma, U. and Trnka, D. and Varma, R. and Walther, D. and Wendel, C. and Werthmueller, D. and Witthauer, L.. (2011) Quasi-free photoproduction of eta-mesons off the the deuteron. European Physical Journal A: Hadrons and Nuclei , 47 (8). p. 89.

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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-state four-momenta of the particles. The total cross-section for quasi-free eta-photoproduction off the neutron reveals even without correction for Fermi motion a pronounced bump-like structure around 1 GeV of incident photon energy, which is not observed for the proton. This structure is even narrower in the invariant-mass spectrum of the.-neutron pairs. Position and width of the peak in the invariant-mass spectrum are W approximate to 1665MeV and FWHM Gamma approximate to 25MeV. The data are compared to the results of different models.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:EDP Sciences with Springer and Società Italiana di Fisica
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:30 Jan 2017 08:26
Deposited On:30 Jan 2017 08:25

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