Exclusive measurement of quasi-free η-photoproduction from deuterium

Weiss, J. and Achenbach, P. and Beck, R. and Hejny, V. and Kleber, V. and Kotulla, M. and Krusche, B. and Kuhr, V. and Leukel, R. and Metag, V. and de Leon, V. M. O. and Owens, R. O. and Rambo, F. and Schmidt, A. and Siodlaczek, U. and Stroher, H. and Wissmann, F. and Wolf, M.. (2003) Exclusive measurement of quasi-free η-photoproduction from deuterium. The European physical journal. A, Hadrons and nuclei, Vol. 16, H. 2. pp. 275-284.

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Official URL: http://edoc.unibas.ch/dok/A5261954

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Quasi-free photoproduction of eta-mesons from the deuteron has been measured at the tagged photon facility of the Mainz microtron MAMI with the photon spectrometer TAPS for incident photon energies from the production threshold at 630 MeV up to 820 MeV. In a fully exclusive measurement eta-mesons and recoil nucleons were detected in coincidence. At incident photon energies above the production threshold on the free nucleon, where final-state interaction effects are negligible, an almost constant ratio of sigma(n)/sigma(p) = 0.66 +/- 0.10 was found. At lower incident photon energies the ratio rises due to re-scattering effects. The average ratio agrees with the value extracted from a comparison of the inclusive d(gamma,eta)X cross section to the free-proton cross-section via a participant-spectator model for the deuteron cross-section (sigma(n)/sigma(p) = 0.67 +/- 0.07). The angular dependence of the ratio agrees with the expected small deviation of neutron and proton cross-section from isotropy due to the influence of the D-13(1520)-resonance. The energy dependence of the ratio in the excitation energy range of the S-11(1535)-resonance disfavors model predictions which try to explain this resonance as KSigma bound state.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Note:Variant title: Exclusive measurement of quasi-free eta-photoproduction from deuterium -- Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:26
Deposited On:22 Mar 2012 13:55

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