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Phys. Rev. C 65, 064606 (2002) [8 pages]

Breakup time scale studied in the 8 GeV/cπ-+197Au reaction

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L. Pienkowski*
Heavy Ion Laboratory, Warsaw University, PL-02-093 Warszawa, Poland

K. Kwiatkowski, T. Lefort, W.-c. Hsi§, L. Beaulieu**, and V. E. Viola
Department of Chemistry and IUCF, Indiana University, Bloomington, Indiana 47405

A. Botvina
Institute for Nuclear Research, Russian Academy of Science, RU-117312 Moscow, Russia

R. G. Korteling
Department of Chemistry, Simon Fraser University, Burnaby, British Colombia, Canada V5A IS6

R. Laforest††, E. Martin, E. Ramakrishnan, D. Rowland††, A. Ruangma, E. Winchester, and S. J. Yennello
Department of Chemistry and Cyclotron Laboratory, Texas A&M University, College Station, Texas 77843

B. Back
Physics Division, Argonne National Laboratory, Argonne, Illionis 60439

H. Breuer
Department of Physics, University of Maryland, College Park, Maryland 20740

S. Gushue and L. P. Remsberg
Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973

Received 4 December 2001; published 23 May 2002

Experimental data from the reaction of an 8.0GeV/c π- beam incident on a 197Au target have been analyzed in order to investigate the breakup time scale for hot residues. Helium nuclei angular distributions and energy spectra supported by a momentum tensor analysis suggest that at large excitation energy, above 3-5MeV/nucleon, highly excited heavy fragments are separated promptly after the thermalization. A binary fission-like mechanism fits the experimental data at low excitation energies, but seems unable to reproduce the data at excitation energies above 3-5MeV/nucleon.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.65.064606
DOI:
10.1103/PhysRevC.65.064606
PACS:
25.70.Pq, 21.65.+f, 25.40.-h, 25.80.Hp

*Electronic address: pienkows@slcj.uw.edu.pl

Present address: Los Alamos National Laboratory, Los Alamos, NM 87545.

Present address: Laboratoire de Physique Corpusculaire de Caen, F-14050 Caen Cedex, France.

§Present address: Rush Presbyterian St. Luke Medical Center, Chicago, IL 60612.

**Present address: Département de Physique, Génie Physique et Optique Université Laval Québec, Canada G1K 7P4.

††Present address: Mallinckrodt Institute of Radiology, St. Louis, MO 63110.