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Measurement of the ion fraction and mobility of ²¹⁸Po produced in ²²²Rn decays in liquid argon
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arxiv 1907.09332 v2 pith:JMMOIRK4 submitted 2019-07-22 astro-ph.IM physics.ins-det
Measurement of the ion fraction and mobility of ²¹⁸Po produced in ²²²Rn decays in liquid argon
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We report measurements of the charged daughter fraction of $^{218}$Po as a result of the $^{222}$Rn alpha decay, and the mobility of $^{218}$Po$^+$ ions, using radon-polonium coincidences from the $^{238}$U chain identified in 532 live-days of DarkSide-50 WIMP-search data. The fraction of $^{218}$Po that is charged is found to be 0.37$\pm$0.03 and the mobility of $^{218}$Po$^+$ is (8.6$\pm$0.1)$\times$10$^{-4}$$\frac{\text{cm}^2}{\text{Vs}}$.
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