Investigating the isotopic effects in nuclear fragmentation

Modifications for symmetry energy coefficients of nuclear matter at freeze-out density are investigated on the basis of the Statistical Multifragmentation Model (SMM). In order to compare our predictions with MSU experimental data we consider the fragmentation of the projectiles 124Sn and 112Sn which were also used for the MSU experiments, and of the projectiles 124Sn, 124La and 107Sn used for the ALADIN experiments. Comparing our results with the experimental data, it is confirmed that a significant reduction of the symmetry term coefficient is found necessary to reproduce the mean hNi=Z values of light fragments.