Publications (50)
First direct measurement of Ca single -decay Q value with the TITAN Penning trap
S. Kakkar, D. Perera, J. Ash +19
Neutrinoless double -decay (0), if observed, would provide unequivocal evidence of physics beyond the Standard Model. Ca is an interesting candidate system to st…
Measurements of the ion fraction and mobility of alpha and beta decay products in liquid xenon using EXO-200
J. B. Albert, D. J. Auty, P. S. Barbeau +82
Alpha decays in the EXO-200 detector are used to measure the fraction of charged and daughters created from alpha and beta decays, respectiv…
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…
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…
Characterization of external cross-talk from silicon photomultipliers in a liquid xenon detector
D Gallacher, A. de St. Croix, S. Bron +28
The Light-only Liquid Xenon experiment (LoLX) employs a small-scale detector equipped with 96 Hamamatsu VUV4 silicon photomultipliers (SiPMs) submerged in 5 kg of liquid xenon (LXe…
Reflectance of Silicon Photomultipliers at Vacuum Ultraviolet Wavelengths
P. Lv, G. F. Cao, L. J. Wen +148
Characterization of the vacuum ultraviolet (VUV) reflectance of silicon photomultipliers (SiPMs) is important for large-scale SiPM-based photodetector systems. We report the angula…
Search for decay of Xe to the 0 excited state of Ba with EXO-200
200 Collaboration, J. B. Albert, D. J. Auty +88
EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless double-beta decay of Xe to the ground state of Ba. We report here on a search fo…
Search for Neutrinoless Double-Beta Decay with the Complete EXO-200 Dataset
G. Anton, I. Badhrees, P. S. Barbeau +99
A search for neutrinoless double-beta decay () in Xe is performed with the full EXO-200 dataset using a deep neural network to discriminate between and b…
Imaging individual barium atoms in solid xenon for barium tagging in nEXO
C. Chambers, T. Walton, D. Fairbank +148
The search for neutrinoless double beta decay probes the fundamental properties of neutrinos, including whether or not the neutrino and antineutrino are distinct. Double beta detec…
Generative Adversarial Networks for Scintillation Signal Simulation in EXO-200
S. Li, I. Ostrovskiy, Z. Li +87
Generative Adversarial Networks trained on samples of simulated or actual events have been proposed as a way of generating large simulated datasets at a reduced computational cost.…
Mass measurements of Yb identify an anomalous proton-neutron interaction
C. L. Brown, J. Ash, B. Ashrafkhani +30
Mass measurements of nuclei can identify structurally-driven trends in binding energy across isotopic chains, and can also isolate specific nucleon-nucleon interactions, such as th…
Measurements of electron transport in liquid and gas Xenon using a laser-driven photocathode
O. Njoya, T. Tsang, M. Tarka +153
Measurements of electron drift properties in liquid and gaseous xenon are reported. The electrons are generated by the photoelectric effect in a semi-transparent gold photocathode…
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}…
Search for Neutrinoless Double-Beta Decay with the Upgraded EXO-200 Detector
J. B. Albert, G. Anton, I. Badhrees +90
Results from a search for neutrinoless double-beta decay of Xe are presented using the first year of data taken with the upgraded EXO-200 detector. Relative to pr…
Reflectivity of VUV-sensitive Silicon Photomultipliers in Liquid Xenon
M. Wagenpfeil, T. Ziegler, J. Schneider +140
Silicon photomultipliers are regarded as a very promising technology for next-generation, cutting-edge detectors for low-background experiments in particle physics. This work prese…
Characterization of the Hamamatsu VUV4 MPPCs for nEXO
G. Gallina, P. Giampa, F. Retiere +148
In this paper we report on the characterization of the Hamamatsu VUV4 (S/N: S13370-6152) Vacuum Ultra-Violet (VUV) sensitive Silicon Photo-Multipliers (SiPMs) as part of the develo…
