Breakup time scale studied in the 8 GeV/cπ−+Aureaction

L Pienkowski, K Kwiatkowski,T Lefort,W C Hsi, L Beaulieu,V E Viola, A S Botvina,B B Back,H Breuer, S Gushue,R G Korteling,Richard Laforest,Eden R Martin, E Ramakrishnan,L P Remsberg,D Rowland,Ananya Ruangma,E M Winchester,S J Yennello

NUCLEAR PHYSICS IN THE 21st CENTURY:International Nuclear Physics Conference INPC 2001（2002）

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摘要

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 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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