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

• Main Authors: Albuquerque, I. F. M, Alexander, T, Ave, M, Back, H. O, Batignani, G, Bocci, V, Bonivento, W. M, Bussino, S, Cadeddu, M, Calaprice, F, Candela, A, Carlini, M, Carpinelli, M, Catalanotti, S, Cavalcante, P, Cavuoti, S, Chepurnov, A, Cicalo, C, Covone, G, D'Angelo, D, De Cecco, S, De Deo, M, De Rosa, G, Derbin, A. V, Devoto, A, Di Pietro, G, Dionisi, C, Downing, M, D'Urso, D, Edkins, E, Empl, A, Fomenko, K, Franco, D, Gabriele, F, Ghiano, C, Giagu, S, Giganti, C, Giovanetti, G. K, Granato, F, Grobov, A, Gromov, M, Guardincerri, Y, Gulino, M, Hackett, B. R, Herner, K, Hosseini, B, Hughes, D, Ippolito, V, Johnson, T. N, Kochanek, I, Koh, G, Korablev, D, Korga, G, Kubankin, A, Kuss, M, Lai, M, Li, X, Lissia, M, Longo, G, Machado, A. A, Mandarano, A, Mari, S. M, Martoff, C. J, Messina, A, Meyers, P. D, Musico, P, Oleinik, A, Orsini, M, Pagani, L, Pallavicini, M, Pelczar, K, Pelliccia, N, Picciau, E, Poudel, S. S, Qian, H, Razeti, M, Rossi, B, Sablone, D, Sands, W, Sanfilippo, S, Schlitzer, B, Semenov, D. A, Sheshukov, A, Skorokhvatov, M. D, Stanford, C, Stracka, S, Testera, G, Tonazzo, A, Trinchese, P, Unzhakov, E. V, Verducci, M, Vishneva, A, Vogelaar, R. B, Wada, M, Watson, A. W, Westerdale, S, Xiang, X, Xiao, X, Yang, C, Zhu, C
• Format: Journal Article
• Language: English
• Published: 28-10-2019
• Subjects: Physics - Instrumentation and Detectors; Physics - Instrumentation and Methods for Astrophysics
• DOI: 10.48550/arxiv.1907.09332

JINST 14 P11018 (2019) 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}}$.