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The lifetimes of the $6d \ ^2D_{3/2}$ and $6d \ ^2D_{5/2}$ states in Fr areestimated to be 540(10) ns and 1704(32) ns respectively. They are determined bycalculating the radiative transition amplitudes of the allowed electric dipole(E1) and the forbidden electric quadrupole (E2) and magnetic dipole (M1)channels using the second order many-body perturbation theory (MBPT(2)) and thecoupled-cluster (CC) method at different levels of approximation in therelativistic framework. These long lifetimes and the large electric dipoleparity non conserving amplitudes of $7s \ ^2S_{1/2} \rightarrow 6d \^2D_{3/2,5/2}$ transitions strongly favour Fr as a leading candidate for themeasurement of parity nonconservation arising from the neutral current weakinteraction and the nuclear anapole moment.

Theoretical studies of the long lifetimes of the $6d \ ^2D_{3/2,5/2}$ states in Fr: Implications for parity nonconservation measurements