K+ Production in the System Ni+Ni at an Incident Energy of 1.93 AGeV

  • Dieter Best


The investigation of K+ production in heavy ion collisions is interesting for several reasons. Relativistic transport model calculations for nucleus nucleus collisions indicate, that the yield and spectra of kaons are very sensitive to the nuclear equation of state (EOS)[1]. Because of the relative weak K+-nucleon interaction (≈ 10 mb), the measurement of K+ mesons from heavy-ion collisions has thus been considered a promising way to probe not only the dense matter formed in the initial stage of the collision, when kaons are most likely to be produced [2, 3], but also the kaon properties in dense nuclear matter. Kaons might be subject to medium modifications. According to RBUU calculations of G. Q. Li and C. M. Ko [4] the maximum density reached in a Ni+Ni collision at 1.93 AGeV beam energy is about 3. Furthermore, the K+ mass grows less than 10%, the K mass is reduced by 50% in this density range. This change is driven by the kaon potential in nuclear matter which is density dependent and has its origin in explicit chiral symmetry breaking. Kaon directed sideward flow has been proposed as an additional and even more sensitive probe than the yield for determining the in medium kaon potential [5, 4]. In addition, the yield is influenced by multistep processes, the ratio K++ might be a sensitiv probe for resonance contributions to kaon production [6]. These probes (among others) remain to be very interesting as one proceeds to higher energies (AGS, SPS, RHIC, LHC) as new physics questions become relevant, for example verifying the phase transition of hadronic matter to the quark gluon plasma [7].


Transverse Momentum Impulse Approximation Nucleus Nucleus Collision Momentum Limit Inverse Slope Parameter 
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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    C. Hartnack et al., Nucl. Phys. 580 (1994) 643–677.CrossRefGoogle Scholar
  2. 2.
    J. Randrup and C. M. Ko, Nucl. Phys. A 343 (1980) 519, Nucl. Phys. A 411 (1981) 537.ADSCrossRefGoogle Scholar
  3. 3.
    J. Aichelin and C. M. Ko, Phys. Rev. Lett. 55 (1985) 2661.Google Scholar
  4. 4.
    G. Q. Li and C. M. Ko, Nucl. Phys. A 594 (1995) 460–482.ADSCrossRefGoogle Scholar
  5. 5.
    G. Q. Li, C. M. Ko and B. A. Li, Phys. Rev. Lett. 74 (1995) 235.ADSCrossRefGoogle Scholar
  6. 6.
    D. Miskowiec et al., Phys. Rev. Lett. 72 (1994) 3650.ADSCrossRefGoogle Scholar
  7. 7.
    J. W. Harris and B. Müller, The Search for the Quark-Gluon Plasma, hep-ph/9602235.Google Scholar
  8. 8.
    D. Best, Proceedings Bormio, 1995, p. 505.Google Scholar
  9. 9.
    J. L. Ritman, Proceedings Hirschegg, 1995, p. 340.Google Scholar
  10. 10.
    J. L. Ritman et al., Z. Phys. A 352 (1995) 355–357.ADSCrossRefGoogle Scholar
  11. 11.
    A. Gobbi et al., Nucl. Inst. Meth. 324 (1993) 156–176.ADSCrossRefGoogle Scholar
  12. 12.
    G. Q. Li, private communication.Google Scholar
  13. 13.
    A. Shor et al., Phys. Rev. Lett. 48 (1982) 1595, Phys. Rev. Lett. 63 (1989) 2192.Google Scholar
  14. 14.
    D. Best, GSI Scientific Report 1994, p. 84.Google Scholar
  15. 15.
    D. Best, Ph.D. thesis, Heidelberg, 1996.Google Scholar
  16. 16.
    S. Schnetzer et al., Phys. Rev. Lett. 49 (1982) 989, Phys. Rev. C 40 (1989) 640.ADSCrossRefGoogle Scholar
  17. 17.
    P. Siemens and J. O. Rasmussen, Phys. Rev. Lett. 42 (1979) 880.ADSCrossRefGoogle Scholar
  18. 18.
    P. Danielewicz and G. Odyniec, Phys. Lett. B 157 (1985) 146.ADSCrossRefGoogle Scholar
  19. 19.
    C. M. Ko, Proceedings Hirschegg, 1995, p. 192.Google Scholar
  20. 20.
    G. Q. Li, C. M. Ko, and G. E. Brown, Phys. Lett. B, submittedGoogle Scholar
  21. 21.
    G. E. Brown, C. M. Ko, and G. Q. Li, Nucl. Phys. A, submittedGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • Dieter Best
    • 1
  1. 1.FOPI collaborationGSIDarmstadtGermany

Personalised recommendations