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Phys. Rev. C 62, 031604(R) (2000) [5 pages]

Thermal expansion effects in the 8 GeV/c π-+197Au reaction

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T. Lefort1, L. Beaulieu1, A. Botvina2, D. Durand3, K. Kwiatkowski1,*, W.-c. Hsi1,†, L. Pienkowski4, H. Breuer5, R. G. Korteling6, R. Laforest7,‡, E. Martin7, E. Ramakrishnan7, D. Rowland7, A. Ruangma7, V. E. Viola1, E. Winchester7, and S. J. Yennello7
1Department of Chemistry and IUCF, Indiana University, Bloomington, Indiana 47405
2Institute for Nuclear Research, Russian Academy of Science, 117312 Moscow, Russia
3LPC de Caen, 6 Boulevard Marechal Juin, F-14050 Caen, France
4Heavy Ion Laboratory, Warsaw University, PL-02 097 Warsaw, Poland
5Department of Physics, University of Maryland, College Park, Maryland 20742
6Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
7Department of Chemistry and Cyclotron Laboratory, Texas A&M University, College Station, Texas 77843

Received 28 June 2000; published 21 August 2000

Fragment kinetic energy spectra for reactions induced by 8.0 GeV/cπ- beams on a 197Au target have been analyzed. The average fragment kinetic energies are observed to increase systematically with fragment charge but are nearly independent of excitation energy. Near E*/A=5 MeV, the data are well accounted for by two statistical multifragmentation models, SMM and SIMON-explosion. However, at higher excitation energies, a small amount of extra energy, proportional to the fragment mass, is required in the models in order to match the experimental fragment’s kinetic energies. This extra expansion energy is small relative to the radial expansion observed in heavy-ion-induced reactions, consistent with the interpretation that the latter expansion may be driven primarily by collective dynamical effects that are not present in light-ion-induced collisions.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.62.031604
DOI:
10.1103/PhysRevC.62.031604
PACS:
25.70.Pq, 21.65.+f, 25.40.-h, 25.80.Hp

*Present address: Physics Division, Los Alamos National Laboratory, Los Alamos, NM 87545.

†Present address: 7745 Lake Street, Morton Grove, IL 60053.

‡Present address: Washington University Medical School, 510 Kingshighway, St. Louis, MO 63110.

 
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