Ultra-Low Energy Calibration of LUX Detector using $^{127}$Xe Electron Capture
Creators: name: LUX Collaboration
name: Akerib, D. S.
name: Alsum, S.
name: Araújo, H. M.
name: Bai, X.
name: Bailey, A. J.
name: Balajthy, J.
name: Beltrame, P.
name: Bernard, E. P.
name: Bernstein, A.
name: Biesiadzinski, T. P.
name: Boulton, E. M.
name: Brás, P.
name: Byram, D.
name: Cahn, S. B.
name: Carmona-Benitez, M. C.
name: Chan, C.
name: Currie, A.
name: Cutter, J. E.
name: Davison, T. J. R.
name: Dobi, A.
name: Druszkiewicz, E.
name: Edwards, B. N.
name: Fallon, S. R.
name: Fan, A.
name: Fiorucci, S.
name: Gaitskell, R. J.
name: Genovesi, J.
name: Ghag, C.
name: Gilchriese, M. G. D.
name: Hall, C. R.
name: Hanhardt, M.
name: Haselschwardt, S. J.
name: Hertel, S. A.
name: Hogan, D. P.
name: Horn, M.
name: Huang, D. Q.
name: Ignarra, C. M.
name: Jacobsen, R. G.
name: Ji, W.
name: Kamdin, K.
name: Kazkaz, K.
name: Khaitan, D.
name: Knoche, R.
name: Larsen, N. A.
name: Lenardo, B. G.
name: Lesko, K. T.
name: Lindote, A.
name: Lopes, M. I.
name: Manalaysay, A.
name: Mannino, R. L.
name: Marzioni, M. F.
name: McKinsey, D. N.
name: Mei, D. M.
name: Mock, J.
name: Moongweluwan, M.
name: Morad, J. A.
name: Murphy, A. St. J.
name: Nehrkorn, C.
name: Nelson, H. N.
name: Neves, F.
name: O'Sullivan, K.
name: Oliver-Mallory, K. C.
name: Palladino, K. J.
name: Pease, E. K.
name: Rhyne, C.
name: Shaw, S.
name: Shutt, T. A.
name: Silva, C.
name: Solmaz, M.
name: Solovov, V. N.
name: Sorensen, P.
name: Sumner, T. J.
name: Szydagis, M.
name: Taylor, D. J.
name: Taylor, W. C.
name: Tennyson, B. P.
name: Terman, P. A.
name: Tiedt, D. R.
name: To, W. H.
name: Tripathi, M.
name: Tvrznikova, L.
name: Uvarov, S.
name: Velan, V.
name: Verbus, J. R.
name: Webb, R. C.
name: White, J. T.
name: Whitis, T. J.
name: Witherell, M. S.
name: Wolfs, F. L. H.
name: Xu, J.
name: Yazdani, K.
name: Young, S. K.
name: Zhang, C.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We report an absolute calibration of the ionization yields($\textit{Q$_y$})$ and fluctuations for electronic recoil events in liquid xenon at discrete energies between 186 eV and 33.2 keV. The average electric field applied across the liquid xenon target is 180 V/cm. The data are obtained using low energy $^{127}$Xe electron capture decay events from the 95.0-day first run from LUX (WS2013) in search of Weakly Interacting Massive Particles (WIMPs). The sequence of gamma-ray and X-ray cascades associated with $^{127}$I de-excitations produces clearly identified 2-vertex events in the LUX detector. We observe the K- (binding energy, 33.2 keV), L- (5.2 keV), M- (1.1 keV), and N- (186 eV) shell cascade events and verify that the relative ratio of observed events for each shell agrees with calculations. The N-shell cascade analysis includes single extracted electron (SE) events and represents the lowest-energy electronic recoil $\textit{in situ}$ measurements that have been explored in liquid xenon.
description: 10 pages, 10 figures, 2 tables