Signals for a transition from surface to bulk emission in thermal multifragmentation

L. Beaulieu, T. Lefort, K. Kwiatkowski, R. T. de Souza, W. c. Hsi, L. Pienkowski, B. Back, D. S. Bracken, H. Breuer, E. Cornell, F. Gimeno-Nogues, D. S. Ginger, S. Gushue, R. G. Korteling, R. Laforest, E. Martin, K. B. Morley, E. Ramakrishnan, L. P. Remsberg, D. RowlandA. Ruangma, V. E. Viola, G. Wang, E. Winchester, S. J. Yennello

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101 Scopus citations


Excitation-energy-gated two-fragment correlation functions have been studied between E*/A = (2-9) A MeV for equilibriumlike sources formed in 8–10 GeV/c π and p+197 Au reactions. Comparison with an N-body Coulomb-trajectory code shows an order of magnitude decrease in the fragment emission time in the interval E*/A =(2-5) A MeV, followed by a nearly constant breakup time at higher excitation energy. The decrease in emission time is strongly correlated with the onset of multifragmentation and thermally induced radial expansion, consistent with a transition from surface-dominated to bulk emission expected for spinodal decomposition.

Original languageEnglish
Pages (from-to)5971-5974
Number of pages4
JournalPhysical Review Letters
Issue number26
StatePublished - 2000


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