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Future Aspects of Positron Spectroscopy

  • H. Backe

Abstract

In the first week of this conference experimentalists made us familiar with the features of the positron peaks observed in the collision of very heavy ions with atoms. We learned that these peaks are not understandable in terms of known positron production mechanisms like monoenergetic pair decay of excited nuclear levels or the proposed spontaneous positron production in superheavy atoms. In addition, theorists told us that, at present, also the interpretation that the positron peak structures originate from the decay of a previously not observed neutral particle is in contradiction to well-known experimental facts. Some of you may have, in addition, become confused by the results of the three experimental groups which, at first glance, sometimes may look contradictory. Therefore, I will try to summarize and to discuss in this contribution the most important experimental observations of the EPOS, ORANGE and TORI groups and to formulate, using this as a starting point, the open questions for future experimental investigations.

Keywords

Neutral Particle Collision System NATO Advance Study Institute Slow Positron Positron Spectrum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    T. Cowan, H. Backe, M. Begemann, K. Bethge, H. Bokemeyer, H. Folger, J.S. Greenberg, H. Grein, A. Gruppe, K. Kido, M. Klüver, D. Schwalm, J. Schweppe, K.E. Stiebing, N. Traut mann and P. Vincent, Phys. Rev. Lett. 54 (1985) 1761.ADSCrossRefGoogle Scholar
  2. 2.
    H. Tsertos, E. Berdermann, F. Bosch, M. Clemente, P. Kienle W. Koenig, C. Kozhuharov and W. Wagner, Phys. Lett. 162B (1985) 273.ADSGoogle Scholar
  3. 3.
    J. Reinhardt, B. Müller and W. Greiner, Phys. Rev. A24 (1981) 103.ADSGoogle Scholar
  4. 4.
    J. Reinhardt, U. Müller, B. Muller and W. Greiner, Z. Physik A303 (1981) 173.ADSGoogle Scholar
  5. 5.
    R. Krieg, E. Bozek, U. Gollerthan, E. Kankeleit, G. Klotz-Engmann, M. Krämer, U. Meyer, H. Oeschler and P. Senger, Phys. Rev. C34 (1986) 562.ADSGoogle Scholar
  6. 6.
    D. Schwalm, in: Electronic and Atomic Collisions, XIII. ICPEAC, Invited Papers, eds: J. Eichler, I.V. Hertel, N. Stolterfoht, Amsterdam, Elsevir Sc. Publ., North Holland 1984, p. 295.Google Scholar
  7. 7.
    see articles in Proc. NATO Advanced Studies Institute, Quantum Electrodynamics of Strong Fields, Lahnstein 1981, ed: W. Greiner ( Plenum Press, New York 1983 ).Google Scholar
  8. 8.
    H. Bokemeyer, K. Bethge, H. Folger, J.S. Greenberg, H. Grein, A. Gruppe, S. Ito, R. Schule, J. Schweppe, N. Trautmann, P. Vincent and M. Waldschmidt, in: Proc. NATO Advanced Studies Institute, Quantum Electrodynamics of Strong Fields, Lahnstein 1981 (Plenum Press, New York) p. 273.Google Scholar
  9. 9.
    U. Müller, T. de Reus, J. Reinhardt, B. Müller and W. Greiner, Z. Physik A323 (1986) 261.ADSGoogle Scholar
  10. 10.
    H. Bokemeyer, H. Folger, H. Grein, T. Cowan, J.S. Greenberg, J. Schweppe, A. Balanda, K. Bethge, A. Gruppe, K. Sakaguchi, K.E. Stiebing, D. Schwalm, P. Vincent, H. Backe, M. Begemann, M. Klüver, N. Trautmann, GSI Scient. Rep. 1984, GSI 85–1 (1985) 177.Google Scholar
