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

Abstract : 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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Submitted on : Wednesday, February 15, 2017 - 3:44:08 PM
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E. Aprile, Jean-Pierre Cussonneau, S. Diglio, J. Masbou, K. Micheneau, et al.. Results from a Calibration of XENON100 Using a Source of Dissolved Radon-220. Physical Review D, American Physical Society, 2017, 95 (7), pp.072008. ⟨10.1103/PhysRevD.95.072008⟩. ⟨in2p3-01468567⟩

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