The energy and lifetime of the metastable 3 D 2 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 1 P 1 – 1 S 0 and 3 D 2 – 1 S 0 transitions, and the hyperfine structures of the 1 P 1 and 3 D 2 states of radium. The calculations yield the 3 D 2 lifetime τ = 4 s.
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Biero et al. (2004) studied this question.
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