Title

Space-time Characteristics of Fragment Emission in the E/A=30 MeV 129Xe + natCu Reaction

Authors

D. R. Bowman, Atomic Energy of Canada, Ltd., Chalk River Laboratories
N. Colonna, INFN, Via Amendola 173, 70126 Bari, Italy
W. A. Friedman, Department of Physics, University of Wisconsin, Madison
L. Celano, INFN, Via Amendola 173, 70126 Bari, Italy
M. D'Agostino, Dipartimento di Fisica and INFN, Via Irnerio 46, 40126 Bologna, Italy
J. D. Dinius, NSCL, Michigan State University
A. Ferrero, Dipartimento di Fisica and INFN, Via Celoria 12, 20133 Milano, Italy
C. K. Gelbke, NSCL, Michigan State University
T. Glasmacher, NSCL, Michigan State University
D. O. Handzy, NSCL, Michigan State University
D. Horn, Atomic Energy of Canada, Ltd., Chalk River Laboratories
W. C. Hsi, NSCL, Michigan State University
M. Huang, NSCL, Michigan State University
I. Iori, Dipartimento di Fisica and INFN, Via Celoria 12, 20133 Milano, Italy
M. A. Lisa, NSCL, Michigan State University
W. G. Lynch, NSCL, Michigan State University
G. V. Margagliotti, Dipartimento di Fisica and INFN, Via A. Valerio 2, 34127 Trieste, Italy
P. M. Milazzo, Dipartimento di Fisica and INFN, Via Irnerio 46, 40126 Bologna, Italy
C. P. Montoya, NSCL, Michigan State University
A. Moroni, Dipartimento di Fisica and INFN, Via Celoria 12, 20133 Milano, Italy
Graham F. Peaslee, NSCL, Michigan State UniversityFollow
L. Phair, NSCL, Michigan State University,
F. Petruzzelli, Dipartimento di Fisica and INFN, Via Celoria 12, 20133 Milano, Italy
R. Scardaoni, Dipartimento di Fisica and INFN, Via Celoria 12, 20133 Milano, Italy
C. Schwarz, NSCL, Michigan State University
M. B. Tsang, NSCL, Michigan State University
C. Williams, NSCL, Michigan State University

Document Type

Article

Publication Date

8-1-1995

Abstract

Intermediate-mass-fragment emission has been studied in central E/A=30 MeV Xe129+natCu reactions. The measured fragment multiplicities, reduced-velocity correlation functions, and emission velocities have been compared with schematic three-body trajectory calculations and with three statistical models with input based upon a dynamical BNV code. The statistical models which include expansion either explicitly or implicitly are able to generate a sufficient number of fragments. The three-body trajectory calculations indicate a mean emission time of ≊200 fm/c, consistent with sequential decay. Dynamical expanding-emitting source calculations predict a similar time scale for fragment emission and give satisfactory agreement with the experimental correlation functions if the experimental angular distributions are incorporated into the model. The Berlin multifragmentation model gives good agreement with the experimental charge distributions, and, depending upon the choice of radius parameter, can provide agreement with either the correlation functions or the fragment emission velocities, but not with both simultaneously. Although an overall good agreement is obtained in the statistical model comparisons, even in the most violent collisions the angular distributions and fragment emission velocities are incompatible with completely equilibrated decay from a single source.

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