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Author Wang, G. ♦ Kwiatkowski, K. ♦ Bracken, D. S. ♦ Renshaw Foxford, E. ♦ Hsi, W. ♦ Morley, K. B. ♦ Viola, V. E. ♦ Yoder, N. R. ♦ Volant, C. ♦ Legrain, R. ♦ Pollacco, E. C. ♦ Korteling, R. G. ♦ Friedman, W. A. ♦ Botvina, A. ♦ Brzychczyk, J. ♦ Breuer, H.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ HELIUM 3 REACTIONS ♦ NUCLEAR FRAGMENTATION ♦ SILVER ♦ GOLD 197 ♦ STATISTICAL MODELS
Abstract To investigate the source size and time dependence of multifragmentation reactions, small- and large-angle relative velocity correlations between coincident complex fragments have been measured for the 1.8{endash}4.8 GeV {sup 3}He+{sup nat}Ag, {sup 197}Au systems. The results support an evolutionary scenario for the fragment emission process in which lighter IMFs (Z{approx_lt}6) are emitted from a hot, more dense source prior to breakup of an expanded residue. For the most highly excited residues, for which there is a significant yield of fragments with very soft energy spectra (E/A{le}3 MeV), comparisons with an {ital N}-body simulation suggest a breakup time of {tau}{approximately}50 fm/c for the expanded residue. Comparison of these data with both the evolutionary expanding emitting source model and the Copenhagen statistical multifragmentation model shows good agreement for heavier IMF{close_quote}s formed in the final breakup stage, but only the evolutionary model is successful in accounting for the lighter IMFs. thinsp {copyright} {ital 1999} {ital The American Physical Society}
ISSN 05562813
Educational Use Research
Learning Resource Type Article
Publisher Date 1999-07-01
Publisher Place United States
Journal Physical Review, C
Volume Number 60
Issue Number 1


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