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Measurement of the branching fractions and lifetime of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>5</mml:mn><mml:msub><mml:mi>D</mml:mi><mml:mrow><mml:mn>5</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>level of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow><mml:mi>Ba</mml:mi></mml:mrow><mml:mo>+</mml:mo></mml:msup></mml:math>
We present a measurement of the branching fractions for decay from the long-lived $5{D}_{5/2}$ level in ${^{138}\mathrm{Ba}}^{+}$. The branching fraction for decay into the $6{S}_{1/2}$ ground state was found to be $0.846{(25)}_{\mathrm{stat}}{(4)}_{\mathrm{sys}}$. We also report an improved measurement of the $5{D}_{5/2}$ lifetime, ${\ensuremath{\tau}}_{5{D}_{5/2}}=31.2(0.9)$ s. Together these measurements provide an experimental …