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Coherent and incoherent π0 photoproduction from the deuteron

  • U. Siodlaczek
  • P. Achenbach
  • J. Ahrens
  • J.R.M. Annand
  • H.-J. Arends
  • R. Beck
  • R. Bilger
  • H. Clement
  • V. Hejny
  • M. Kotulla
  • B. Krusche
  • V. Kuhr
  • R. Leukel
  • J.C. McGeorge
  • V. Metag
  • R. Novotny
  • V. Olmos de León
  • F. Rambo
  • M. Schepkin
  • A. Schmidt
  • I. Seluzhenkov
  • H. Ströher
  • G.J. Wagner
  • Th. Walcher
  • J. Weiß
  • F. Wissmann
  • M. Wolf

Abstract:

Differential cross-sections for the reactions d (γ,π0)d and d (γ,π0)pn have been measured at MAMI with the TAPS detector setup in the energy range 140 MeV < Eγ < 306 MeV. By use of the Glasgow tagging spectrometer an 0.8 MeV energy resolution for photons incident on the target was achieved. The π0 missing energy resolution was sufficient for a reliable separation of coherent and incoherent channels. The data for the break-up channel exhibit very strong final state interaction effects, whereas the observed angular dependence of the inclusive process d (γ,π0)X is in quantitative agreement with predictions for a quasi-free process. The observed absolute d (γ,π0)X cross-sections, on the other hand, are significantly smaller than predicted by the quasi-free process for Eγ >∼ 250 MeV. Associating this failure with the π0 photoproduction on the neutron would suggest that its cross-section is up to 25% below the presently believed value.

PACS. 13.60.Le Meson production – 25.20.Lj Photoproduction reactions 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2001

Authors and Affiliations

  • U. Siodlaczek
    • 1
  • P. Achenbach
    • 2
  • J. Ahrens
    • 3
  • J.R.M. Annand
    • 8
  • H.-J. Arends
    • 3
  • R. Beck
    • 3
  • R. Bilger
    • 1
  • H. Clement
    • 1
  • V. Hejny
    • 4
  • M. Kotulla
    • 2
  • B. Krusche
    • 7
  • V. Kuhr
    • 5
  • R. Leukel
    • 3
  • J.C. McGeorge
    • 8
  • V. Metag
    • 2
  • R. Novotny
    • 2
  • V. Olmos de León
    • 3
  • F. Rambo
    • 5
  • M. Schepkin
    • 6
  • A. Schmidt
    • 3
  • I. Seluzhenkov
    • 6
  • H. Ströher
    • 4
  • G.J. Wagner
    • 1
  • Th. Walcher
    • 3
  • J. Weiß
    • 2
  • F. Wissmann
    • 5
  • M. Wolf
    • 2
  1. 1.Physikalisches Institut, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, GermanyDE
  2. 2.II. Physikalisches Institut, Universität Gieß en, D-35392 Gießen, GermanyDE
  3. 3.Institut für Kernphysik, Universität Mainz, D-55099 Mainz, GermanyDE
  4. 4.Institut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich, GermanyDE
  5. 5.II. Physikalisches Institut, Universität Göttingen, D-37073 Göttingen, GermanyDE
  6. 6.Institute for Theoretical and Experimental Physics, Moscow 117218, RussiaRU
  7. 7.Institut für Physik und Astronomie, Universität Basel, Klingelbergstr. 82, CH-4056 Basel, SwitzerlandCH
  8. 8.Department of Physics and Astronomy, University of Glasgow, Glasgow G128 QQ, UKGB

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