  11. 11.
    F. Bosch, P. Kienle, W. Koenig, C. Kozhuharov, E. Berdermann, M. Franosch, S. Huchler, J. Kemmer, H. Tsertos and W. Wagner, GSI Scient. Rep. 1985, GSI 86–1 (1986) 179.Google Scholar
  12. 12.
    W.E. Stephens, H. Staub, Phys. Rev. 109 (1958) 1196.Google Scholar
  13. 13.
    W.E. Meyerhof, R. Anholt, Y. El Masri, D. Cline, F.S. Stephens and R. Diamonds, Phys. Lett. B69 (1977) 41.Google Scholar
  14. 14.
    M. Heykants, M. Niecke, Nucl. Phys. A332 (1979) 22.Google Scholar
  15. 15.
    H. Backe, P. Senger, W. Bonin, E. Kankeleit, M. Krämer, R. Krieg, V.. Metag, N. Trautmann and J.B. Wilhelmy, Phys. Rev. Lett. 50 (1983) 1838.Google Scholar
  16. 16.
    T. Cowan, H. Backe, K. Bethge, H. Bokemeyer, H. Folger, J.S. Greenberg, K. Sakaguchi, D. Schwalm, J. Schweppe, K.E. Stiebing and P. Vincent, Phys. Rev. Lett. 56 (1986) 444.Google Scholar
  17. 17.
    A.B. Balentekin, contribution at this conference.Google Scholar
  18. 18.
    J. Reinhardt, contribution at this conference.Google Scholar
  19. 19.
    B. Müller, contribution at this conference.Google Scholar
  20. 20.
    T. Cowan, contribution at this conference.Google Scholar
  21. 21.
    P. Schlüter, U. Müller, G. Soff, Th. de Reus, J. Reinhardt, W. Greiner, Z. Physik 323 (1986) 139.Google Scholar
  22. 22.
    J. Schweppe, A. Gruppe, K. Bethge, H. Bokemeyer, T. Cowan, H. Folger, J.S. Greenberg, H. Grein, S. Ito, R. Schulé, D. Schwalm, N. Trautmann, P. Vincent, M. Waldschmidt, Phys. Rev. Lett. 51 (1983) 2261.Google Scholar
  23. 23.
    B. Blank, E. Bozek, H. Jäger, E. Kankeleit, G. Klotz-Engmann, M. Kramer, R. Krieg, U. Meyer, H. Oeschler, M. Rhein, P. Senger, GSI Scient. Rep. 1985, GSI 86–1 (1986) 180.Google Scholar
  24. 24.
    H. Backe, L. Richter, R. Willwater, E. Kankeleit, E. Kuphal, Y. Nakayama and B. Martin, Z. Physik A285 (1977) 159.Google Scholar
  25. 25.
    E. Kankeleit, H. Oeschler, private communication.Google Scholar
  26. 26.
    F. Bosch, discussion remark.Google Scholar
  27. 27.
    P. Kienle, Talk presented at “Nucleus-Nucleus Collisions from the Coulomb Barrier up to the Quark-Gluon-Plasma”, Erice, Italy, April 10–22, 1985, GSI-85-31 PREPRINT, August 1985.Google Scholar
  28. 28.
    A. Picard, diploma thesis, Universität Mainz 1986, unpublished and G. Werth, private communication; see also: M. Begemann, G. Gräff, H. Herminghaus, H. Kalinowsky, R. Ley, Nucl. Instr. Meth. 201 (1982) 287.Google Scholar
  29. 29.
    A. Seeger, MPI für Metallforschung, Stuttgart, private communication.Google Scholar
  30. 30.
    H. Bokemeyer, et al., contribution at this conference.Google Scholar
  31. 31.
    W. Koenig, et al., contribution at this conference.Google Scholar
  32. 32.
    H. Oeschler, et al., contribution at this conference.Google Scholar
  33. 33.
    M. Krämer, et al., contribution at this conference.Google Scholar

Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • H. Backe
    • 1
  1. 1.Institut für PhysikUniversität MainzMainzFed. Rep. of Germany

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