Orbital Electron Capture in the Heaviest Elements

$\mathrm{Log}\mathrm{ft}$ values have been calculated for 30 orbital electron capture isotopes in the heaviest elements ($Z=89-97\mathrm{}$). The average values of $log\mathrm{ft}$ products for negative beta particle transitions have been used to classify the electron capture transitions studied as to forbiddenness. A logarithmic plot of the electron capture partial half-life versus neutrino energy has been made for both the allowed and forbidden species. These diagrams can be used in the prediction of electron capture half-lives where one has some insight into the amount of decay energy available.