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)

Abstract

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
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Glazier, Dr Derek and McGeorge, Dr John and Robinson, Mr Jamie and Downie, Dr Evangeline and MacGregor, Professor Douglas and Livingston, Dr Kenneth and Howdle, Mr David and McNicoll, Miss Eilidh and Mancell, Mr Joe and Annand, Dr John 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
• ISSN: 0370-2693
• Published Online: 01 February 2012