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18 April 2024

» pubmed » pmid10991101

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Signals for a transition from surface to bulk emission in thermal multifragmentation
L Beaulieu ; T Lefort ; K Kwiatkowski ; R T de Souza ; W 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 Rowl ; A Ruangma ; V E Viola ; G Wang ; E Winchester ; S J Yennello ;
Date:	26 Jun 2000
Journal:	Phys Rev Lett, 84 (26 Pt 1), 5971-4
Abstract:	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.
Source:	PubMed, pmid10991101
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