Experimental data from the reaction of an 8.0 GeV/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 - 5 MeV/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 - 5 MeV/nucleon.
|Number of pages||8|
|Journal||Physical Review C - Nuclear Physics|
|State||Published - Jun 1 2002|