Cold-fission yields at effective excitation energies.

The experimental cold-fission yields for the systein 2 3 ' ~ ( n , h , f ) are analyzed as function of the effective total excitation energy (TXE). The nuclear level density effect is taken into account at higher TXE, in order to benefit by the lower experimental data uncertainty as well as to avoid the quantitative account of the level densities close to fragment ground states. In this way the odd-even staggering which appears in the yields extrapolated at Zero excitatiori energy by using the level densities, vanishes. We conclude that the cold nuclear fragmentatioii theory including the dynamical model desciibes well the experimental data.