[en] V.M. Strutinsky's semi-classical method is the most precise to determine the energy of the different states along the fission way. The double-humped fission barrier explains fission isomerism. V.M. Strutinsky's barrier explains the ''intermediate structure'' observed in the cross section under the threshold; it provides also the observed effect of ''vibrational resonances'' with an interpretation. Taking an asymmetry parameter in consideration, a triple-humped fission barrier seems to be essential now for the light actinides. There is still a microscopic fission barrier to be explained

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[en] The most important facts, developments and unsolved problems of the International Symposium on Physics and Chemistry of Fission in Juelich, 1979, are summarized in this paper

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[en] A simplified quantum-mechanical treatment is presented for describing the dynamics of nuclear fission. The collective Hamiltonian is assumed to be two dimensional and the reduced mass is allowed to vary with the co-ordinates. The corresponding scattering problem can be cast into a system of coupled one-dimensional equations after a proper transformation of the co-ordinates. Such system of coupled equations can be decoupled by replacing the coupling matrix elements by a non-local interaction, which can be rendered local after employing the effective mass approximation. As a consequence this gives rise to an effective potential barrier which, in general, involves intermediate potential wells that can accommodate quasi-bound states. Parameterization of such multi-humped barrier is made in terms of Wood-Saxon functions, which not only satisfy the physical requirements, but also amenable to analytic solutions. The corresponding penetrability factor shows resonance structure which is superimposed to a slowly varying rounded step function. The resonance indicate the quasibound states that are set up in the intermediate wells, and their widths are inversely proportional to the half life times of the parent nucleus that is trapped in such resonant states

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[en] A method is suggested for the separation of the overlapping proton and neutron closed-shell effects on experimental fission barriers at Z = 82 and N = 126. (author)

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[en] In this work, it is made an analysis of the beam energy spectrure of the linear electron accelerator (28 MeV) of the Centro Brasileiro de Pesquisas Fisicas. Methods and precision of measurements are discussed. Present and future work are also presented and discussed. (A.C.A.S.)

No abstract available