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Phys. Rev. C 64, 064604 (2001) [11 pages]

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

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L. Beaulieu et al.
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Received 19 December 2000; revised 1 June 2001; published 6 November 2001

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.


©2001 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevC.64.064604
DOI: 10.1103/PhysRevC.64.064604
PACS: 25.70.Pq, 25.40.-h, 25.43.+t, 25.80.Hp

* Present address: Départment de Physique, Université Laval, Laval, Quebec, Canada G1R 2J6.
† Present address: Laboratoire de Physique Corpusculaire de Caen, F-14050 Caen Cedex, France.
‡ Present address: Los Alamos National Laboratory, Los Alamos, NM 87545.
§ Present address: Rush Presbyterian, St. Luke Medical Center, Chicago, IL 60612.
** Present address: Epsilon, Inc., Dallas, TX 75240.
†† Present address: Lawrence Berkeley Laboratory, Berkeley, CA 94720.
‡‡ Present address: Department of Physics, Cambridge University, Cambridge, U.K.
Present address: Barnes Hospital, Washington University, St. Louis, MO 63130.
a Present address: Microcal Software, Inc., One Roundhouse Plaza, Northampton, MA 01060.
b Present address: Mallinckrodt Institute of Radiology, Washington University, St. Louis, MO 63110.

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