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We report a measurement of the radiative lifetime of the 5s5p0. 25em{0ex}^3P₀^o metastable state in ^87Sr, which is coupled to the 5s^20. 25em{0ex}0. 2em{0ex}^1S₀ ground state via a hyperfine-induced electric dipole transition. The radiative lifetime is determined to be 151. 4 (48) s, in good agreement with theoretical results. Our approach relies on accurate measurements of laser intensity and free-space Rabi frequency, enabling lifetime measurements of any excited state and particularly suitable for long-lived states.
Lu et al. (Thu,) studied this question.