Formation of gaseous, doubly charged cerium monofluoride CeF and its sensitivity to new physics
R. Simpson, C. Zülch, K. B. Ng +25
Tricationic protactinium monofluoride (PaF) has been proposed as a candidate for probing physics beyond the Standard Model of particle physics. Since studies with $^…
'Searching for a needle in a haystack;' A Ba-tagging approach for an upgraded nEXO experiment
H. Rasiwala, K. Murray, Y. Lan +17
nEXO is a proposed experiment that will search for neutrinoless double-beta decay (0) in 5-tonnes of liquid xenon (LXe), isotopically enriched in Xe. A technique ca…
Measurement of the Spectral Shape of the beta-decay of 137Xe to the Ground State of 137Cs in EXO-200 and Comparison with Theory
S. Al Kharusi, G. Anton, I. Badhrees +105
We report on a comparison between the theoretically predicted and experimentally measured spectra of the first-forbidden non-unique -decay transition $^{137}\textrm{Xe}(7/2^-)\…
First Search for Lorentz and CPT Violation in Double Beta Decay with EXO-200
200 Collaboration, J. B. Albert, P. S. Barbeau +86
A search for Lorentz- and CPT-violating signals in the double beta decay spectrum of Xe has been performed using an exposure of 100 kgyr with the EXO-200 detector. N…
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…
Search for Majoron-emitting modes of double-beta decay of Xe with EXO-200
200 Collaboration, J. B. Albert, D. J. Auty +89
EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless double-beta decay of Xe. Here we report on a search for various Majoron-emitting modes b…
Characterization of a Spatially Resolved Multi-Element Laser Ablation Ion Source
K. Murray, C. Chambers, D. Chen +14
A laser ablation ion source (LAS) is a powerful tool by which diverse species of ions can be produced for mass spectrometer calibration, or surface study applications. It is necess…
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…
Measurement of the Drift Velocity and Transverse Diffusion of Electrons in Liquid Xenon with the EXO-200 Detector
200 Collaboration, J. B. Albert, P. S. Barbeau +84
The EXO-200 Collaboration is searching for neutrinoless double beta decay using a liquid xenon (LXe) time projection chamber. This measurement relies on modeling the transport of c…
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…
Cosmogenic Backgrounds to 0νββ in EXO-200
200 Collaboration, J. B. Albert, D. J. Auty +84
As neutrinoless double-beta decay experiments become more sensitive and intrinsic radioactivity in detector materials is reduced, previously minor contributions to the background m…
Search for Majorana neutrinos with the first two years of EXO-200 data
200 Collaboration, J. B. Albert, D. J. Auty +91
Many extensions of the Standard Model of particle physics suggest that neutrinos should be Majorana-type fermions, but this assumption is difficult to confirm. Observation of neutr…
Search for Double Beta Decays of Xe with EXO-200 Phase II
S. Al Kharusi, G. Anton, I. Badhrees +102
EXO-200 was a leading double beta decay experiment consisting of a single-phase, enriched liquid xenon time projection chamber filled with an admixture of 80.672% Xe and 19…
Spectroscopy of Ba and Ba deposits in solid xenon for barium tagging in nEXO
B. Mong, S. Cook, T. Walton +73
Progress on a method of barium tagging for the nEXO double beta decay experiment is reported. Absorption and emission spectra for deposits of barium atoms and ions in solid xenon m…
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…
Search for Two-neutrino Double-Beta Decay of to the excited state of with the Complete EXO-200 Dataset
200 Collaboration, S. Al Kharusi, G. Anton +104
A new search for two-neutrino double-beta () decay of to the excited state of is performed with the full EXO-200 dataset. A deep lear…
Sensitivity and discovery potential of the proposed nEXO experiment to neutrinoless double beta decay
nEXO Collaboration, J. B. Albert, G. Anton +143
