Time Scale for Multifragmentation in Intermediate Energy Heavy-Ion Reactions
Fragment-fragment correlations are used to probe the spatial-temporal extent of the emitting source in central Ar36+197Au reactions at E/A=35, 50, 80, and 110 MeV. The experimental two particle correlations are compared both with the Koonin-Pratt two-body formalism as well as a three-body Coulomb trajectory calculation. The spatial-temporal extent of the emitting system decreases with increasing incident energy. Within the context of a three-body Coulomb trajectory model the mean fragment emission time rises sharply as a function of the assumed density of the system until ρ/ρ0≊0.3. If one assumes a fixed density, the extracted mean emission time decreases with increasing assumed charge of the emitting system. Assuming ρ/ρ0≊0.3 the mean emission time τ according to calculations using a three-body Coulomb trajectory model, is ≊115–135 fm/c at E/A=50 MeV and ≊75–100 fm/c at E/A=110 MeV. Comparisons with a generalized N-body Coulomb trajectory model demonstrate that the effect of interactions with other emitted particles is negligible. The prediction of a microcanonical model which includes pre-emission correlations between the fragments is compared to the measured correlation function at E/A=110 MeV.
Repository citation: Fox, D.; de Souza, R. T.; Glasmacher, T.; Phair, L.; Bowman, D. R.; Carlin, N.; Gelbke, C. K.; Gong, W. G.; Kim, Y. D.; Lisa, M. A.; Lynch, W. G.; Peaslee, Graham F.; Tsang, M. B.; and Zhu, F., "Time Scale for Multifragmentation in Intermediate Energy Heavy-Ion Reactions" (1994). Faculty Publications. Paper 1168.
Published in: Physical Review C, Volume 50, Issue 5, November 1, 1994, pages 2424-2437. Copyright © 1994 American Physical Society.