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Measurements of the ion fraction and mobility of alpha and beta decay products in liquid xenon using EXO-200

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arxiv 1506.00317 v2 pith:YRXDMRNS submitted 2015-06-01 nucl-ex physics.ins-det

J.B. Albert , D.J. Auty , P.S. Barbeau , D. Beck , V. Belov , M. Breidenbach , T. Brunner , A. Burenkov
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G.F. Cao C. Chambers B. Cleveland M. Coon A. Craycraft T. Daniels M. Danilov S.J. Daugherty C.G. Davis J. Davis S. Delaquis A. Der Mesrobian-Kabakian R. DeVoe T. Didberidze A. Dolgolenko M.J. Dolinski M. Dunford W. Fairbank Jr. J. Farine W. Feldmeier P. Fierlinger D. Fudenberg R. Gornea K. Graham G. Gratta C. Hall M. Hughes M.J. Jewell X.S. Jiang A. Johnson T.N. Johnson S. Johnston A. Karelin L.J. Kaufman R. Killick T. Koffas S. Kravitz A. Kuchenkov K.S. Kumar D.S. Leonard C. Licciardi Y.H. Lin J. Ling R. MacLellan M.G. Marino B. Mong D. Moore R. Nelson K. O'Sullivan A. Odian I. Ostrovskiy A. Piepke A. Pocar C.Y. Prescott A. Robinson P.C. Rowson J.J. Russell A. Schubert D. Sinclair E. Smith V. Stekhanov M. Tarka T. Tolba R. Tsang K. Twelker J.-L. Vuilleumier A. Waite J. Walton T. Walton M. Weber L.J. Wen U. Wichoski J.D. Wright J. Wood L. Yang Y.-R. Yen O.Ya. Zeldovich
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classification nucl-exphysics.ins-det
keywords mathrmalphadecaysionsmobilitybetadriftfound
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abstract

Alpha decays in the EXO-200 detector are used to measure the fraction of charged $^{218}\mathrm{Po}$ and $^{214}\mathrm{Bi}$ daughters created from alpha and beta decays, respectively. $^{222}\mathrm{Rn}$ alpha decays in liquid xenon (LXe) are found to produce $^{218}\mathrm{Po}^{+}$ ions $50.3 \pm 3.0\%$ of the time, while the remainder of the $^{218}\mathrm{Po}$ atoms are neutral. The fraction of $^{214}\mathrm{Bi}^{+}$ from $^{214}\mathrm{Pb}$ beta decays in LXe is found to be $76.4 \pm 5.7\%$, inferred from the relative rates of $^{218}\mathrm{Po}$ and $^{214}\mathrm{Po}$ alpha decays in the LXe. The average velocity of $^{218}\mathrm{Po}$ ions is observed to decrease for longer drift times. Initially the ions have a mobility of $0.390 \pm 0.006~\mathrm{cm}^2/(\mathrm{kV}~\mathrm{s})$, and at long drift times the mobility is $0.219 \pm 0.004~\mathrm{cm}^2/(\mathrm{kV}~\mathrm{s})$. Time constants associated with the change in mobility during drift of the $^{218}\mathrm{Po}^{+}$ ions are found to be proportional to the electron lifetime in the LXe.

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