Resumo
Partial half-lives of exotic radioactive decays of Th, Pa, U, Pu, and Cm parent isotopes by the emission of Ne, Mg, and Si isotopes is
re-evaluated in the framework of a semiempirical, one-parameter model based on the quantum tunneling mechanism through a potential
barrier where the Coulomb, centrifugal and overlapping contributions to the barrier are considered within the spherical nucleus
approximation. Updated values of nuclear mass and radius of the participating nuclides caused measured half-life data to be reproduced
with better reliability. The calculation model can be applied to other heavy-cluster decay cases of heavy and superheavy nuclei.
It is found a quite linear correlation of decimal log of half-life with the area between the potential barrier curve and the $Q$-value
for decay along the total barrier region.