Sharp (e+e) Pairs: Alternative Paths to Escape the Heavy Ion Impasse

  • James J. Griffin


The present status of the whole “Sharp Lepton Problem”, which includes a variety of QED-related processes as well as the heavy ion data of the “(e+e) Puzzle”, is assessed. The heavy ion segment of the sharp (e+e) pairs studies is shown to have reached an impasse, in which the sharp pairs can neither be definitively excluded, nor definitively validated.


Integrate Cross Section Average Cross Section Pair Production Cross Section Nuclear Excited State Pair Emission 
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  1. 1.
    M. Sakai et al., Phys.Rev. C38, 1971 (1988).ADSGoogle Scholar
  2. 2.
    M. Sakai et al., Phys.Rev. C44, R944 (1991).ADSGoogle Scholar
  3. 3.
    M. Sakai et al., in Nuclear Physics of Our Times, edited by A.V. Ramayya (World Scientific, Singapore, 1993), pp. 313–321, see also U. of Tokyo, I.N.S. Report No.957, Dec. 1992.Google Scholar
  4. 4.
    M. Sakai et al., Phys.Rev. C47, 1595 (1993), and earlier refs. cited there.ADSGoogle Scholar
  5. 5.
    A. Zilges et al., Phys.Rev. C52, R468 (1995).ADSGoogle Scholar
  6. 6.
    C. I. Westbrook et al., Phys.Rev.Lett. 58, 1328 (1987).ADSCrossRefGoogle Scholar
  7. 7.
    A. P. Mills and S. Chu, in Quantum Electrodynamics, edited by T. Kinoshita (World Scientific, Singapore, 1990), p. 774.Google Scholar
  8. 8.
    C. I. Westbrook, D. Gidley, A. Rich, and P.W. Zitsewitz, Phys.Rev.A 40, 5489 (1989).ADSCrossRefGoogle Scholar
  9. 9.
    J. Nico, D. Gidley, and A. Rich, Phys.Rev.Lett. 65, 1344 (1990).ADSCrossRefGoogle Scholar
  10. 10.
    G. Adkins et al., Phys.Rev.A 45, 7774 (1992), and earlier References cited therein.ADSCrossRefGoogle Scholar
  11. 11.
    S. Karshenboim, Phys. At. Nucl.(Yad.Fiz.) 56, 1710 (1993).Google Scholar
  12. 12.
    P.L. Labelle and P. Lepage, Phys.Rev.Lett. 72, 2006 (1994).ADSCrossRefGoogle Scholar
  13. 13.
    S. Asai, S. Orito, and N. Shinohara, Phys.Lett. B357, (1995).Google Scholar
  14. 14.
    D. L. Burke et al., Phys.Rev.Lett. 79, 1626 (1997).ADSCrossRefGoogle Scholar
  15. 15.
    J. J. Griffin, J.Phys.Soc.Jpn. 58, S427 (1989).Google Scholar
  16. 16.
    J. J. Griffin, Intl.J.Mod.Phys. A6, 1985 (1991).ADSCrossRefGoogle Scholar
  17. 17.
    J. J. Griffin, Phys.Rev.Lett. 66, 1426 (1991).ADSCrossRefGoogle Scholar
  18. 18.
    J. J. Griffin, Phys.Rev. C47, 351 (1993).ADSGoogle Scholar
  19. 19.
    J. J. Griffin, Can. J.Phys. 74, 527 (1996), and earlier References cited therein.ADSCrossRefGoogle Scholar
  20. 20.
    T. E. Cowan et al., Phys.Rev.Lett. 56, 444 (1986).ADSCrossRefGoogle Scholar
  21. 21.
    T. E. Cowan et al., in Physics of Strong Fields, edited by W. Greiner (Plenum Press, New York, 1987), p. 111.CrossRefGoogle Scholar
