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Coherent photoproduction of π0- and η-mesons off 7Li

Maghrbi, Y. ; Krusche, B. ; Ahrens, J. ; Annand, J. ; Arends, H. ; Beck, R. ; Bekrenev, V. ; Boillat, B. ; Braghieri, A. ; Branford, D. ; Briscoe, W. ; Brudvik, J. ; Cherepnya, S. ; Codling, R. ; Downie, E. ; Drexler, P. ; Fil'kov, L. ; Fix, A. ; Glazier, D. ; Gregor, R. ; Heid, E. ; Hornidge, D. ; Jaegle, I. ; Jahn, O. ; Kashevarov, V. ; Keshelashvili, I. ; Knezevic, A. ; Kondratiev, R. ; Korolija, M. ; Krambrich, D. ; Lang, M. ; Lisin, V. ; Livingston, K. ; Lugert, S. ; MacGregor, I. ; Manley, D. ; Martinez, M. ; McGeorge, J. ; Mekterovic, D. ; Metag, V. ; Nefkens, B. ; Nikolaev, A. ; Novotny, R. ; Ostrick, M. ; Pedroni, P. ; Pheron, F. ; Polonski, A. ; Prakhov, S. ; Price, J. ; Rosner, G. ; Rost, M. ; Rostomyan, T. ; Schadmand, S. ; Schumann, S. ; Sober, D. ; Starostin, A. ; Supek, I. ; Tarbert, C. ; Thomas, A. ; Unverzagt, M. ; Watts, D. ; Werthmüller, D. ; Zehr, F.

In: The European Physical Journal A, 2013, vol. 49, no. 3, p. 1-14

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    Title
    • Coherent photoproduction of π0- and η-mesons off 7Li
    Author
    • Maghrbi, Y.. Department of Physics, University of Basel, Ch-4056, Basel, Switzerland
    • Krusche, B.. Department of Physics, University of Basel, Ch-4056, Basel, Switzerland
    • Ahrens, J.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Annand, J.. School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Arends, H.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Beck, R.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Bekrenev, V.. Petersburg Nuclear Physics Institute, RU-188300, Gatchina, Russia
    • Boillat, B.. Department of Physics, University of Basel, Ch-4056, Basel, Switzerland
    • Braghieri, A.. INFN, Sezione di Pavia, I-27100, Pavia, Italy
    • Branford, D.. School of Physics, University of Edinburgh, EH9 3JZ, Edinburgh, UK
    • Briscoe, W.. Center for Nuclear Studies, The George Washington University, 20052, Washington, DC, USA
    • Brudvik, J.. University of California Los Angeles, 90095-1547, Los Angeles, California, USA
    • Cherepnya, S.. Lebedev Physical Institute, RU-119991, Moscow, Russia
    • Codling, R.. School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Downie, E.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Drexler, P.. II. Physikalisches Institut, University of Giessen, D-35392, Giessen, Germany
    • Fil'kov, L.. Lebedev Physical Institute, RU-119991, Moscow, Russia
    • Fix, A.. Laboratory of Mathematical Physics, Tomsk Polytechnic University, Tomsk, Russia
    • Glazier, D.. School of Physics, University of Edinburgh, EH9 3JZ, Edinburgh, UK
    • Gregor, R.. II. Physikalisches Institut, University of Giessen, D-35392, Giessen, Germany
    • Heid, E.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Hornidge, D.. Mount Allison University, New Brunswick, E4L3B5, Sackville, Canada
    • Jaegle, I.. Department of Physics, University of Basel, Ch-4056, Basel, Switzerland
    • Jahn, O.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Kashevarov, V.. Lebedev Physical Institute, RU-119991, Moscow, Russia
    • Keshelashvili, I.. Department of Physics, University of Basel, Ch-4056, Basel, Switzerland
    • Knezevic, A.. Rudjer Boskovic Institute, HR-10000, Zagreb, Croatia
    • Kondratiev, R.. Institute for Nuclear Research, RU-125047, Moscow, Russia
    • Korolija, M.. Rudjer Boskovic Institute, HR-10000, Zagreb, Croatia
    • Krambrich, D.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Lang, M.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Lisin, V.. Institute for Nuclear Research, RU-125047, Moscow, Russia
    • Livingston, K.. School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Lugert, S.. II. Physikalisches Institut, University of Giessen, D-35392, Giessen, Germany
    • MacGregor, I.. School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Manley, D.. Kent State University, 44242, Kent, Ohio, USA
    • Martinez, M.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • McGeorge, J.. School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Mekterovic, D.. Rudjer Boskovic Institute, HR-10000, Zagreb, Croatia
    • Metag, V.. II. Physikalisches Institut, University of Giessen, D-35392, Giessen, Germany
    • Nefkens, B.. University of California Los Angeles, 90095-1547, Los Angeles, California, USA
    • Nikolaev, A.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Novotny, R.. II. Physikalisches Institut, University of Giessen, D-35392, Giessen, Germany
    • Ostrick, M.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Pedroni, P.. INFN, Sezione di Pavia, I-27100, Pavia, Italy
    • Pheron, F.. Department of Physics, University of Basel, Ch-4056, Basel, Switzerland
    • Polonski, A.. Institute for Nuclear Research, RU-125047, Moscow, Russia
    • Prakhov, S.. University of California Los Angeles, 90095-1547, Los Angeles, California, USA
    • Price, J.. University of California Los Angeles, 90095-1547, Los Angeles, California, USA
    • Rosner, G.. School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Rost, M.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Rostomyan, T.. INFN, Sezione di Pavia, I-27100, Pavia, Italy
    • Schadmand, S.. II. Physikalisches Institut, University of Giessen, D-35392, Giessen, Germany
    • Schumann, S.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Sober, D.. The Catholic University of America, 20064, Washington, DC, USA
    • Starostin, A.. University of California Los Angeles, 90095-1547, Los Angeles, California, USA
    • Supek, I.. Rudjer Boskovic Institute, HR-10000, Zagreb, Croatia
    • Tarbert, C.. School of Physics, University of Edinburgh, EH9 3JZ, Edinburgh, UK
    • Thomas, A.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Unverzagt, M.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Watts, D.. School of Physics, University of Edinburgh, EH9 3JZ, Edinburgh, UK
    • Werthmüller, D.. Department of Physics, University of Basel, Ch-4056, Basel, Switzerland
    • Zehr, F.. Department of Physics, University of Basel, Ch-4056, Basel, Switzerland
    Document Type
    • Postprint
    Classification
    • Engineering
    OAI-PMH Identifier
    • oai:doc.rero.ch:319887
    Summary
    Abstract.: Coherent photoproduction of π0-mesons from threshold (E th ≈ 136 MeV) throughout the Δ-resonance region and of η-mesons close to the production threshold (E th ≈ 570 MeV for η has been measured for 7Li nuclei. The experiment was performed using the tagged-photon beam of the Mainz MAMI accelerator with the Crystal Ball and TAPS detectors combined to give an almost 4π solid-angle electromagnetic calorimeter. The reactions were identified by a combined invariant-mass and missing-energy analysis. A comparison of the pion data to plane-wave impulse modelling tests the nuclear mass form factor. So far coherent η production had been only identified for the lightest nuclear systems (2H and 3He . For 3He a large enhancement of the cross section above plane-wave approximations had been reported, indicating the formation of a quasi-bound state. The present Li data for η production agree with a plane-wave approximation. Contrary to 3He , neither a threshold enhancement of the total cross section nor a deviation of the angular distributions from the expected form factor dependence were observed