Abstract
A semiempirical systematics of known fission isomer half-lives is proposed. For doubly odd and odd-mass nuclei there seems to be a pronounced correlation between the half-lives and the liquid-drop model fissility parameter with an additional modulation due to the variation of shell effects with neutron number. For even nuclei the observed isomeric half-lives are nearly constant irrespective of Z and A . A model based on a simplified double-humped fission barrier is discussed which may account for the general trend of fission isomeric half-lives of doubly odd and odd-mass nuclei. Parameters are given which reproduce the observed half-lives. Excitation energies and fission barrier heights are compared with the predictions of the model. Other explanations are considered for isomers in doubly even nuclei which do not follow the systematics.
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