Phys. Rev. Lett. 84, 5971–5974 (2000)Signals for a Transition from Surface to Bulk Emission in Thermal MultifragmentationReceived 1 November 1999; published in the issue dated 26 June 2000 Excitation-energy-gated two-fragment correlation functions have been studied between E*/A = (2–9)AMeV for equilibriumlike sources formed in 8–10GeV/c π- 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)AMeV, 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. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.5971
DOI:
10.1103/PhysRevLett.84.5971
PACS:
25.70.Pq, 21.65.+f, 25.40.-h, 25.80.Hp
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