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arXiv · 1907.09332

Measurement of the ion fraction and mobility of $^{218}$Po produced in $^{222}$Rn decays in liquid argon

P. Agnes·I. F. M. Albuquerque·T. Alexander·A. K. Alton·M. Ave·H. O. Back·G. Batignani·K. Biery·V. Bocci·G. Bonfini·W. M. Bonivento·B. Bottino·S. Bussino·M. Cadeddu·M. Cadoni·F. Calaprice·A. Caminata·N. Canci·A. Candela·M. Caravati·M. Cariello·M. Carlini·M. Carpinelli·S. Catalanotti·V. Cataudella·P. Cavalcante·S. Cavuoti·A. Chepurnov·C. Cicalo·A. G. Cocco·G. Covone·D. D'Angelo·S. Davini·A. De Candia·S. De Cecco·M. De Deo·G. De Filippis·G. De Rosa·A. V. Derbin·A. Devoto·F. Di Eusanio·M. D'Incecco·G. Di Pietro·C. Dionisi·M. Downing·D. D'Urso·E. Edkins·A. Empl·G. Fiorillo·K. Fomenko·D. Franco·F. Gabriele·C. Galbiati·C. Ghiano·S. Giagu·C. Giganti·G. K. Giovanetti·O. Gorchakov·A. M. Goretti·F. Granato·A. Grobov·M. Gromov·M. Guan·Y. Guardincerri·M. Gulino·B. R. Hackett·K. Herner·B. Hosseini·D. Hughes·P. Humble·E. V. Hungerford·Al. Ianni·An. Ianni·V. Ippolito·T. N. Johnson·K. Keeter·C. L. Kendziora·I. Kochanek·G. Koh·D. Korablev·G. Korga·A. Kubankin·M. Kuss·M. La Commara·M. Lai·X. Li·M. Lissia·G. Longo·A. A. Machado·I. N. Machulin·A. Mandarano·L. Mapelli·S. M. Mari·J. Maricic·C. J. Martoff·A. Messina·P. D. Meyers·R. Milincic·A. Monte·M. Morrocchi
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Abstract

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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P. Agnes, I. F. M. Albuquerque, T. Alexander, A. K. Alton, M. Ave, H. O. Back, G. Batignani, K. Biery, V. Bocci, G. Bonfini, W. M. Bonivento, B. Bottino, S. Bussino, M. Cadeddu, M. Cadoni, F. Calaprice, A. Caminata, N. Canci, A. Candela, M. Caravati, M. Cariello, M. Carlini, M. Carpinelli, S. Catalanotti, V. Cataudella, P. Cavalcante, S. Cavuoti, A. Chepurnov, C. Cicalo, A. G. Cocco, G. Covone, D. D'Angelo, S. Davini, A. De Candia, S. De Cecco, M. De Deo, G. De Filippis, G. De Rosa, A. V. Derbin, A. Devoto, F. Di Eusanio, M. D'Incecco, G. Di Pietro, C. Dionisi, M. Downing, D. D'Urso, E. Edkins, A. Empl, G. Fiorillo, K. Fomenko, D. Franco, F. Gabriele, C. Galbiati, C. Ghiano, S. Giagu, C. Giganti, G. K. Giovanetti, O. Gorchakov, A. M. Goretti, F. Granato, A. Grobov, M. Gromov, M. Guan, Y. Guardincerri, M. Gulino, B. R. Hackett, K. Herner, B. Hosseini, D. Hughes, P. Humble, E. V. Hungerford, Al. Ianni, An. Ianni, V. Ippolito, T. N. Johnson, K. Keeter, C. L. Kendziora, I. Kochanek, G. Koh, D. Korablev, G. Korga, A. Kubankin, M. Kuss, M. La Commara, M. Lai, X. Li, M. Lissia, G. Longo, A. A. Machado, I. N. Machulin, A. Mandarano, L. Mapelli, S. M. Mari, J. Maricic, C. J. Martoff, A. Messina, P. D. Meyers, R. Milincic, A. Monte, M. Morrocchi. 2019-07-22. Measurement of the ion fraction and mobility of $^{218}$Po produced in $^{222}$Rn decays in liquid argon. https://doi.org/10.1088/1748-0221/14/11/p11018

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