Publications (16)
Mobility of thorium ions in liquid xenon
K. Wamba, C. Hall, M. Breidenbach +27
We present a measurement of the Th ion mobility in LXe at 163.0 K and 0.9 bar. The result obtained, 0.2400.011 (stat) 0.011 (syst) cm/(kV-s), is compared wi…
An integrated online radioassay data storage and analytics tool for nEXO
R. H. M. Tsang, A. Piepke, S. Al Kharusi +157
Large-scale low-background detectors are increasingly used in rare-event searches as experimental collaborations push for enhanced sensitivity. However, building such detectors, in…
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…
Imaging of single barium atoms in a second matrix site in solid xenon for barium tagging in a Xe double beta decay experiment
M. Yvaine, D. Fairbank, J. Soderstrom +134
Neutrinoless double beta decay is one of the most sensitive probes for new physics beyond the Standard Model of particle physics. One of the isotopes under investigation is $^{136}…
Fundamental Symmetries, Neutrons, and Neutrinos (FSNN): Whitepaper for the 2023 NSAC Long Range Plan
B. Acharya, C. Adams, A. A. Aleksandrova +176
This whitepaper presents the research priorities decided on by attendees of the 2022 Town Meeting for Fundamental Symmetries, Neutrons and Neutrinos, which took place December 13-1…
Characterization of large area APDs for the EXO-200 detector
R. Neilson, F. LePort, A. Pocar +49
EXO-200 uses 468 large area avalanche photodiodes (LAAPDs) for detection of scintillation light in an ultra-low-background liquid xenon (LXe) detector. We describe initial measurem…
Performance of novel VUV-sensitive Silicon Photo-Multipliers for nEXO
G. Gallina, Y. Guan, F. Retiere +162
Liquid xenon time projection chambers are promising detectors to search for neutrinoless double beta decay (0), due to their response uniformity, monolithic sensitive volum…
Observation of Two-Neutrino Double-Beta Decay in Xe-136 with EXO-200
N. Ackerman, B. Aharmim, M. Auger +100
We report the observation of two-neutrino double-beta decay in Xe-136 with T_1/2 = 2.11 +- 0.04 (stat.) +- 0.21 (sys.) x 10^21 yr. This second order process, predicted by the Stand…
Correlated Fluctuations between Luminescence and Ionization in Liquid Xenon
E. Conti, R. DeVoe, G. Gratta +19
The ionization of liquefied noble gases by radiation is known to be accompanied by fluctuations much larger than predicted by Poisson statistics. We have studied the fluctuations o…
Development of a Xe calibration source for nEXO
B. G. Lenardo, C. A. Hardy, R. H. M. Tsang +125
We study a possible calibration technique for the nEXO experiment using a Xe electron capture source. nEXO is a next-generation search for neutrinoless double beta decay ($…
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…
Observation of single collisionally cooled trapped ions in a buffer gas
M. Green, J. Wodin, R. DeVoe +37
Individual Ba ions are trapped in a gas-filled linear ion trap and observed with a high signal-to-noise ratio by resonance fluorescence. Single-ion storage times of ~5 min (~1 min)…
Trace radioactive impurities in final construction materials for EXO-200
D. S. Leonard, D. Auty, T. Didberidze +98
We report results from a systematic measurement campaign conducted to identify low radioactivity materials for the construction of the EXO-200 double beta decay experiment. Partial…
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…
NEXO: Neutrinoless double beta decay search beyond year half-life sensitivity
nEXO Collaboration, G. Adhikari, S. Al Kharusi +158
The nEXO neutrinoless double beta decay experiment is designed to use a time projection chamber and 5000 kg of isotopically enriched liquid xenon to search for the decay in $^{136}…