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The EXO-200 detector, part II: Auxiliary Systems
N. Ackerman, J. Albert, M. Auger +157
The EXO-200 experiment searched for neutrinoless double-beta decay of Xe with a single-phase liquid xenon detector. It used an active mass of 110 kg of 80.6%-enriched liqui…
Pulseshape discrimination against low-energy Ar-39 beta decays in liquid argon with 4.5 tonne-years of DEAP-3600 data
The DEAP Collaboration, P. Adhikari, R. Ajaj +126
The DEAP-3600 detector searches for the scintillation signal from dark matter particles scattering on a 3.3 tonne liquid argon target. The largest background comes from Ar b…
Measurement of the scintillation and ionization response of liquid xenon at MeV energies in the EXO-200 experiment
200 Collaboration, G. Anton, I. Badhrees +99
Liquid xenon (LXe) is employed in a number of current and future detectors for rare event searches. We use the EXO-200 experimental data to measure the absolute scintillation and i…
Study of Silicon Photomultiplier Performance in External Electric Fields
X. L. Sun, T. Tolba, G. F. Cao +149
We report on the performance of silicon photomultiplier (SiPM) light sensors operating in electric field strength up to 30 kV/cm and at a temperature of 149K, relative to their per…
VUV-sensitive Silicon Photomultipliers for Xenon Scintillation Light Detection in nEXO
A. Jamil, T. Ziegler, P. Hufschmidt +140
Future tonne-scale liquefied noble gas detectors depend on efficient light detection in the VUV range. In the past years Silicon Photomultipliers (SiPMs) have emerged as a valid al…
Characterization of an Ionization Readout Tile for nEXO
nEXO Collaboration, M. Jewell, A. Schubert +142
A new design for the anode of a time projection chamber, consisting of a charge-detecting "tile", is investigated for use in large scale liquid xenon detectors. The tile is produce…
Investigation of radioactivity-induced backgrounds in EXO-200
J. B. Albert, D. J. Auty, P. S. Barbeau +83
The search for neutrinoless double-beta decay (0νββ) requires extremely low background and a good understanding of their sources and their influence on the rate in the region of pa…
A xenon gas purity monitor for EXO
EXO Collaboration, A. Dobi, C. Hall +57
We discuss the design, operation, and calibration of two versions of a xenon gas purity monitor (GPM) developed for the EXO double beta decay program. The devices are sensitive to…
Characterization of large area APDs for the EXO-200 detector
R. Neilson, F. LePort, A. Pocar +49
EXO-200 uses 468 large area avalanche photodiodes (LAAPDs) for detection of scintillation light in an ultra-low-background liquid xenon (LXe) detector. We describe initial measurem…
Wavelength Shifters for Water Cherenkov Detectors
Xiongxin Dai, Etienne Rollin, Alain Bellerive +4
The light yield of a water-based Cherenkov detector can be significantly improved by adding a wavelength shifter. Wavelength shifter (WLS) molecules absorb ultraviolet photons and…
Systematic study of trace radioactive impurities in candidate construction materials for EXO-200
D. S. Leonard, P. Grinberg, P. Weber +54
The Enriched Xenon Observatory (EXO) will search for double beta decays of 136Xe. We report the results of a systematic study of trace concentrations of radioactive impurities in a…
A linear RFQ ion trap for the Enriched Xenon Observatory
B. Flatt, M. Green, J. Wodin +39
The design, construction, and performance of a linear radio-frequency ion trap (RFQ) intended for use in the Enriched Xenon Observatory (EXO) are described. EXO aims to detect the…
A liquid xenon ionization chamber in an all-fluoropolymer vessel
EXO Collaboration, F. LePort, A. Pocar +42
A novel technique has been developed to build vessels for liquid xenon ionization detectors entirely out of ultra-clean fluoropolymer. We describe the advantages in terms of low ra…