Quasi-free photoproduction of eta-mesons off He-3 nuclei

Witthauer, L. and Werthmueller, D. and Keshelashvili, I. and Aguar-Bartolome, P. and Ahrens, J. and Annand, J. R. M. and Arends, H. J. and Bantawa, K. and Beck, R. and Bekrenev, V. and Braghieri, A. and Branford, D. and Briscoe, W. J. and Brudvik, J. and Cherepnya, S. and Demissie, B. and Dieterle, M. and Downie, E. J. and Drexler, P. and Fil`kov, L. V. and Fix, A. and Glazier, D. I. and Hamilton, D. and Heid, E. and Hornidge, D. and Howdle, D. and Huber, G. M. and Jaegle, I. and Jahn, O. and Jude, T. C. and Kaeser, A. and Kashevarov, V. L. and Kondratiev, R. and Korolija, M. and Kruglov, S. P. and Krusche, B. and Kulbardis, A. and Lisin, V. and Livingston, K. and MacGregor, I. J. D. and Maghrbi, Y. and Mancell, J. and Manley, D. M. and Marinides, Z. and Martinez, M. and McGeorge, J. C. and McNicoll, E. and Metag, V. and Middleton, D. G. and Mushkarenkov, A. and Nefkens, B. M. K. and Nikolaev, A. and Novotny, R. and Oberle, M. and Ostrick, M. and Oussena, B. and Pedroni, P. and Pheron, F. and Polonski, A. and Prakhov, S. and Robinson, J. and Rosner, G. and Rost, M. and Rostomyan, T. and Schumann, S. and Sikora, M. H. and Sober, D. and Starostin, A. and Supek, I. and Thiel, M. and Thomas, A. and Unverzagt, M. and Watts, D. P.. (2013) Quasi-free photoproduction of eta-mesons off He-3 nuclei. The European physical journal. A, Hadrons and nuclei, Vol. 49, H. 12. p. 154.

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Official URL: http://edoc.unibas.ch/dok/A6223414

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Quasi-free photoproduction of eta-mesons has been measured off nucleons bound in He-3 nuclei for incident photon energies from the threshold region up to 1.4 GeV. The experiment was performed at the tagged photon facility of the Mainz MAMI accelerator with an almost 4 pi covering electromagnetic calorimeter, combining the TAPS and Crystal Ball detectors. The eta-mesons were detected in coincidence with the recoil nucleons. This allowed a comparison of the production cross section off quasi-free protons and quasi-free neutrons and a full kinematic reconstruction of the final state, eliminating effects from nuclear Fermi motion. In the S-11(1535) resonance peak, the data agree with the neutron/proton cross section ratio extracted from measurements with deuteron targets. More importantly, the prominent structure observed in photoproduction off quasi-free neutrons bound in the deuteron is also clearly observed. Its parameters (width, strength) are consistent with the expectations from the deuteron results. On an absolute scale the cross sections for both quasi-free protons and neutrons are suppressed with respect to the deuteron target pointing to significant nuclear final-state interaction effects.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:27 Mar 2014 13:12
Deposited On:27 Mar 2014 13:12

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