85437 20250722154011.0 doi 10.1140/epjc/s10052-019-7282-6 sideral 114162 ART-2019-114162 eng Castel, J. Universidad de Zaragoza (orcid)0000-0003-3532-7540 Background assessment for the TREX dark matter experiment 2019 Access copy available to the general public Unrestricted TREX-DM is conceived to look for low-mass Weakly Interacting Massive Particles (WIMPs) using a gas Time Projection Chamber equipped with Micromegas readout planes at the Canfranc Underground Laboratory. The detector can hold in the active volume 20l\{-69pt}begin{document}$$\sim 20l$$\end{document} of pressurized gas up to 10 bar, corresponding to 0.30 kg of Ar or 0.16 kg of Ne. The Micromegas are read with a self-triggered acquisition, being thresholds below 0.4 keV (electron equivalent) at reach. A low background level in the lowest energy region is another essential requirement. To assess the expected background, all the relevant sources have been considered, including the measured fluxes of gamma radiation, muons and neutrons at the Canfranc Laboratory, together with the activity of most of the components used in the detector and ancillary systems, obtained in a complete assay program. The background contributions have been simulated by means of a dedicated application based on Geant4 and a custom-made code for the detector response. The background model developed for the detector presently installed in Canfranc points to levels from 1 to 10 counts keV-1kg-1day-1\documentclass[12pt]{minimal}{-\begin{document}$$\hbox {keV}<^>{-1}\ \hbox {kg}<^>{-1}\ \hbox {day}<^>{-1}$$\end{document} in the region of interest, making TREX-DM competitive in the search for low-mass WIMPs. A roadmap to further decrease it down to 0.1 counts keV(-1)kg(-1)day(-1)}\ \hbox {day}<^>{-1}$$\end{document} is underway. info:eu-repo/grantAgreement/EC/FP7/240054/EU/Novel Developments in Time Projection Chambers (TPCs) for Rare Event Searches in Underground Astroparticle EXperiments/TREX info:eu-repo/grantAgreement/ES/MINECO/FPA2013-41085-P info:eu-repo/grantAgreement/ES/MINECO/FPA2016-76978-C3-1-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 Cebrian, S. Universidad de Zaragoza (orcid)0000-0002-6948-5101 Coarasa, I. Universidad de Zaragoza (orcid)0000-0002-8100-1368 Dafni, T. Universidad de Zaragoza (orcid)0000-0002-8921-910X Galan, J. Universidad de Zaragoza (orcid)0000-0001-7529-9834 Iguaz, F.J. (orcid)0000-0001-6327-9369 García Irastorza, I. Universidad de Zaragoza (orcid)0000-0003-1163-1687 Luzón, G. Universidad de Zaragoza (orcid)0000-0002-5352-1884 Mirallas, H. Universidad de Zaragoza (orcid)0000-0002-9951-8680 Ortiz de Solórzano, A. Universidad de Zaragoza (orcid)0000-0001-8278-6032 Ruiz-Chóliz, E. Universidad de Zaragoza (orcid)0000-0002-2417-7121 2004 X Universidad de Zaragoza Dpto. Física Teórica Proy. investigación HCA 2004 390 Universidad de Zaragoza Dpto. Física Teórica Área Física Atóm.Molec.y Nucl. 79, 9 (2019), 782 [19 pp.] Eur. phys. j., C The European Physical Journal C 1434-6044 2210349 http://zaguan.unizar.es/record/85437/files/texto_completo.pdf Versión publicada 111793 http://zaguan.unizar.es/record/85437/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:85437 articulos driver 2025-07-22-15:35:40 ARTICLE