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Results from a Calibration of XENON100 Using a Source of Dissolved Radon-220

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arxiv 1611.03585 v2 pith:OV55TTW6 submitted 2016-11-11 physics.ins-det

Results from a Calibration of XENON100 Using a Source of Dissolved Radon-220

The XENON Collaboration: E. Aprile , J. Aalbers , F. Agostini , M. Alfonsi , F.D. Amaro , M. Anthony , F. Arneodo , P. Barrow
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L. Baudis B. Bauermeister M.L. Benabderrahmane T. Berger P.A. Breur A. Brown E. Brown S. Bruenner G. Bruno R. Budnik L. Butikofer J. Calven J.M.R. Cardoso M. Cervantes D. Cichon D. Coderre A.P. Colijn J. Conrad J.P. Cussonneau M.P. Decowski P. dePerio P. DiGangi A. DiGiovanni S. Diglio E. Duchovni G. Eurin J. Fei A.D. Ferella A. Fieguth D. Franco W. Fulgione A. Gallo Rosso M. Galloway F. Gao M. Garbini C. Geis L.W. Goetzke L. Grandi Z. Greene C. Grignon C. Hasterok E. Hogenbirk R. Itay B. Kaminsky G. Kessler A. Kish H. Landsman R.F. Lang D. Lellouch L. Levinson M. LeCalloch Q. Lin S. Lindemann M. Lindner J.A.M. Lopes A. Manfredini I. Maris T. Marrodan Undagoitia J. Masbou F.V. Massoli D. Masson D. Mayani Y. Meng M. Messina K. Micheneau B. Miguez A. Molinario M. Murra J. Naganoma K. Ni U. Oberlack S.E.A. Orrigo P. Pakarha B. Pelssers R. Persiani F. Piastra J. Pienaar M.-C. Piro G.P lante N. Priel L. Rauch S. Reichard C. Reuter A. Rizzo S. Rosendahl N. Rupp R. Saldanha J.M.F. dosSantos G. Sartorelli M. Scheibelhut S. Schindler J. Schreiner M. Schumann L. Scotto Lavina M. Selvi P. Shagin E. Shockley M. Silva H. Simgen M.v. Sivers A. Stein D. Thers A. Tiseni G. Trinchero C. Tunnell N. Upole H. Wang Y. Wei C. Weinheimer J. Wulf J. Ye Y. Zhang
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classification physics.ins-det
keywords calibrationdetectorsourcexenon100activitybackgrounddarkmatter
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A Rn-220 source is deployed on the XENON100 dark matter detector in order to address the challenges in calibration of tonne-scale liquid noble element detectors. We show that the Pb-212 beta emission can be used for low-energy electronic recoil calibration in searches for dark matter. The isotope spreads throughout the entire active region of the detector, and its activity naturally decays below background level within a week after the source is closed. We find no increase in the activity of the troublesome Rn-222 background after calibration. Alpha emitters are also distributed throughout the detector and facilitate calibration of its response to Rn-222. Using the delayed coincidence of Rn-220/Po-216, we map for the first time the convective motion of particles in the XENON100 detector. Additionally, we make a competitive measurement of the half-life of Po-212, t = 293.9+-(1.0)+-(0.6) ns.

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