DAPNIA-05-224 |
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Multifragmentation of very heavy nuclear systems (III): fragment velocity correlations and event topology at freezeÂout. |
G. Tabacaru, M.F. Rivet, B. Borderie, M. Parlog, B. Bouriquet, A. Chbihi, J.D. Frankland, J.P. Wieleczko, E. Bonnet, R. Bougault, R. Dayras, E. Galichet, D. Guinet, P. Lautesse, N. Le Neindre, O. Lopez, L. Manduci, L. Nalpas, P. Pawlowski, E. Rosato, R. Roy, S. Salou, B. Tamain, E. Vient, M. Vigilante and C. Volant |
Kinetic energy spectra and fragment velocity correlations, simulated by means of stochastic meanfield calculations, are successfully confronted with experimental data for single multifragmenting sources prepared at the same excitation energy per nucleon in 32 AMeV 129Xe+ natSn and 36 AMeV 155Gd+ natU central collisions. Relying thus on simulations, average freezeout times of 200-240 fm/c are obtained. The corresponding spatial distributions of fragments are more compact for the lighter system (~34V0 vs ~8V0 ). |