Coherent π° Photoproduction in the Isobar-Hole Formalism

  • J. H. Koch
  • E. J. Moniz


Coherent π° photoproduction is expected to provide a rather clean test of our understanding of the pion optical potential. As a production reaction, it is sensitive to the pion wavefunction inside the nucleus and not just to the phase shifts measured in elastic pion scattering. As a photoreaction, the reaction mechanism is comparatively well understood. Previous calculations have used the standard DWIA approach with a first order pion optical potential. These do not agree with the somewhat ancient data available for production in the resonance region. Recently, the isobar-hole formalism1-4 has led to a detailed and quite successful description for π-160 scattering in the resonance region, and our aim in this note is to show some results of applying the same formalism to the coherent 160(γ,π°) 160 reaction. We shall discuss the way in which the isobar-hole formalism goes beyond the DWIA framework and the extent to which the (γ,π°) cross section is sensitive to different phase-shift-equivalent descriptions of the pion-nucleus dynamics.


Partial Wave Clean Test Nuclear Ground State Doorway State Plane Wave Impulse Approximation 
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Notes and References

  1. 1.
    L. Kisslinger and W. Wang, Ann. Phys. 99 (1976) 374.ADSCrossRefGoogle Scholar
  2. 2.
    M. Kirata, F. Lenz and K. Yazaki, Ann. Phys. 108 (1977) 116.ADSCrossRefGoogle Scholar
  3. 3.
    M. Hirata, J.H. Koch, F. Lenz and E.J. Moniz, Phys. Lett. 108 (1977) 281.Google Scholar
  4. U. M. Hirata, J.H. Koch, F. Lenz and E.J. Moniz, to be published.Google Scholar
  5. 5.
    E.J. Moniz, invited paper elsewhere in this volume.Google Scholar
  6. 6.
    R. Woloshyn, TRIUMF preprint.Google Scholar
  7. 7.
    J.H. Koch and E.J. Moniz, to be published.Google Scholar

Copyright information

© Plenum Press, New York 1979

Authors and Affiliations

  • J. H. Koch
    • 1
  • E. J. Moniz
    • 2
  1. 1.Institut voor Kernphysik OnderzoekAmsterdamThe Netherlands
  2. 2.Center for Theoretical Physics Laboratory for Nuclear Science and Department of PhysicsMassachusetts Institute of TechnologyCambridgeUSA

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