The advent of the double‐hump fission barrier that occurred about a decade ago was one of the great steps forward not only in fission but also in nuclear physics in general. This new development brought the two disciplines into much closer contact after years of independence. The double‐hump shape of the fission barrier (figure 1) provided the clue to a unified explanation of a number of experimental results. Among these are fission isomerism, the phenomenon whereby a heavy nucleus can exist in a relatively long‐lived excited state decaying by fission, and the appearance of several types of structure in the fission cross sections of many nuclei as a function of incident neutron energy.
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