Post #2-Science-Oriented Observation I

A long-lived nuclear isomer can only exist if its change of nuclear spin in its decay is high, and if its decay energy is low. Gamma and beta decay are suppressed by 4-5 orders of magnitude with every increase in spin and with a constant decay energy. A normal gamma emission half-life of an excited state is on the order of 1e-12 seconds (one trillionth of a second), but this can lengthen dramatically with integer changes of nuclear spin of more than one.