The mass and nuclear charge distributions of fission fragments from 2Z9Th(nth,f) have been measured at several kinetic energies with the mass spectrometer Lohengrin (ILLGrenoble). The average proton e-o effect, which reaches 41%, induces large oscillations in the parameters of the isotopic charge distribution. A comparison of the data from different fissile nuclei shows the importance of the last stage of the process for intrinsic excitations.

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