Abstract
Predictions for spontaneous and neutron-induced fission, alpha and beta decay have been made on the basis of potential-energy surfaces for Z ⩾ 90 nuclei on the neutron-rich side of the beta stability line. In spite of their considerable quantitive uncertainties, these predictions appear to negate the possibility of superheavy element synthesis via a one- or two-step r-process from super novae. In addition artificial superheavy element synthesis by two consecutive exploding nuclear devices appears improbable from these results. Neutron induced fission seems to be even more decisive than spontaneous fission for the early termination of the r-process.
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