Fulltext

Photoproduction of $ \pi^{0}$ -pairs off protons and off neutrons

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

In: The European Physical Journal A, 2015, vol. 51, no. 11, p. 1-18

Ajouter à la liste personnelle
    Titre
    • Photoproduction of $ \pi^{0}$ -pairs off protons and off neutrons
    Auteur
    • Dieterle, M.. Department of Physics, University of Basel, CH-4056, Basel, Switzerland
    • Oberle, M.. Department of Physics, University of Basel, CH-4056, Basel, Switzerland
    • Ahrens, J.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Annand, J.. SUPA 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
    • Bartolome, P.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Beck, R.. Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, D-53115, Bonn, Germany
    • Bekrenev, V.. Petersburg Nuclear Physics Institute, RU-188300, Gatchina, Russia
    • Berghäuser, H.. II. Physikalisches Institut, University of Giessen, D-35392, Giessen, Germany
    • Braghieri, A.. INFN Sezione di Pavia, I-27100 Pavia, Pavia, Italy
    • Branford, D.. SUPA 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
    • Costanza, S.. INFN Sezione di Pavia, I-27100 Pavia, Pavia, Italy
    • Demissie, B.. Center for Nuclear Studies, The George Washington University, 20052, Washington, DC, USA
    • 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
    • Garni, S.. Department of Physics, University of Basel, CH-4056, Basel, Switzerland
    • Glazier, D.. SUPA School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Hamilton, D.. SUPA 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, E4L1E6, New Brunswick, Canada
    • Howdle, D.. SUPA School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Huber, G.. University of Regina, SK S4S-0A2, Regina, Canada
    • Jahn, O.. Institut für Kernphysik, University of Mainz, D-55099, Mainz, Germany
    • Jude, T.. SUPA School of Physics, University of Edinburgh, EH9 3JZ, Edinburgh, UK
    • Käser, A.. Department of Physics, University of Basel, CH-4056, Basel, Switzerland
    • Kashevarov, V.. Lebedev Physical Institute, RU-119991, Moscow, Russia
    • Keshelashvili, I.. Department of Physics, University of Basel, CH-4056, Basel, Switzerland
    • Kondratiev, R.. Institute for Nuclear Research, RU-125047, Moscow, Russia
    • Korolija, M.. Rudjer Boskovic Institute, HR-10000, Zagreb, Croatia
    • Krusche, B.. Department of Physics, University of Basel, CH-4056, Basel, Switzerland
    • Lisin, V.. Institute for Nuclear Research, RU-125047, Moscow, Russia
    • Livingston, K.. SUPA School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • MacGregor, I.. SUPA 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.. SUPA School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • Manley, D.. Kent State University, 44242, Kent, Ohio, USA
    • Marinides, Z.. Center for Nuclear Studies, The George Washington University, 20052, Washington, DC, USA
    • McGeorge, J.. SUPA School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • McNicoll, E.. SUPA 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
    • Micanovic, S.. Rudjer Boskovic Institute, HR-10000, Zagreb, Croatia
    • Middleton, D.. Mount Allison University, E4L1E6, New Brunswick, Canada
    • Mushkarenkov, A.. INFN Sezione di Pavia, I-27100 Pavia, Pavia, Italy
    • Nikolaev, A.. Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, D-53115, Bonn, 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
    • Otte, P.. 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 Sezione di Pavia, I-27100 Pavia, 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.. SUPA School of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK
    • 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.. SUPA 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
    • Strub, Th. Department of Physics, University of Basel, CH-4056, Basel, Switzerland
    • Supek, I.. Rudjer Boskovic Institute, HR-10000, Zagreb, Croatia
    • Thiel, M.. II. Physikalisches Institut, University of Giessen, D-35392, Giessen, 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
    • Walford, N.. Department of Physics, University of Basel, CH-4056, Basel, Switzerland
    • Watts, D.. SUPA School of Physics, University of Edinburgh, EH9 3JZ, Edinburgh, UK
    • Werthmüller, D.. Department of Physics, University of Basel, CH-4056, Basel, Switzerland
    • Witthauer, L.. Department of Physics, University of Basel, CH-4056, Basel, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • The European Physical Journal A, 2015, vol. 51, no. 11, p. 1-18. Springer Berlin Heidelberg
    Autre version électronique
    Classification
    • Technologie, Sciences de l'ingénieur
    Identifiant OAI-PMH
    • oai:doc.rero.ch:330967
    Summary
    Abstract.: Total cross sections, angular distributions, and invariant-mass distributions have been measured for the photoproduction of $ \pi^{0}\pi^{0}$ pairs off free protons and off nucleons bound in the deuteron. The experiments were performed at the MAMI accelerator facility in Mainz using the Glasgow photon tagging spectrometer and the Crystal Ball/TAPS detector. The accelerator delivered electron beams of 1508 and 1557MeV, which produced bremsstrahlung in thin radiator foils. The tagged photon beam covered energies up to 1400MeV. The data from the free proton target are in good agreement with previous measurements and were only used to test the analysis procedures. The results for differential cross sections (angular distributions and invariant-mass distributions) for free and quasi-free protons are almost identical in shape, but differ in absolute magnitude up to 15%. Thus, moderate final-state interaction effects are present. The data for quasi-free neutrons are similar to the proton data in the second resonance region (final-state invariant masses up to $ \approx 1550$ MeV), where both reactions are dominated by the $ N(1520)3/2^{-} \rightarrow \Delta(1232)3/2^{+}\pi$ decay. At higher energies, angular and invariant-mass distributions are different. A simple analysis of the shapes of the invariant-mass distributions in the third resonance region is consistent with strong contributions of an $ N^{\star}\rightarrow N\sigma$ decay for the proton, while the reaction is dominated by a sequential decay via a $ \Delta\pi$ intermediate state for the neutron. The data are compared to predictions from the Two-Pion-MAID model and the Bonn-Gatchina coupled-channel analysis.