Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2000-04-11
Phys.Rev.Lett. 84 (2000) 5971-5974
Physics
Nuclear Physics
Nuclear Experiment
11 pages including 3 postscript figures (1 color)
Scientific paper
10.1103/PhysRevLett.84.5971
Excitation-energy-gated two-fragment correlation functions have been studied between 2 to 9A MeV of excitation energy for equilibrium-like sources formed in $\pi^-$ and p + $^{197}$Au reactions at beam momenta of 8,9.2 and 10.2 GeV/c. Comparison of the data to an N-body Coulomb-trajectory code shows a decrease of one order of magnitude in the fragment emission time in the excitation energy interval 2-5A MeV, followed by a nearly constant breakup time at higher excitation energy. The observed decrease in emission time is shown to be strongly correlated with the increase of the fragment emission probability, and the onset of thermally-induced radial expansion. This result is interpreted as evidence consistent with a transition from surface-dominated to bulk emission expected for spinodal decomposition.
Back Birger B.
Beaulieu L.
Bracken D. S.
Breuer Herbert
Cornell Eric
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