Abstract
For nuclei in the actinide region we calculate within the cranking model the tensor of effective mass which has six independent components for three shape degrees of freedom — among them is the reflection asymmetry. With these mass parameters and the Strutinsky deformation energy the lifetimes for spontaneous fission are calculated in WKB approximation. The theory does not contain ad hoc parameters. Asymmetric fission is favoured; the most probable mass division (peak-to-peak ratio) agrees with the experimental data. The lifetimes for spontaneous fission from the ground state agree with the experimental data by order of magnitude. We also reproduce the experimental lifetime for isomer fission and obtain a slower de-excitation of the isomer through the first well. The results give support to the interpretation of the fission isomers as shape isomers and the validity of the adiabatic assumption.
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