Time Scale for Multifragmentation in Intermediate Energy Heavy-Ion Reactions

D. Fox, Department of Chemistry and Indiana University Cyclotron Facility, Indiana University
R. T. de Souza, Department of Chemistry and Indiana University Cyclotron Facility, Indiana University
T. Glasmacher, National Superconducting Cyclotron Laboratory and Department of Physics Astronomy Michigan State University
L. Phair, National Superconducting Cyclotron Laboratory and Department of Physics Astronomy Michigan State University
D. R. Bowman, National Superconducting Cyclotron Laboratory and Department of Physics Astronomy Michigan State University
N. Carlin, National Superconducting Cyclotron Laboratory and Department of Physics Astronomy Michigan State University
C. K. Gelbke, National Superconducting Cyclotron Laboratory and Department of Physics Astronomy Michigan State University
W. G. Gong, National Superconducting Cyclotron Laboratory and Department of Physics Astronomy Michigan State University
Y. D. Kim, National Superconducting Cyclotron Laboratory and Department of Physics Astronomy Michigan State University
M. A. Lisa, National Superconducting Cyclotron Laboratory and Department of Physics Astronomy Michigan State University
W. G. Lynch, National Superconducting Cyclotron Laboratory and Department of Physics Astronomy Michigan State University
Graham F. Peaslee, National Superconducting Cyclotron Laboratory and Department of Physics Astronomy Michigan State UniversityFollow
M. B. Tsang, National Superconducting Cyclotron Laboratory and Department of Physics Astronomy Michigan State University
F. Zhu, National Superconducting Cyclotron Laboratory and Department of Physics Astronomy Michigan State University

Document Type

Article

Publication Date

11-1-1994

Publication Source

Physical Review C

Volume Number

50

Issue Number

5

First Page

2424

Last Page

2437

Publisher

American Physical Society

Abstract

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.

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