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Physical Review Letters 75 (1999) 716-719
Isospin Fractionation in Nuclear Multifragmentation
H. S. Xu, M. B. Tsang, T. X. Liu, X. D. Liu, W. G. Lynch, W. P. Tan, G. Verde, A. VanderMolen, A. Wagnera, H. F. Xib, C. K. Gelbke, L. Beaulieu, B. Davin, Y. Larochellec, T. Lefort1, 2, R. T. de Souza, R. Yanez, V. Viola2, R. J. Charity, L. G. Sobotka

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=50 MeV. Isotope, isotone and isobar yield ratios are utilized to obtain an estimate of the isotopic composition of the gas phase, i.e., the relative abundance of free neutrons and protons at breakup. Within the context of equilibrium calculations, these analyses indicate that the gas phase is enriched in neutrons relative to the liquid phase represented by bound nuclei.
1 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
2 :  IUCF - Indiana University Cyclotron Facility
Physique/Physique Nucléaire Expérimentale
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