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Beaulieu, L; Lefort, T; Kwiatkowski, K; de Souza, R T; Hsi, W; Pienkowski, L; Back, B; Bracken, D S; Breuer, H; Cornell, E; Gimeno-Nogues, F; Ginger, D S; Gushue, S; Korteling, R G; Laforest, R; Martin, E; Morley, K B; Ramakrishnan, E; Remsberg, L P; Rowland, D; Ruangma, A; Viola, V E; Wang, G; Winchester, E; Yennello, S J
Physical review letters, 06/2000, Letnik: 84, Številka: 26 Pt 1Journal Article
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 pi(-) and p+197Au 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.
