Abstract
A spontaneous-fission activity decaying with a half-life of 380 \ifmmode\pm\else\textpm\fi{} 60 \ensuremath{\mu}sec, identified as $^{258}\mathrm{Fm}$, was discovered among the recoil products from the bombardment of $^{257}\mathrm{Fm}$ with 12.5-MeV deuterons. The sharply decreasing spontaneous-fission lifetimes of nuclei with $N>152$ show a determined trend contrary to theoretical predictions. The exceedingly short half-life of $^{258}\mathrm{Fm}$ has led us to conclude that even-even nuclei in the immediate region beyond $N=158$ are becoming catastrophically unstable toward fission.
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