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Radiative π0 photoproduction on protons in the Δ+ (1232) region

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Abstract

The reaction γp → pπ 0γ′ has been measured with the Crystal Ball/TAPS detectors using the energy-tagged photon beam at the electron accelerator facility MAMI-B. Energy and angular differential cross-sections for the emitted photon γ′ and angular differential cross-sections for the π0 have been determined with high statistics in the energy range of the Δ+ (1232)-resonance. Cross-sections and the ratio of the cross-section to the nonradiative process γp → pπ 0 are compared to theoretical reaction models, having the anomalous magnetic moment κ Δ as free parameter. As the shape of the experimental distributions is not reproduced in detail by the model calculations, currently no extraction of κ Δ is feasible.

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Authors and Affiliations

  1. Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Mainz, Germany

    S. Schumann, E. J. Downie, P. Aguar-Bartolomé, J. Ahrens, H. J. Arends, R. Beck, E. Heid, O. Jahn, D. Krambrich, M. Lang, M. Martinez-Fabregate, A. Nikolaev, M. Ostrick, M. Rost, A. Thomas, M. Unverzagt & Th. Walcher

  2. Helmholtz-Institut für Strahlen- und Kernphysik, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany

    S. Schumann, R. Beck, M. Lang, A. Nikolaev & M. Unverzagt

  3. Institut für Physik, Universität Basel, Basel, Switzerland

    B. Boillat, B. Krusche & F. Zehr

  4. Department of Physics and Astronomy, University of Glasgow, Glasgow, UK

    E. J. Downie, J. R. M. Annand, R. Codling, K. Livingston, I. J. D. MacGregor, J. C. McGeorge, R. O. Owens & G. Rosner

  5. Petersburg Nuclear Physics Institute, Gatchina, Russia

    V. Bekrenev

  6. INFN Sezione di Pavia, Pavia, Italy

    A. Braghieri, P. Pedroni & T. Rostomyan

  7. School of Physics, University of Edinburgh, Edinburgh, UK

    D. Branford, D. I. Glazier, C. M. Tarbert & D. P. Watts

  8. Center for Nuclear Studies, The George Washington University, Washington, D.C., USA

    W. J. Briscoe

  9. University of California at Los Angeles, Los Angeles, CA, USA

    J. W. Brudvik, B. M. K. Nefkens, S. N. Prakhov, J. W. Price & A. Starostin

  10. Lebedev Physical Institute, Moscow, Russia

    S. Cherepnya, L. V. Fil’kov & V. L. Kashevarov

  11. II. Physikalisches Institut, Justus Liebig-Universität Gießen, Gießen, Germany

    P. Drexler, R. Gregor, M. Kotulla, S. Lugert, V. Metag & R. Novotny

  12. Mount Allison University, Sackville, NB, Canada

    D. Hornidge

  13. Institute for Nuclear Research, Moscow, Russia

    R. Kondratiev, V. Lisin & A. Polonski

  14. Rudjer Boskovic Institute, Zagreb, Croatia

    M. Korolija, D. Mekterovic & I. Supek

  15. Kent State University, Kent, OH, USA

    D. M. Manley

  16. The Catholic University of America, Washington, D.C., USA

    D. Sober

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  1. S. Schumann
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  2. B. Boillat
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The Crystal Ball at MAMI, TAPS and A2 Collaborations

Corresponding author

Correspondence to S. Schumann.

Additional information

Communicated by T. Hennino

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The Crystal Ball at MAMI, TAPS and A2 Collaborations., Schumann, S., Boillat, B. et al. Radiative π0 photoproduction on protons in the Δ+ (1232) region. Eur. Phys. J. A 43, 269–282 (2010). https://doi.org/10.1140/epja/i2010-10925-y

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  • DOI: https://doi.org/10.1140/epja/i2010-10925-y

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