Yet More Complexity in Fission: Barriers for Nuclei withN=150−154

Fission probabilities are presented for a series of Pu, Cm, and Cf nuclei with neutron numbers, $N$, in the range of 150-154. Results show that the fission thresholds are slowly varing with $N$ and $Z$ for $N=150-153\mathrm{}$ but there is a strong decrease in the threshold for $N=154\mathrm{}$. For ${}_{}{}^{252}{}_{}{}^{}\mathrm{Cf}$ ($N=154\mathrm{}$) the results indicate broad, strong resonances at ∼ 5.0 and 5.4 MeV and suggest the breakup of the first axially asymmetric saddle into two barriers with large $\hslash \omega$.