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Coherent photoproduction of eta-mesons off He-3 - search for eta-mesic nuclei

Pheron, F. and Ahrens, J. and Annand, J. R. M. and Arends, H. J. and Bantawa, K. and Bartolome, P. A. and Beck, R. and Bekrenev, V. and Berghaeuser, H. and Boillat, B. 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 Glazier, D. I. and Heid, E. and Fil`kov, L. V. and Hornidge, D. and Howdle, D. and Jahn, O. and Jaegle, I. and Jude, T. C. and Kashevarov, V. L. and Keshelashvili, I. and Kondratiev, R. and Korolija, M. and Kotulla, M. and Kulbardis, A. and Kruglov, S. P. and Krusche, B. 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 Mekterovic, D. and Metag, V. and Micanovic, S. 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 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. I. and Starostin, A. and Supek, I. and Thiel, M. and Thomas, A. and Unverzagt, M. and Watts, D. P. and Werthmueller, D. and Witthauer, L. and Zehr, F.. (2012) Coherent photoproduction of eta-mesons off He-3 - search for eta-mesic nuclei. Physics letters. B, Vol. 709, H. 1-2. pp. 21-27.

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Official URL: http://edoc.unibas.ch/dok/A6070663

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Abstract

Coherent photoproduction of eta-mesons off He-3, i.e. the reaction gamma He-3 -< eta He-3, has been investigated in the near-threshold region. The experiment was performed at the Glasgow tagged photon facility of the Mainz MAMI accelerator with the combined Crystal Ball - TAPS detector. Angular distributions and the total cross section were measured using the eta -< gamma gamma and eta -< 3 pi(0) -< 6 gamma decay channels. The observed extremely sharp rise of the cross section at threshold and the behavior of the angular distributions are evidence for a strong eta He-3 final state interaction, pointing to the existence of a resonant state. The search for further evidence of this state in the excitation function of pi(0)-proton back-to-back emission in the gamma He-3 -< pi(0)pX reaction revealed a very complicated structure of the background and could not support previous conclusions. (C) 2012 Elsevier B.V. All rights reserved.
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:North-Holland
ISSN:0370-2693
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:01 Mar 2013 11:13
Deposited On:01 Mar 2013 11:09

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