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Observation of Δ+→ pπ0 decay in heavy-ion collisions

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Abstract:

Proton-π0 coincidences have been measured at the beam energy of 180A MeV in the reaction Ar+Ca studied by TAPS at SIS/GSI. In the proton-π0 invariant mass spectrum we observe a significant excess of strength above the background obtained by event mixing. We attribute this signal to the strength distribution N Δ of the Δ baryonic resonance. No correlation is observed in the case of deuteron-π0 coincidences. Assuming isotropic emission of π0 and Δ+ from a midrapidity thermal source and isospin symmetry, we determined the global N Δ/N πratio of 0.79 ±0.30(stat) ±0.2(syst). This value indicates that most pions produced at subthreshold energy in heavy-ion reaction are mediated by the Δ-resonance.

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Authors and Affiliations

  1. Grand Accélérateur National d'Ions Lourds, CEA/DSM - CNRS/IN2P3, F-14076 Caen, France, , , , , , FR

    T. Matulewicz, L. Aphecetche, Y. Charbonnier, H. Delagrange, K.K. Gudima, G. Martınez, M. Płoszajczak, Y. Schutz & V.D. Toneev

  2. II Physikalisches Institut, Universität Gießen, D-35392 Gießen, Germany, , , , , , DE

    M. Appenheimer, V. Metag, R. Novotny, H. Ströher, J. Weiss, A.R. Wolf & M. Wolf

  3. Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany, , , , , , DE

    R. Averbeck, A. Döppenschmidt, R. Holzmann, F. Lefèvre, R.S. Simon, R. Stratmann & F. Wissmann

  4. Instituto de Fisica Corpuscular, E-46100 Burjasot, Spain, , , , , , ES

    J. Dıaz & A. Marın

  5. Kernfysisch Versneller Instituut, NL-9747 AA Groningen, The Netherlands, , , , , , NL

    M.J. van Goethem, M. Hoefman, H. Löhner, R.W. Ostendorf, R.H. Siemssen, P.H. Vogt & H.W. Wilschut

  6. Slovak Academy of Science, SK-84228 Bratislava, Slovak Republic, , , , , , SK

    S. Hlavač

  7. Nuclear Physics Institute, CZ-25068 Řež, Czech Republic, , , , , , CZ

    A. Kugler, P. Tlusty & V. Wagner

Authors
  1. T. Matulewicz
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  2. L. Aphecetche
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  3. Y. Charbonnier
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  4. H. Delagrange
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  5. K.K. Gudima
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  6. G. Martınez
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  7. M. Płoszajczak
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  8. Y. Schutz
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  9. V.D. Toneev
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  10. M. Appenheimer
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  11. R. Averbeck
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  12. J. Dıaz
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  13. A. Döppenschmidt
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  14. M.J. van Goethem
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  15. S. Hlavač
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  16. M. Hoefman
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  17. R. Holzmann
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  18. F. Lefèvre
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  19. A. Kugler
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  20. H. Löhner
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  21. A. Marın
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  22. V. Metag
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  23. R. Novotny
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  24. R.W. Ostendorf
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  25. R.H. Siemssen
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  26. R.S. Simon
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  27. R. Stratmann
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  28. H. Ströher
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  29. P. Tlusty
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  30. P.H. Vogt
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  31. V. Wagner
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  32. J. Weiss
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  33. H.W. Wilschut
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  34. F. Wissmann
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  35. A.R. Wolf
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  36. M. Wolf
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Additional information

Received: 7 April 2000 / Accepted: 29 August 2000

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Matulewicz, T., Aphecetche, L., Charbonnier, Y. et al. Observation of Δ+→ pπ0 decay in heavy-ion collisions. Eur Phys J A 9, 69–72 (2000). https://doi.org/10.1007/s100500070057

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  • DOI: https://doi.org/10.1007/s100500070057

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