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Breakup time scale studied in the 8 GeV/c pi- + 197Au reaction
L. Pienkowski, K. Kwiatkowski, T. Lefort1, 2, W. -C. Hsi, L. Beaulieu, A. Botvina, B. Back, H. Breuer, S. Gushue, R. G. Korteling, R. Laforest, E. Martin, E. Ramakrishnan, L. P. Remsberg, D. Rowland, A. Ruangma, V. E. Viola2, E. Winchester, S. J. Yennello

Experimental data from the reaction of an 8.0 GeV/c pi- beam incident on a 197Au target have been analyzed in order to investigate the integrated breakup time scale for hot residues. Alpha-particle energy spectra and particle angular distributions supported by a momentum tensor analysis suggest that at large excitation energy, above 3-5 MeV/nucleon, light-charged particles are emitted prior to or at the same time as the emission of the heavy fragments. Comparison with the SMM and GEMINI models is presented. A binary fission-like mechanism fits the experimental data at low excitation energies, but seems unable to reproduce the data at excitation energies above 3-5 MeV/nucleon.
1 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
2 :  IUCF - Indiana University Cyclotron Facility
Physique/Physique Nucléaire Expérimentale
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