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

Pheron, F. et al. (2012) Coherent photoproduction of η-mesons off 3He – search for η-mesic nuclei. Physics Letters B, 709(1-2), pp. 21-27. (doi:10.1016/j.physletb.2012.01.075)

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Coherent photoproduction of η-mesons off 3He, i.e. the reaction γ3He→η3He, 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 η→γγ and η→3π0→6γ 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 η3He final state interaction, pointing to the existence of a resonant state. The search for further evidence of this state in the excitation function of π0-proton back-to-back emission in the γ3He→π0pX reaction revealed a very complicated structure of the background and could not support previous conclusions.

Item Type:Articles
Glasgow Author(s) Enlighten ID:McGeorge, Dr John and Robinson, Mr Jamie and Downie, Dr Evangeline and Livingston, Dr Kenneth and MacGregor, Professor I and Howdle, Mr David and McNicoll, Miss Eilidh and Annand, Dr John and Mancell, Mr Joe and Glazier, Dr Derek and Rosner, Professor Guenther
Authors: Pheron, F., Ahrens, J., Annand, J.R.M., Arends, H.J., Bantawa, K., Bartolome, P.A., Beck, R., Bekrenev, V., Berghäuser, H., Boillat, B., Braghieri, A., Branford, D., Briscoe, W.J., Brudvik, J., Cherepnya, S., Demissie, B., Dieterle, M., Downie, E.J., Drexler, P., Glazier, D.I., Heid, E., Filʼkov, L.V., Hornidge, D., Howdle, D., Jahn, O., Jaegle, I., Jude, T.C., Kashevarov, V.L., Keshelashvili, I., Kondratiev, R., Korolija, M., Kotulla, M., Kulbardis, A., Kruglov, S.P., Krusche, B., Lisin, V., Livingston, K., MacGregor, I.J.D., Maghrbi, Y., Mancell, J., Manley, D.M., Marinides, Z., Martinez, M., McGeorge, J.C., McNicoll, E., Mekterovic, D., Metag, V., Micanovic, S., Middleton, D.G., Mushkarenkov, A., Nefkens, B.M.K., Nikolaev, A., Novotny, R., Oberle, M., Ostrick, M., Oussena, B., Pedroni, P., Polonski, A., Prakhov, S.N., Robinson, J., Rosner, G., Rostomyan, T., Schumann, S., Sikora, M.H., Sober, D.I., Starostin, A., Supek, I., Thiel, M., Thomas, A., Unverzagt, M., Watts, D.P., Werthmüller, D., Witthauer, L., and Zehr, F.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physics Letters B
Publisher:Elsevier BV
Published Online:01 February 2012

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