Abstract

Nuclear hyperfine mixing (NHM) is a distinctive effect through which nuclear properties and dynamics can be efficiently controlled. Traditionally, the scientific consensus has predominantly associated NHM with its pronounced impact on ^{229}Th, owing to the existence of its low-lying isomeric state. However, in the present study, by developing a general theory for NHM, we predict a surprisingly substantial NHM effect in boronlike ^{205}Pb ions (specifically, ^{205}Pb^{77+}), featuring a nuclear transition energy of 2.329keV. The radiative lifetime of the ^{205}Pb isomer is reduced by 4 orders of magnitude, from 15min to 32ms. This remarkable and unexpected NHM effect stems from a heretofore unexplored process: an opening of a magnetic dipole channel that is otherwise forbidden without NHM. ^{205}Pb ions now emerge as an attractive alternative candidate for experimental validation and investigation of the NHM effect.

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