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Lifetime and hyperfine structure of the 3D2 state of radium

The energy and lifetime of the metastable 3D2 level of radium play an important role in planned experimental investigations of parity and time reversal violation. The multiconfiguration Dirac–Hartree–Fock (MCDHF) model was employed to compute the oscillator strengths of the 1P1–1S0 and 3D2–1S0 transitions, and the hyperfine structures of the 1P1 and 3D2 states of radium. The calculations yield the 3D2 lifetime τ = 4 s.