Source size and time dependence of multifragmentation induced by GeV {sup 3}He beams

Journal Article · Thu Jul 01 04:00:00 EDT 1999 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.60.014603· OSTI ID:365862

Wang, G; Kwiatkowski, K; Bracken, D S; Renshaw Foxford, E; Hsi, W; Morley, K B; Viola, V E; Yoder, N R ^[1]; Volant, C; Legrain, R; Pollacco, E C ^[2]; Korteling, R G ^[3]; Friedman, W A ^[4]; Botvina, A ^[5]; Brzychczyk, J ^[6]; Breuer, H ^[7]

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1. Departments of Chemistry and Physics and IUCF, Indiana University, Bloomington, Indiana 47405 (United States)
2. DAPNIA/SPhN, CEA/Saclay, F-91191 Gif-sur-Yvette (France)
3. Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, (Canada) V5A 156
4. Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States)
5. INFN and Department of Physics, University of Bologna, 40126 Bologna (Italy)
6. Institute of Physics, Jagiellonian University, Krakow (Poland)
7. Department of Physics, University of Maryland, College Park, Maryland 20740 (United States)

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}

• OSTI ID: 365862
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 1 Vol. 60; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
GOLD 197
HELIUM 3 REACTIONS
NUCLEAR FRAGMENTATION
SILVER
STATISTICAL MODELS