Breakup time scale studied in the 8 GeV/c pi(-)+Au reaction

L Pienkowski,K Kwiatkowski,T Lefort,WC Hsi,L Beaulieu,VE Viola,A Botvina,B Back,H Breuer,S Gushue,RG Korteling,R Laforest,E Martin,E Ramakrishnan,LP Remsberg,D Rowland,A Ruangma,E Winchester,SJ Yennello

AIP Conference Proceedings（2002）

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Abstract

Experimental data from the reaction of an 8.0 GeV/c pi(-) beam incident on a Au-197 target have been analyzed in order to investigate the breakup time scale for hot residues. Helium 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 seems unable to reproduce the data at excitation energies above 3 - 5 MeV/nucleon.

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