57829 20200221144212.0 doi 10.1140/epjc/s10052-016-4279-2 sideral 95595 ART-2016-95595 eng (orcid)0000-0002-7158-9794 Amaré, J. Universidad de Zaragoza Assessment of backgrounds of the ANAIS experiment for dark matter direct detection 2016 Access copy available to the general public Unrestricted A large effort has been carried out to charac- terize the background of sodium iodide crystals within the Annual modulation with NaI Scintillators (ANAIS) project. In this paper, the background models developed for three 12.5 kg NaI(Tl) scintillators produced by Alpha Spectra Inc. and operated at the Canfranc Underground Laboratory are presented together with an evaluation of the background prospects for the full experiment. Measured spectra from threshold to high energy in different conditions are well described by the models based on quantified activities. At the region of interest, crystal bulk contamination is the dominant background source. Contributions from 210 Pb, 40 K, 22 Na and 3 H are the most relevant. Those from 40 K and 22 Na could be efficiently suppressed thanks to anticoincidence operation in a crystals matrix or inside a liquid scintillator veto (LSV), while that from 210Pb has been reduced by improving crystal production methods and 3H production could be reduced by shielding against cosmic rays during production. Assuming the activities of the last characterized detector, for nine crys- tals with a total mass of 112.5 kg the expected background rate is 2.5 counts/(keV kg day) in the region from 1 to 4 keV, which could be reduced at 1.4 counts/(keV kg day) by using a LSV. info:eu-repo/grantAgreement/ES/MICINN/CPAN-CSD2007-00042 info:eu-repo/grantAgreement/ES/MINECO/Consolider-Ingenio2010-MULTI-DARK-CSD2009-00064 info:eu-repo/grantAgreement/ES/MINECO-FEDER/FPA2011-23749 info:eu-repo/grantAgreement/ES/MINECO-FEDER/FPA2014-55986-P info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 5.331 2016 PHYSICS, PARTICLES & FIELDS 4 / 29 = 0.138 2016 Q1 T1 1.653 2016 Physics and Astronomy (miscellaneous) 2016 Q1 Engineering (miscellaneous) 2016 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion (orcid)0000-0002-6948-5101 Cebrián, S. Universidad de Zaragoza (orcid)0000-0003-1190-7233 Cuesta, C. (orcid)0000-0002-9827-2332 García, E. Universidad de Zaragoza (orcid)0000-0002-9043-4691 Martínez, M. (orcid)0000-0001-7025-061X Oliván, M.A. Universidad de Zaragoza Ortigoza, Y. (orcid)0000-0001-8278-6032 Ortiz de Solorzano, A Universidad de Zaragoza (orcid)0000-0001-8732-8196 Puimedón, J. Universidad de Zaragoza (orcid)0000-0002-7552-1228 Sarsa, M.L. Universidad de Zaragoza (orcid)0000-0003-0228-7589 Villar, J.A. Universidad de Zaragoza (orcid)0000-0002-6519-4315 Villar, P. Universidad de Zaragoza 5007 520 Universidad de Zaragoza Dpto. Informát.Ingenie.Sistms. Área Ingen.Sistemas y Automát. 2004 X Universidad de Zaragoza Dpto. Física Teórica Área Técnica. Lab. y Talleres 2002 647 Universidad de Zaragoza Dpto. Física Aplicada Área Óptica 2004 390 Universidad de Zaragoza Dpto. Física Teórica Área Física Atóm.Molec.y Nucl. 76, 429 (2016), [15 pp.] EUR PHYS J C European Physical Journal C 1434-6044 2751335 http://zaguan.unizar.es/record/57829/files/texto_completo.pdf Versión publicada 11273 http://zaguan.unizar.es/record/57829/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:57829 articulos driver 2020-02-21-13:12:16 ARTICLE