Photonuclear Reactions at Intermediate Energies

  • Justus H. Koch
Part of the NATO ASI Series book series (NSSB, volume 139)


The characteristic feature of the pion-nucleon interaction at intermediate energies is the excitation of the ∆-resonance, the lowest excited state of the nucleon. This can clearly be seen by looking, for example, at the total π-N cross section as a function of the pion energy (Fig. 1a). This resonance occurs when the pion and nucleon are in a relative p-wave, coupled to a total spin J = 3/2 and isospin T = 3/2. Also the interaction of a photon with a nucleon at these energies is dominated by ∆-excitation. This is illustrated by Fig. 1b, which shows the total photoabsorption cross section for a proton. The ∆-resonance is characterized by a resonance energy ER = 1232 MeV (also referred to as the ∆-mass) and a large decay width of Γ = 110 MeV, which indicates that the ∆ quickly decays again into a pion and a nucleon. In the quark picture, the excitation of a nucleon to a ∆ is described by a spin- and isospin-flip of one of the quarks. For the discussion below this more fundamental explanation of the ∆-resonance is not essential and a more phenomenological approach is chosen.


Photonuclear Reaction Spreading Potential Photoabsorption Cross Section Pion Photoproduction Pauli Blocking 
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  1. 1.
    L.S. Kisslinger and W.L. Wang, Phys. Lett. 30 (1973) 1071;Google Scholar
  2. L.S. Kisslinger and W.L. Wang, Ann. Phys. (NY) 99 (1976) 374ADSCrossRefGoogle Scholar
  3. 2.
    M. Dillig and M.G. Huber, Phys. Lett. B48 (1974) 417Google Scholar
  4. 3.
    W. Weise, Nucl. Phys. A278 (1977) 403Google Scholar
  5. 4.
    M. Hirata, F. Lenz and K. Yazaki, Ann. Phys. (NY) 108 (1977) 116ADSCrossRefGoogle Scholar
  6. 5.
    M. Hirata, J.H. Koch, F. Lenz and E.J. Moniz, Ann. Phys. (NY) 120 (1979) 205ADSCrossRefGoogle Scholar
  7. 6.
    E. Oset and W. Weise, Nucl. Phys. A319 (1979) 477;CrossRefGoogle Scholar
  8. E. Oset and W. Weise, Nucl. Phys. A329 (1979) 365CrossRefGoogle Scholar
  9. 7.
    Y. Horikawa, M. Thies and F. Lenz, Nucl. Phys. A345 (1980) 386CrossRefGoogle Scholar
  10. 8.
    F. Lenz, M. Thies and Y. Horikawa, Ann. Phys. (NY) 140 (1982) 266ADSCrossRefGoogle Scholar
  11. 9.
    M. Thies, Nucl. Phys. A382 (1982) 434CrossRefGoogle Scholar
  12. 10.
    M. Hirata, F. Lenz and M. Thies, Phys. Rev. C28 (1983) 785;MathSciNetADSGoogle Scholar
  13. T. Takaki, SIN-preprint PR-84–06 and Ann. Phys. (1985) to be publishedGoogle Scholar
  14. 11.
    J.H. Koch and E.J. Moniz, Phys. Rev. C20 (1979) 235ADSGoogle Scholar
  15. 12.
    E. Oset and W. Weise, Nucl. Phys. A368 (1981) 375CrossRefGoogle Scholar
  16. 13.
    W. Weise, Nucl. Phys. A358 (1981) 163cADSCrossRefGoogle Scholar
  17. 14.
    K. Klingenbeck and M.G. Huber, J. Phys. G6 (1980) 961Google Scholar
  18. 15.
    A.N. Saharia and R.M. Woloshyn, Phys. Rev. C23 (1981) 351ADSGoogle Scholar
  19. 16.
    J.H. Koch and E.J. Moniz, Phys. Rev. C27 (1983) 751ADSGoogle Scholar
  20. 17.
    J.H. Koch, E.J. Moniz and N. Ohtsuka, Ann. Phys. (NY) 154 (1984) 99ADSCrossRefGoogle Scholar
  21. 18.
    E. Oset and W. Weise, Phys. Lett. 94B (1980) 19CrossRefGoogle Scholar
  22. 19.
    T. Takaki, T. Suzuki and J.H. Koch, Nucl. Phys. A443 (1985) 570CrossRefGoogle Scholar
  23. 20.
    B. Ziegler in ‘Nuclear Physics with Electromagnetic Interactions’ (H. Arenhövel and D. Drechsel, Eds.), Lecture Notes in Physics No. 108, Springer Verlag, New York (1979)Google Scholar
  24. 21.
    J. Arends, J. Eyink, A. Hegerath, K.G. Hilger, B. Mecking, G. Nöldeke and H. Root, Phys. Lett. 398 (1981) 423Google Scholar
  25. 22.
    E.J. Moniz and A. Sevgen, Phys. Rev. C24 (1981) 224ADSGoogle Scholar
  26. 23.
    F.A. Berends, A. Donnachie and D.L. Weaver, Nucl. Phys. 84 (1967) 54;ADSCrossRefGoogle Scholar
  27. F.A. Berends and A. Donnachie, Nucl. Phys. B84 (1975) 342ADSCrossRefGoogle Scholar
  28. 24.
    J.L. Goldberger and K.M. Watson, Collision Theory, Wiley, New York (1964), Chapter 9MATHGoogle Scholar
  29. 25.
    M.G. Olsson, Nucl. Phys. B78 (1974) 55ADSCrossRefGoogle Scholar
  30. 26.
    I. Blomqvist and J.M. Laget, Nucl. Phys. A280 (1977) 405CrossRefGoogle Scholar
  31. 27.
    F. Binon, Nucl. Phys. B17 (1970) 168ADSCrossRefGoogle Scholar
  32. 28.
    H. Byefield et al., Phys. Rev. 86 (1952) 17ADSCrossRefGoogle Scholar
  33. 29.
    E. Bellotti et al., Nuovo Cim. 18A (1973) 75ADSCrossRefGoogle Scholar
  34. 30.
    K. Masutani and K. Yazaki, Nucl. Phys. A407 (1983) 309CrossRefGoogle Scholar
  35. 31.
    H. Rost, Bonn Report IR-80–10 (1980)Google Scholar
  36. 32.
    J. Ahrens et al., in Proc. Int. Conf. on Nuclear Physics, Florence (1983) Vol. I, 356 and to be publishedGoogle Scholar
  37. 33.
    P. Carlos et al., Nucl. Phys. A43 (1984) 573Google Scholar
  38. 34.
    R. Cenni, P. Christillin and G. Dillon, Phys. Lett. 139B (1984) 341CrossRefGoogle Scholar
  39. 35.
    J.H. Koch and N. Ohtsuka, Nucl. Phys. A435 (1985) 765CrossRefGoogle Scholar
  40. 36.
    E. Hayward and B. Ziegler, Nucl. Phys. A414 (1984) 333CrossRefGoogle Scholar
  41. 37.
    J. Miller, private communicationGoogle Scholar
  42. 38.
    J. Ahrens et al., Z. Phys. A311 (1983) 367ADSGoogle Scholar
  43. 39.
    J.J. Comuzzi, MIT-Dissertation (1983), unpublished; and R.P. Redwine et al., private communicationGoogle Scholar

Copyright information

© Plenum Press, New York 1986

Authors and Affiliations

  • Justus H. Koch
    • 1
  1. 1.NIKHEF-KAmsterdamThe Netherlands

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