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Phys. Rev. Lett. 92, 062701 (2004) [4 pages]

Isospin Diffusion and the Nuclear Symmetry Energy in Heavy Ion Reactions

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M. B. Tsang, T. X. Liu, L. Shi, P. Danielewicz, C. K. Gelbke, X. D. Liu, W. G. Lynch, W. P. Tan, G. Verde, A. Wagner, and H. S. Xu
National Superconducting Cyclotron Laboratory and Physics and Astronomy Department, Michigan State University, East Lansing, Michigan 48824, USA

W. A. Friedman
Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA

L. Beaulieu, B. Davin, R. T. de Souza, Y. Larochelle, T. Lefort, R. Yanez, and V. E. Viola, Jr.
Department of Chemistry and IUCF, Indiana University, Bloomington, Indiana 47405, USA

R. J. Charity and L. G. Sobotka
Department of Chemistry, Washington University, St. Louis, Missouri 63130, USA

Received 6 July 2003; published 10 February 2004

Using symmetric 112Sn+112Sn, 124Sn+124Sn collisions as references, we probe isospin diffusion in peripheral asymmetric 112Sn+124Sn, 124Sn+112Sn systems at an incident energy of E/A=50  MeV. Isoscaling analyses imply that the quasiprojectile and quasitarget in these collisions do not achieve isospin equilibrium, permitting an assessment of isospin transport rates. We find that comparisons between isospin sensitive experimental and theoretical observables, using suitably chosen scaled ratios, permit investigation of the density dependence of the asymmetry term of the nuclear equation of state.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.062701
DOI:
10.1103/PhysRevLett.92.062701
PACS:
25.70.Mn, 25.70.Pq
 
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