  Spontaneous fission half-lives of actinide and super-heavy nuclei are
calculated, using the least-action integral, through the WKB tunneling
probability of the barrier that appears in the deformation landscape obtained
in the macroscopic-microscopic potential-energy surface. This
deformation-energy landscape is obtained using a Fourier shape parametrization
with 4 deformation parameters, taking into account the nuclear elongation,
left-right asymmetry, neck formation and non-axiality degrees of freedom. The
collective inertia tensor entering the WKB half-life expression is given
through the so-called irrotational flow approach, successfully used in nuclear
fission to reproduce observables that characterize the nuclear system in the
vicinity of the scission configurations, such as fragment mass or charge
distributions. For a comparisons, we have also used the so-called
phenomenological mass parameter depending only on the center-of-mass difference
of the forming fission fragments. Our approach is shown to be able to reproduce
empirical fission half-lives of all here considered nuclei to within 3 orders
of magnitude.
