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Constraints on the time scale of nuclear breakup from thermal hard-photon emission

  • R. Ortega
  • D. d'Enterria
  • G. Martınez
  • D. Baiborodin
  • H. Delagrange
  • J. Dıaz
  • F. Fernández
  • H. Löhner
  • T. Matulewicz
  • R. W. Ostendorf
  • S. Schadmand
  • Y. Schutz
  • P. Tlusty
  • R. Turrisi
  • V. Wagner
  • H. W. Wilschut
  • N. Yahlali
Heavy Ion Physics

Abstract.

Measured hard-photon multiplicities from second-chance nucleon-nucleon collisions are used in combination with a kinetic thermal model to estimate the breakup times of excited nuclear systems produced in nucleus-nucleus reactions at intermediate energies. The obtained nuclear breakup time for the 129Xe + nat Sn reaction at 50 A MeV is Δτ ≈ 100-300 fm/c for all reaction centralities. The lifetime of the radiating sources produced in seven other different heavy-ion reactions studied by the TAPS experiment is consistent with Δτ ≈ 100 fm/c, such relatively long thermal photon emission times do not seemingly support the interpretation of nuclear breakup as due to a fast spinodal process for the heavy nuclear systems studied.

PACS.

21.65.+f Nuclear matter 25.70.-z Low and intermediate energy heavy-ion reactions 13.75.Cs Nucleon-nucleon interactions (including antinucleons, deuterons, etc.) 64.70.Dv Solid-liquid transitions 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2006

Authors and Affiliations

  • R. Ortega
    • 1
    • 2
  • D. d'Enterria
    • 1
    • 2
    • 3
  • G. Martınez
    • 2
    • 3
  • D. Baiborodin
    • 4
  • H. Delagrange
    • 2
    • 3
  • J. Dıaz
    • 5
  • F. Fernández
    • 1
  • H. Löhner
    • 6
  • T. Matulewicz
    • 7
  • R. W. Ostendorf
    • 6
  • S. Schadmand
    • 8
  • Y. Schutz
    • 2
    • 3
  • P. Tlusty
    • 4
  • R. Turrisi
    • 3
  • V. Wagner
    • 4
  • H. W. Wilschut
    • 6
  • N. Yahlali
    • 5
  1. 1.Grup de Fısica de les RadiacionsUniversitat Autònoma de BarcelonaCataloniaSpain
  2. 2.Subatech (Ecole des Mines, CNRS-IN2P3, Université de Nantes)NantesFrance
  3. 3.GANIL, Grand Accélérateur National d'Ions Lourds, IN2P3-CNRS, DSM-CEACaen Cedex 5France
  4. 4.Institute of Nuclear PhysicsRezCzech Republic
  5. 5.Institut de Fısica Corpuscular (CSIC, UV)ValènciaSpain
  6. 6.Kernfysisch Versneller InstituutGroningenThe Netherlands
  7. 7.Institut of Experimental PhysicsWarsaw UniversityWarsawPoland
  8. 8.Institut für KernphysikForschungszentrum JülichJülichGermany

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