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Narrow Structure in the Excitation Function of eta Photoproduction off the Neutron

Werthmueller, D. and Witthauer, L. 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. F. 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. N. and Robinson, J. and Rosner, G. 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) Narrow Structure in the Excitation Function of eta Photoproduction off the Neutron. Physical review letters, Vol. 111, H. 23 , 232001.

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Official URL: http://edoc.unibas.ch/dok/A6223415

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Abstract

The photoproduction of eta mesons off nucleons bound in H-2 and He-3 has been measured in coincidence with recoil protons and recoil neutrons for incident photon energies from threshold up to 1.4 GeV. The experiments were performed at the Mainz MAMI accelerator, using the Glasgow tagged photon facility. Decay photons from the eta -< 2 gamma and eta -< 3 pi(0) decays and the recoil nucleons were detected with an almost 4 pi electromagnetic calorimeter combining the Crystal Ball and TAPS detectors. The data from both targets are of excellent statistical quality and show a narrow structure in the excitation function of gamma n -< n eta. The results from the two measurements are consistent, taking into account the expected effects from nuclear Fermi motion. The best estimates for position and intrinsic width of the structure are W = (1670 +/- 5) MeV and Gamma = (30 +/- 15) MeV. For the first time precise results for the angular dependence of this structure have been extracted.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Physical Society
ISSN:0031-9007
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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