Thermal excitation-energy deposition in 5-15 GeV/c hadron-induced reactions with 197Au. II. Relation between excitation energy and reaction variables

L. Beaulieu, T. Lefort, K. Kwiatkowski, W. C. Hsi, G. Wang, D. S. Bracken, E. Cornell, D. S. Ginger, K. B. Morley, V. E. Viola, F. Gimeno-Nogues, R. Laforest, E. Martin, E. Ramakrishnan, D. Rowland, A. Ruangma, E. Winchester, S. J. Yennello, R. G. Korteling, L. PienkowskiH. Breuer, B. Back, S. Gushue, L. P. Remsberg, M. J. Huang, W. G. Lynch, M. B. Tsang, H. Xi

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The relation between excitation energy and reaction observables has been examined for (6.0-14.6)-GeV/c protons, (5.0-9.2)-GeV π-, and 8.0-GeV/c antiprotons incident on a 197Au target. Relative to proton and π- beams, 8.0-GeV/c antiprotons are found to be the most effective projectile for depositing high excitation energies in the targetlike residue. For protons and π- the excitation-energy distributions are nearly identical and appear to be independent of beam momentum above 6-8 GeV/c. It is found that total measured charge, total thermal energy, and total charged-particle multiplicity scale most directly with excitation energy, whereas IMF multiplicity and total transverse energy exhibit large fluctuations. Correlations of the observed fragment multiplicity, charge, and kinetic-energy distributions with excitation energy indicate a transition in the reaction observables near E*/A≈4-6 MeV. These experimental signals are consistent with a multifragmentation mechanism that becomes the dominant deexcitation mode above in the range E*/A ∼4-6 MeV.

Original languageEnglish
Article number064604
Pages (from-to)646041-6460411
Number of pages5814371
JournalPhysical Review C - Nuclear Physics
Issue number6
StatePublished - Dec 2001

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