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28 March 2024
 
  » arxiv » 1904.2112

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Measurement of the Gamma Ray Background in the Davis Cavern at the Sanford Underground Research Facility
D.S. Akerib ; C.W. Akerlof ; S.K. Alsum ; A. Angelides ; H.M. Araújo ; J.E. Armstrong ; M. Arthurs ; X. Bai ; J. Balajthy ; S. Balashov ; A. Baxter ; E.P. Bernard ; A. Biekert ; T.P. Biesiadzinski ; K.E. Boast ; B. Boxer ; P. Brás ; J.H. Buckley ; V.V. Bugaev ; S. Burdin ; J.K. Busenitz ; C. Carels ; D.L. Carlsmith ; M.C. Carmona-Benitez ; M. Cascella ; C. Chan ; A. Cole ; A. Cottle ; J.E. Cutter ; C.E. Dahl ; L. de Viveiros ; J.E.Y. Dobson ; E. Druszkiewicz ; T.K. Edberg ; A. Fan ; S. Fiorucci ; H. Flaecher ; T. Fruth ; R.J. Gaitskell ; J. Genovesi ; C. Ghag ; M.G.D. Gilchriese ; S. Gokhale ; M.G.D.van der Grinten ; C.R. Hall ; S. Hans ; J. Harrison ; S.J. Haselschwardt ; S.A. Hertel ; J.Y-K. Hor ; M. Horn ; D.Q. Huang ; C.M. Ignarra ; O. Jahangir ; W. Ji ; J. Johnson ; A.C. Kaboth ; K. Kamdin ; D. Khaitan ; A. Khazov ; W.T. Kim ; C.D. Kocher ; L. Korley ; E.V. Korolkova ; J. Kras ; H. Kraus ; S.W. Kravitz ; L. Kreczko ; B. Krikler ; V.A. Kudryavtsev ; E.A. Leason ; J. Lee ; D.S. Leonard ; K.T. Lesko ; C. Levy ; J. Li ; J. Liao ; F.-T. Liao ; J. Lin ; A. Lindote ; R. Linehan ; W.H. Lippincott ; R. Liu ; X. Liu ; C. Loniewski ; M.I. Lopes ; B. López Paredes ; W. Lorenzon ; S. Luitz ; J.M. Lyle ; P.A. Majewski ; A. Manalaysay ; L. Manenti ; R.L. Mannino ; N. Marangou ; M.F. Marzioni ; D.N. McKinsey ; J. McLaughlin ; Y. Meng ; E.H. Miller ; M.E. Monzani ; J.A. Morad ; E. Morrison ; B.J. Mount ; A.St.J. Murphy ; D. Naim ; A. Naylor ; C. Nedlik ; C. Nehrkorn ; H.N. Nelson ; F. Neves ; J. Nikoleyczik ; A. Nilima ; I. Olcina ; K.C. Oliver-Mallory ; S. Pal ; K.J. Palladino ; E.K. Pease ; B.P. Penning ; G. Pereira ; A. Piepke ; K. Pushkin ; J. Reichenbacher ; C.A. Rhyne ; Q. Riffard ; G.R.C. Rischbieter ; J.P. Rodrigues ; R. Rosero ; P. Rossiter ; G. Rutherford ; A.B.M.R. Sazzad ; R.W. Schnee ; M. Schubnell ; P.R. Scovell ; D. Seymour ; S. Shaw ; T.A. Shutt ; J.J. Silk ; C. Silva ; M. Solmaz ; V.N. Solovov ; P. Sorensen ; I. Stancu ; A. Stevens ; T.M. Stiegler ; K. Stifter ; M. Szydagis ; W.C. Taylor ; R. Taylor ; D. Temples ; P.A. Terman ; D.R. Tiedt ; M. Timalsina ; A Tomás ; M. Tripathi ; L. Tvrznikova ; U. Utku ; S. Uvarov ; A. Vacheret ; J.J. Wang ; J.R. Watson ; R.C. Webb ; R.G. White ; T.J. Whitis ; F.L.H. Wolfs ; D. Woodward ; J. Yin ;
Date 3 Apr 2019
AbstractDeep underground environments are ideal for low background searches due to the attenuation of cosmic rays by passage through the earth. However, they are affected by backgrounds from $gamma$-rays emitted by $^{40}$K and the $^{238}$U and $^{232}$Th decay chains in the surrounding rock. The LUX-ZEPLIN (LZ) experiment will search for dark matter particle interactions with a liquid xenon TPC located within the Davis campus at the Sanford Underground Research Facility, Lead, South Dakota, at the 4,850-foot level. In order to characterise the cavern background, in-situ $gamma$-ray measurements were taken with a sodium iodide detector in various locations and with lead shielding. The integral count rates (0--3300~keV) varied from 596~Hz to 1355~Hz for unshielded measurements, corresponding to a total flux in the cavern of $1.9pm0.4$~$gamma~$cm$^{-2}$s$^{-1}$. The resulting activity in the walls of the cavern can be characterised as $220pm60$~Bq/kg of $^{40}$K, $29pm15$~Bq/kg of $^{238}$U, and $13pm3$~Bq/kg of $^{232}$Th.
Source arXiv, 1904.2112
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