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With a help of the selfconsistent Hartree-Fock-Bogoliubov (HFB) approach withthe D1S effective Gogny interaction and the Generator Coordinate Method (GCM)we incorporate the transverse collective vibrations to the one-dimensionalmodel of the fission-barrier penetrability based on the traditional WKB method.The average fission barrier corresponding to the least-energy path in thetwo-dimensional potential energy landscape as function of quadrupole andoctupole degrees of freedom is modified by the influence of the transversecollective vibrations along the nuclear path to fission. The set of transversevibrational states built in the fission valley corresponding to a successivelyincreasing nuclear elongation produces the new energy barrier which is comparedwith the least-energy barrier. These collective states are given as theeigensolutions of the GCM purely vibrational Hamiltonian. In addition, theinfluence of the collective inertia on the fission properties is displayed, andit turns out to be the decisive condition for the possible transitions betweendifferent fission valleys.Comment: 12 pages, 5 figures, presented at XIII Workshop of Nuclear Physics,  Kazimierz Dolny, 2006 (Poland

MICROSCOPIC DETERMINATIONS OF FISSION BARRIERS (MEAN-FIELD AND BEYOND)