The next-generation Enriched Xenon Observatory (nEXO) is a proposed experiment to search for neutrinoless double beta () decay in Xe with a target half-life sensit…
An Optimal Energy Estimator to Reduce Correlated Noise for the EXO-200 Light Readout
200 Collaboration, C. G. Davis, C. Hall +84
The energy resolution of the EXO-200 detector is limited by electronics noise in the measurement of the scintillation response. Here we present a new technique to extract optimal s…
Exploring the Onset of Collectivity Approaching N=40 through Manganese Masses
C. Chambers, M. P. Reiter, A. T. Gallant +24
Isotopes in the region of the nuclear chart below have been the subject of intense experimental and theoretical effort due to the potential onset of a new ``isla…
An apparatus to manipulate and identify individual Ba ions from bulk liquid Xe
K. Twelker, S. Kravitz, M. Montero DÃez +77
We describe a system to transport and identify barium ions produced in liquid xenon, as part of R&D towards the second phase of a double beta decay experiment, nEXO. The goal is to…
Simulation of charge readout with segmented tiles in nEXO
Z. Li, W. R. Cen, A. Robinson +150
nEXO is a proposed experiment to search for the neutrino-less double beta decay () of Xe in a tonne-scale liquid xenon time projection chamber (TPC). The nEXO TPC…
Search for Majoron-emitting modes of Xe double beta decay with the complete EXO-200 dataset
S. Al Kharusi, G. Anton, I. Badhrees +103
A search for Majoron-emitting modes of the neutrinoless double-beta decay of Xe is performed with the full EXO-200 dataset. This dataset consists of a total Xe expo…
nEXO Pre-Conceptual Design Report
nEXO Collaboration, S. Al Kharusi, A. Alamre +171
The projected performance and detector configuration of nEXO are described in this pre-Conceptual Design Report (pCDR). nEXO is a tonne-scale neutrinoless double beta () d…
Search for MeV Electron Recoils from Dark Matter in EXO-200
200 Collaboration, S. Al Kharusi, G. Anton +104
We present a search for electron-recoil signatures from the charged-current absorption of fermionic dark matter using the EXO-200 detector. We report an average electron recoil bac…
Searches for Double Beta Decay of Xe with EXO-200
200 Collaboration, J. B. Albert, G. Anton +90
Searches for double beta decay of Xe were performed with EXO-200, a single-phase liquid xenon detector designed to search for neutrinoless double beta decay of Xe.…
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…
An improved measurement of the 2νββ half-life of Xe-136 with EXO-200
J. B. Albert, M. Auger, D. J. Auty +94
We report on an improved measurement of the 2νββ half-life of Xe-136 performed by EXO-200. The use of a large and homogeneous time projection chamber allows for the precise esti…
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…
Search for nucleon decays with EXO-200
J. B. Albert, G. Anton, I. Badhrees +92
A search for instability of nucleons bound in Xe nuclei is reported with 223 kgyr exposure of Xe in the EXO-200 experiment. Lifetime limits of 3.3$\times 10^…
Deep Neural Networks for Energy and Position Reconstruction in EXO-200
S. Delaquis, M. J. Jewell, I. Ostrovskiy +91
We apply deep neural networks (DNN) to data from the EXO-200 experiment. In the studied cases, the DNN is able to reconstruct the relevant parameters - total energy and position -…
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…
Reflectivity and PDE of VUV4 Hamamatsu SiPMs in Liquid Xenon
P. Nakarmi, I. Ostrovskiy, A. K. Soma +152
Understanding reflective properties of materials and photodetection efficiency (PDE) of photodetectors is important for optimizing energy resolution and sensitivity of the next gen…
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}…
Event Reconstruction in a Liquid Xenon Time Projection Chamber with an Optically-Open Field Cage
T. Stiegler, S. Sangiorgio, J. P. Brodsky +148
nEXO is a proposed tonne-scale neutrinoless double beta decay () experiment using liquid (LXe) in a Time Projection Chamber (TPC) to read out ionization and s…