Breakup time scale studied in the 8 GeV/c pi(-)+Au-197 reaction
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abstract
Experimental data from the reaction of an [Formula Presented] beam incident on a [Formula Presented] 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 [Formula Presented] 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 [Formula Presented]. 2002 The American Physical Society.