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Phys. Rev. Lett. 84, 5971–5974 (2000)

Signals for a Transition from Surface to Bulk Emission in Thermal Multifragmentation

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L. Beaulieu1, T. Lefort1, K. Kwiatkowski1,*, R. T. de Souza1, W.-c. Hsi1, L. Pienkowski2, B. Back3, D. S. Bracken1,†, H. Breuer4, E. Cornell1,‡, F. Gimeno-Nogues5, D. S. Ginger1,§, S. Gushue6, R. G. Korteling7, R. Laforest5,**, E. Martin5, K. B. Morley2, E. Ramakrishnan5, L. P. Remsberg6, D. Rowland5, A. Ruangma5, V. E. Viola1, G. Wang1,††, E. Winchester5, and S. J. Yennello5
1Department of Chemistry and IUCF, Indiana University, Bloomington, Indiana 47405
2Heavy Ion Laboratory, Warsaw University, Warsaw, Poland
3Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
4Department of Physics, University of Maryland, College Park, Maryland 20740
5Department of Chemistry & Cyclotron Laboratory, Texas A&M University, College Station, Texas 77843
6Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973
7Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada V5A IS6

Received 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

*Present address: Los Alamos National Laboratory, Los Alamos, New Mexico 87545.

Present address: Lawrence Berkeley Laboratory, Berkeley, California 94720.

§Present address: Cambridge University, Cambridge, United Kingdom.

**Present address: Barnes Hospital, Washington University, St. Louis, Missouri 63130.

††Present address: Epsilon, Inc., Dallas, Texas 75240.