  22. 22.
    P. Salabura et al., Phys.Lett. B245, 153 (1990).ADSGoogle Scholar
  23. 23.
    H. Bokemeyer, (1989), habilitation thesis (U. of Frankfurt,1989): Report No.GSI-90-11.Google Scholar
  24. 24.
    APEX, (February, 1989), a USDOE Proposal for an Atlas Positron ExperimentGoogle Scholar
  25. 25.
    I. Ahmad et al., Phys.Rev.Lett. 75, 2658 (1995).ADSCrossRefGoogle Scholar
  26. 26.
    M. R. Wolanski, Ph.D. thesis, U. of Chicago, Aug. 1995.Google Scholar
  27. 27.
    R. Baer et al., Nucl.Phys.A A583, 237 (1995).ADSCrossRefGoogle Scholar
  28. 28.
    R. Ganz et al., Phys.Lett. B389, 4 (1996).ADSGoogle Scholar
  29. 29.
    J. Baumann, (1996), dissertation (Univ. Heidelberg): Report No.GSI-96-05.Google Scholar
  30. 30.
    J. J. Griffin, Univ. of MD. PP No.97-087 (Feb.1997), nucl-th/9703041.Google Scholar
  31. 31.
    J. J. Griffin, Univ. of MD. PP. No.97-080 (Feb.1997), nucl-th/9703006.Google Scholar
  32. 32.
    J. Schweppe et al., Phys.Rev.Lett. 51, 2261 (1983).ADSCrossRefGoogle Scholar
  33. 33.
    T. Cowan et al., Phys.Rev.Lett. 54, 1761 (1985).ADSCrossRefGoogle Scholar
  34. 34.
    W. Koenig et al., Z.Phys. A328, 129 (1987).ADSGoogle Scholar
  35. 35.
    A. Ahmad et al., Phys.Rev.Lett. 78, 618 (1997).ADSCrossRefGoogle Scholar
  36. 36.
    E. Berdermann et al., Nucl.Phys. A488, 683c (1988).ADSGoogle Scholar
  37. 37.
    W. Koenig et al., Phys.Lett. B218, 12 (1989).ADSGoogle Scholar
  38. 38.
    I. Koenig et al., Z.Phys. A346, 153 (1993).ADSGoogle Scholar
  39. 39.
    K. Erb et al., Phys.Lett. B181, 52 (1986).ADSGoogle Scholar
  40. 40.
    R. Peckhaus et al., Phys.Rev. C36, 83 (1987).ADSGoogle Scholar
  41. 41.
    T. F. Wang et al., Phys.Rev. C36, 2136 (1987).ADSGoogle Scholar
  42. 42.
    C. Bargholz et al., Phys.Rev. C40, 1188 (1989).ADSGoogle Scholar
  43. 43.
    J. J. Griffin, in Topics in Atomic and Nuclear Collisions, edited by A. Calboreanu and V. Zoran (Plenum Press, New York, 1994), p. 419.CrossRefGoogle Scholar
  44. 44.
    J. J. Griffin, in Proc. 8th Int’l Conf. on Nuclear Reaction Mechanisms, edited by E. Gadioli (U. of Milano, Milan, Italy, 1997), p. 493.Google Scholar
  45. 45.
    J. J. Griffin, in Int’l Conf m Memory of Prof.C.S.Wu, edited by F. Wang (World Scientific Press, Hong Kong, PRC, 1998), pp. XXX, in press.Google Scholar
  46. 46.
    I. Ahmad et al., Phys.Rev.Lett. 77, 2839 (1996).ADSCrossRefGoogle Scholar
  47. 47.
    T. E. Cowan and J. Greenberg, Phys.Rev.Lett. 77, 2838 (1996).ADSCrossRefGoogle Scholar
  48. 48.
    H. Tsertos, Phys.Rev. C40, 1839 (1989).ADSGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • James J. Griffin
    • 1
  1. 1.Department of PhysicsUniversity of MarylandCollege ParkUSA

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