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Background model for the NaI(Tl) crystals in COSINE-100

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arxiv 1804.05167 v3 pith:T7W4ZGNG submitted 2018-04-14 astro-ph.IM physics.ins-det

Background model for the NaI(Tl) crystals in COSINE-100

P. Adhikari , G. Adhikari , E. Barbosa de Souza , N. Carlin , S. Choi , W.Q. Choi , M. Djamal , A.C. Ezeribe
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C. Ha I.S. Hahn A.J.F. Hubbard E.J. Jeon J.H. Jo H.W. Joo W.G. Kang M. Kauer W.S. Kang B.H. Kim H. Kim H.J. Kim K.W. Kim M.C. Kim N.Y. Kim S.K. Kim Y.D. Kim Y.H. Kim V.A. Kudryavtsev H.S. Lee J. Lee J.Y. Lee M.H. Lee D.S. Leonard W.A. Lynch R.H. Maruyama F. Mouton S.L. Olsen H.K. Park H.S. Park J.S. Park K.S. Park W. Pettus H. Prihtiadi S. Ra C. Rott A. Scarff N.J.C. Spooner W.G. Thompson L. Yang S.H. Yong
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classification astro-ph.IM physics.ins-det
keywords backgroundcrystalsbackgroundscarlocosine-100crystalenergymodels
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The COSINE-100 dark matter search experiment is an array of NaI(Tl) crystal detectors located in the Yangyang Underground Laboratory (Y2L). To understand measured backgrounds in the NaI(Tl) crystals we have performed Monte Carlo simulations using the Geant4 toolkit and developed background models for each crystal that consider contributions from both internal and external sources, including cosmogenic nuclides. The background models are based on comparisons of measurement data with Monte Carlo simulations that are guided by a campaign of material assays and are used to evaluate backgrounds and identify their sources. The average background level for the six crystals (70 kg total mass) that are studied is 3.5 counts/day/keV/kg in the (2-6) keV energy interval. The dominant contributors in this energy region are found to be $^{210}$Pb and $^3$H.

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