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Isotope yields from central Sn collisions, dynamical emission?

Isotopic yields for light particles and intermediate mass fragments have been measured for 112 Sn+ 112 Sn, 112 Sn+ 124 Sn, 124 Sn+ 112 Sn and 124 Sn+ 124 Sn central collisions at E/A=50 MeV and compared with predictions of stochastic mean ﬁeld calculations. These calculations predict a sensitivity of the isotopic distributions to the density dependence of the asymmetry term of the nuclear equation of state. However, the secondary decay of the excited fragments modiﬁes signiﬁcantly the primary isotopic distributions and these modiﬁcations are rather sensitive to theoretical uncertainties in the excitation energies of the hot fragments. The predicted ﬁnal isotope distributions are narrower than the experimental data and the sensitivity of the predicted yields to the density dependence of the asymmetry term is reduced.