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Phys. Rev. Lett. 85, 716–719 (2000)

Isospin Fractionation in Nuclear Multifragmentation

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H. S. Xu*, M. B. Tsang, T. X. Liu, X. D. Liu, W. G. Lynch, W. P. Tan, A. Vander Molen, G. Verde, A. Wagner†, H. F. Xi‡, and C. K. Gelbke
National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824

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

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

Received 25 October 1999; published in the issue dated 24 July 2000

Isotopic distributions for light particles and intermediate mass fragments have been measured for 112Sn+112Sn, 112Sn+124Sn, 124Sn+112Sn, and 124Sn+124Sn collisions at E/A = 50MeV. Isotope, isotone, and isobar yield ratios are utilized to estimate the isotopic composition of the gas phase at freeze-out. Analyses within the equilibrium limit imply that the gas phase is enriched in neutrons relative to the liquid phase represented by bound nuclei. These observations suggest that neutron diffusion is commensurate with or more rapid than fragment production.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.716
DOI:
10.1103/PhysRevLett.85.716
PACS:
25.70.Mn, 25.70.Pq

*On leave from the Institute of Modern Physics, Lanzhou, China.

†Present address: Institute für Kern- und Hadronenphysik, Forschungszentrum Rossendorf, D-01314 Dresden, Germany.

‡Present address: Benton Associates, Toronto, Canada.

§Present address: Laboratoire de Physique Nucléaire, Université Laval, Canada G1K 7P4.

**Present address: Department of Physics, Faculty of Science, University of Chile, Santiago, Chile.

 
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