Abstract
We present a precision experimental test of atomic many-body theory that is currently applied to the interpretation of recent parity-nonconservation experiments in atomic cesium. We report the first measurement of the $^{133}\mathrm{Cs}$ 6p $^{2}$${\mathit{P}}_{3/2}$ state lifetime using resonant diode-laser excitation of a fast atomic beam. The lifetime result of 30.55\ifmmode\pm\else\textpm\fi{}0.27 ns determines the absorption oscillator strength for the 6s $^{2}$${\mathit{S}}_{1/2}$--6p $^{2}$${\mathit{P}}_{3/2}$ transition in cesium to be 0.7133\ifmmode\pm\else\textpm\fi{}0.0064, and establishes the accuracy of recent relativistic many-body calculations of the dipole transition matrix element to 0.5%.
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