Background assessment for the TREX Dark Matter experiment

Bibliographic Details
Title: Background assessment for the TREX Dark Matter experiment
Authors: Castel, J., Cebrian, S., Coarasa, I., Dafni, T., Galan, J., Iguaz, F. J., Irastorza, I. G., Luzon, G., Mirallas, H., de Solorzano, A. Ortiz, Ruiz-Choliz, E.
Source: Eur. Phys. J. C 79 (2019) 782
Publication Year: 2018
Collection: Astrophysics
High Energy Physics - Experiment
Physics (Other)
Subject Terms: Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Astrophysics of Galaxies, High Energy Physics - Experiment, Physics - Instrumentation and Detectors
More Details: 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 20 l 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, allowing for thresholds below 0.4 keV (electron equivalent). 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-1 kg-1 d-1 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 d-1 is underway.
Comment: Final version, as accepted in Eur. Phys. J. C
Document Type: Working Paper
DOI: 10.1140/epjc/s10052-019-7282-6
Access URL: http://arxiv.org/abs/1812.04519
Accession Number: edsarx.1812.04519
Database: arXiv
More Details
DOI:10.1140/epjc/s10052-019-7282-6