Abstract
An attempt is made to explain the irregular behaviour of the spontaneous fission half-lives. The influence of a single nucleon on the barrier height is calculated from the level scheme of Nilsson. It turns out that in many cases the single particle effects changes the barrier height quite considerably compared to the smooth change expected from the liquid drop model. The calculated changes are compared with the experimental data. They account quantitatively for the irregularities in the spontaneous fission rates. Finally, predictions of spontaneous fission half-lives are made for the heavier nuclei and the application of these predictions to some problems is discussed.
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