Abstract
The decay of a very long-lived state, such as the famous $J={9}^{\ensuremath{-}}$ isomeric state in $^{180}\mathrm{Ta}$, when irradiated by $\ensuremath{\gamma}$ rays or subjected to Coulomb excitation, can be accelerated by the existence of a doorway state for mixing an excited state of the isomeric band with the states of other bands decaying to the ground state. We describe the mechanism of such a decay similar to the chaos-assisted tunneling.
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