Breakup time scale studied in the 8 GeV/c pi- + 197Au reaction
/ Authors
L. Pieńkowski, K. Kwiatkowski, T. Lefort, W. Hsi, L. Beaulieu, A. Botvina, B. Back, H. Breuer, S. Gushue, R. Korteling
and 9 more authors
R. Laforest, E. Martin, E. Ramakrishnan, L. Remsberg, D. Rowland, A. Ruangma, V. Viola, E. Winchester, S. Yennello
/ Abstract
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.
Journal: arXiv: Nuclear Experiment