79690 20220120225832.0 doi 10.1140/epjc/s10052-019-6911-4 sideral 112464 ART-2019-112464 eng Amaré, J. Universidad de Zaragoza (orcid)0000-0002-7158-9794 Analysis of backgrounds for the ANAIS-112 dark matter experiment 2019 Access copy available to the general public Unrestricted The ANAIS (Annual modulation with NaI(Tl) Scintillators) experiment aims at the confirmation or refutation of the DAMA/LIBRA positive annual modulation signal in the low energy detection rate, using the same target and technique, at the Canfranc Underground Laboratory (LSC) in Spain. ANAIS-112, consisting of nine 12.5 kg NaI(Tl) modules produced by Alpha Spectra Inc. in a 3 × 3 matrix configuration, is taking data smoothly in “dark matter search” mode since August, 2017, after a commissioning phase and operation of the first detectors during the last years in various set-ups. A large effort has been carried out within ANAIS to characterize the background of sodium iodide detectors, before unblinding the data and performing the first annual modulation analysis. Here, the background models developed for all the nine ANAIS-112 detectors are presented. Measured spectra from threshold to high energy in different conditions are well described by the models based on quantified activities independently estimated following several approaches. In the region from 1 to 6keVee the measured, efficiency corrected background level is 3.58±0.02keV-1kg-1day-1; NaI crystal bulk contamination is the dominant background source being 210 Pb , 40 K , 22 Na and 3 H contributions the most relevant ones. This background level, added to the achieved 1keVee analysis threshold (thanks to the outstanding light collection and robust filtering procedures developed), allow ANAIS-112 to be sensitive to the modulation amplitude measured by DAMA/LIBRA, and able to explore at three sigma level in 5 years the WIMP parameter region singled out by this experiment. © 2019, The Author(s). info:eu-repo/grantAgreement/ES/MINECO/Consolider-Ingenio2010-MULTI-DARK-CSD2009-00064 info:eu-repo/grantAgreement/ES/MINECO/Consolider-Ingenio2010-MULTI-DARK-CPANCSD2007-00042 info:eu-repo/grantAgreement/ES/MINECO-FEDER/FPA2014-55986-P info:eu-repo/grantAgreement/ES/MINECO-FEDER/FPA2017-83133-P info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 4.389 2019 PHYSICS, PARTICLES & FIELDS 7 / 29 = 0.241 2019 Q1 T1 1.763 2019 Physics and Astronomy (miscellaneous) 2019 Q1 Engineering (miscellaneous) 2019 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Cebrián, S. Universidad de Zaragoza (orcid)0000-0002-6948-5101 Coarasa, I. Universidad de Zaragoza (orcid)0000-0002-8100-1368 Cuesta, C. (orcid)0000-0003-1190-7233 García, E. Universidad de Zaragoza (orcid)0000-0002-9827-2332 Martínez, M. Universidad de Zaragoza (orcid)0000-0002-9043-4691 Oliván, M.A. Universidad de Zaragoza (orcid)0000-0001-7025-061X Ortigoza, Y. (orcid)0000-0002-2793-7544 Ortiz de Solórzano, A. Universidad de Zaragoza (orcid)0000-0001-8278-6032 Puimedón, J. Universidad de Zaragoza (orcid)0000-0001-8732-8196 Salinas, A. Universidad de Zaragoza (orcid)0000-0001-9508-8567 Sarsa, M.L. Universidad de Zaragoza (orcid)0000-0002-7552-1228 Villar, J.A. (orcid)0000-0003-0228-7589 Villar, P. Universidad de Zaragoza (orcid)0000-0002-6519-4315 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 5008 800 Universidad de Zaragoza Dpto. Ingeniería Electrón.Com. Área Teoría Señal y Comunicac. 2002 647 Universidad de Zaragoza Dpto. Física Aplicada Área Óptica 2004 390 Universidad de Zaragoza Dpto. Física Teórica Área Física Atóm.Molec.y Nucl. 79 (2019), 412 [22 pp.] Eur. phys. j., C European Physical Journal C 1434-6044 1196722 http://zaguan.unizar.es/record/79690/files/texto_completo.pdf Versión publicada 111040 http://zaguan.unizar.es/record/79690/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:79690 articulos driver 2022-01-20-22:55:07 ARTICLE