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Quasi-free photoproduction of η -mesons off 3He nuclei

Witthauer, L. ; Werthmüller, D. ; Keshelashvili, I. ; Aguar-Bartolomé, P. ; Ahrens, J. ; Annand, J. ; Arends, H. ; Bantawa, K. ; Beck, R. ; Bekrenev, V. ; Braghieri, A. ; Branford, D. ; Briscoe, W. ; Brudvik, J. ; Cherepnya, S. ; Demissie, B. ; Dieterle, M. ; Downie, E. ; Drexler, P. ; Fil'kov, L. ; Fix, A. ; Glazier, D. ; Hamilton, D. ; Heid, E. ; Hornidge, D. ; Howdle, D. ; Huber, G. ; Jaegle, I. ; Jahn, O. ; Jude, T. ; Käser, A. ; Kashevarov, V. ; Kondratiev, R. ; Korolija, M. ; Kruglov, S. ; Krusche, B. ; Kulbardis, A. ; Lisin, V. ; Livingston, K. ; MacGregor, I. ; Maghrbi, Y. ; Mancell, J. ; Manley, D. ; Marinides, Z. ; Martinez, M. ; McGeorge, J. ; McNicoll, E. ; Metag, V. ; Middleton, D. ; Mushkarenkov, A. ; Nefkens, B. ; Nikolaev, A. ; Novotny, R. ; Oberle, M. ; Ostrick, M. ; Oussena, B. ; Pedroni, P. ; Pheron, F. ; Polonski, A. ; Prakhov, S. ; Robinson, J. ; Rosner, G. ; Rost, M. ; Rostomyan, T. ; Schumann, S. ; Sikora, M. ; Sober, D. ; Starostin, A. ; Supek, I. ; Thiel, M. ; Thomas, A. ; Unverzagt, M. ; Watts, D.

In: The European Physical Journal A, 2013, vol. 49, no. 12, p. 1-18

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    Title
    • Quasi-free photoproduction of η -mesons off 3He nuclei
    Author
    • Witthauer, L.. Department of Physics, University of Basel, CH-4056, Basel, Switzerland
    • Werthmüller, D.. Department of Physics, University of Basel, CH-4056, Basel, Switzerland
    • Keshelashvili, I.. Department of Physics, University of Basel, CH-4056, Basel, Switzerland
    • Aguar-Bartolomé, P.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • 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
    • Bantawa, K.. Kent State University, 44242, Kent, Ohio, USA
    • Beck, R.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Bekrenev, V.. Petersburg Nuclear Physics Institute, RU-188300, Gatchina, Russia
    • Braghieri, A.. INFN, I-27100, Pavia, Italy
    • Branford, D.. School of Physics, University of Edinburgh, EH9 3JZ, Edinburgh, UK
    • Briscoe, W.. Institute 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
    • Demissie, B.. Institute for Nuclear Studies, The George Washington University, 20052, Washington, DC, USA
    • Dieterle, M.. Department of Physics, University of Basel, CH-4056, Basel, Switzerland
    • 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
    • Hamilton, D.. School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Heid, E.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Hornidge, D.. Mount Allison University, E4L 1E6, Sackville, Canada
    • Howdle, D.. School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Huber, G.. University of Regina, SK S4S-0A2, Regina, 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
    • Jude, T.. School of Physics, University of Edinburgh, EH9 3JZ, Edinburgh, UK
    • Käser, A.. Department of Physics, University of Basel, CH-4056, Basel, Switzerland
    • Kashevarov, V.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Kondratiev, R.. Institute for Nuclear Research, RU-125047, Moscow, Russia
    • Korolija, M.. Rudjer Boskovic Institute, HR-10000, Zagreb, Croatia
    • Kruglov, S.. Petersburg Nuclear Physics Institute, RU-188300, Gatchina, Russia
    • Krusche, B.. Department of Physics, University of Basel, CH-4056, Basel, Switzerland
    • Kulbardis, A.. Petersburg Nuclear Physics Institute, RU-188300, Gatchina, Russia
    • Lisin, V.. Institute for Nuclear Research, RU-125047, Moscow, Russia
    • Livingston, K.. School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • MacGregor, I.. School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Maghrbi, Y.. Department of Physics, University of Basel, CH-4056, Basel, Switzerland
    • Mancell, J.. School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Manley, D.. Kent State University, 44242, Kent, Ohio, USA
    • Marinides, Z.. Institute for Nuclear Studies, The George Washington University, 20052, Washington, DC, 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
    • McNicoll, E.. School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Metag, V.. II. Physikalisches Institut, University of Giessen, D-35392, Giessen, Germany
    • Middleton, D.. Mount Allison University, E4L 1E6, Sackville, Canada
    • Mushkarenkov, A.. INFN, I-27100, Pavia, Italy
    • 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
    • Oberle, M.. Department of Physics, University of Basel, CH-4056, Basel, Switzerland
    • Ostrick, M.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Oussena, B.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Pedroni, P.. INFN, 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.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Robinson, J.. School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • 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.. Department of Physics, University of Basel, CH-4056, Basel, Switzerland
    • Schumann, S.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Sikora, M.. School of Physics, University of Edinburgh, EH9 3JZ, Edinburgh, UK
    • 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
    • Thiel, M.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • 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
    Document Type
    • Postprint
    Classification
    • Engineering
    OAI-PMH Identifier
    • oai:doc.rero.ch:321175
    Summary
    Quasi-free photoproduction of η-mesons has been measured off nucleons bound in 3He nuclei for incident photon energies from the threshold region up to 1.4 GeV. The experiment was performed at the tagged photon facility of the Mainz MAMI accelerator with an almost 4π covering electromagnetic calorimeter, combining the TAPS and Crystal Ball detectors. The η-mesons were detected in coincidence with the recoil nucleons. This allowed a comparison of the production cross section off quasi-free protons and quasi-free neutrons and a full kinematic reconstruction of the final state, eliminating effects from nuclear Fermi motion. In the S11(1535) resonance peak, the data agree with the neutron/proton cross section ratio extracted from measurements with deuteron targets. More importantly, the prominent structure observed in photoproduction off quasi-free neutrons bound in the deuteron is also clearly observed. Its parameters (width, strength) are consistent with the expectations from the deuteron results. On an absolute scale the cross sections for both quasi-free protons and neutrons are suppressed with respect to the deuteron target pointing to significant nuclear final-state interaction effects