Publications (79)
Search for Neutrinoless Double-Beta Decay in Xe with EXO-200
M. Auger, D. J. Auty, P. S. Barbeau +75
We report on a search for neutrinoless double-beta decay of Xe with EXO-200. No signal is observed for an exposure of 32.5 kg-yr, with a background of ~1.5 x 10^{-3} /(kg y…
Detection of krypton in xenon for dark matter applications
A. Dobi, C. G. Davis, C. Hall +3
We extend our technique for observing very small concentrations of impurities in xenon gas to the problem of krypton detection. We use a conventional mass spectrometer to identify…
A Detailed Look at the First Results from the Large Underground Xenon (LUX) Dark Matter Experiment
M. Szydagis, D. S. Akerib, H. M. Araujo +77
LUX, the world's largest dual-phase xenon time-projection chamber, with a fiducial target mass of 118 kg and 10,091 kg-days of exposure thus far, is currently the most sensitive di…
The Large Underground Xenon (LUX) Experiment
D. S. Akerib, X. Bai, S. Bedikian +91
The Large Underground Xenon (LUX) collaboration has designed and constructed a dual-phase xenon detector, in order to conduct a search for Weakly Interacting Massive Particles(WIMP…
Dynamical mass measurements of two protoplanetary discs
G. Lodato, L. Rampinelli, E. Viscardi +8
ALMA observations of line emission from planet forming discs have demonstrated to be an excellent tool to probe the internal disc kinematics, often revealing subtle effects related…
Multi-wavelength observations of protoplanetary discs as a proxy for the gas disc mass
B. Veronesi, G. Lodato, G. Dipierro +3
Recent observations of protoplanetary discs reveal disc substructures potentially caused by embedded planets. We investigate how the gas surface density in discs changes the observ…
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.…
The chemistry of protoplanetary fragments formed via gravitational instabilities
J. D. Ilee, D. H. Forgan, M. G. Evans +8
In this paper, we model the chemical evolution of a 0.25 M protoplanetary disc surrounding a 1 M star that undergoes fragmentation due to self-gravity. We use S…
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…
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…
Tapered helical undulator system for high efficiency energy extraction from a high brightness electron beam
Y. Park, R. Agustsson, W. J. Berg +18
In this paper we discuss the design choices and construction strategy of the tapered undulator system designed for a high energy extraction efficiency experiment in the ultraviolet…
A simple radionuclide-driven single-ion source
M. Montero DÃez, K. Twelker, W. Fairbank +54
We describe a source capable of producing single barium ions through nuclear recoils in radioactive decay. The source is fabricated by electroplating 148Gd onto a silicon α-partic…
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…
Young double-slit interference with single hard x-ray photons
T. E. Gureyev, C. Hall, B. Arhatari +4
Young double-slit experiments using monochromatic hard X-rays with the energy of 25 keV are presented. The experiments were performed at a synchrotron source with a distance of 110…
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…
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…
A Xenon Condenser with a Remote Liquid Storage Vessel
S. Slutsky, Y. -R. Yen, H. Breuer +7
We describe the design and operation of a system for xenon liquefaction in which the condenser is separated from the liquid storage vessel. The condenser is cooled by a pulse tube…
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…
Data Acquisition and Readout System for the LUX Dark Matter Experiment
D. S. Akerib, X. Bai, S. Bedikian +60
LUX is a two-phase (liquid/gas) xenon time projection chamber designed to detect nuclear recoils from interactions with dark matter particles. Signals from the LUX detector are pro…
Constraining Radon Backgrounds in LZ
E. H. Miller, J. Busenitz, T. K. Edberg +8
The LZ dark matter detector, like many other rare-event searches, will suffer from backgrounds due to the radioactive decay of radon daughters. In order to achieve its science goal…
The Evolution of Disk Winds from a Combined Study of Optical and Infrared Forbidden Lines
I. Pascucci, A. Banzatti, U. Gorti +18
We analyze high-resolution (dv=<10km/s) optical and infrared spectra covering the [OI] 6300 angstrom and [NeII] 12.81 micron lines from a sample of 31 disks in different evolutiona…
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…
Radio-assay of Titanium samples for the LUX Experiment
D. S. Akerib, X. Bai, S. Bedikian +63
We report on the screening of samples of titanium metal for their radio-purity. The screening process described in this work led to the selection of materials used in the construct…
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…
Are falling planets spinning up their host stars?
D. J. A. Brown, A. Collier Cameron, C. Hall +2
We investigate the effects of tidal interactions on the planetary orbits and stellar spin rates of the WASP-18 and WASP-19 planetary systems using a forward integration scheme. By…
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…
First observation of Li ground state
Z. Kohley, E. Lunderberg, P. A. DeYoung +16
The ground state of neutron-rich unbound Li was observed for the first time in a one-proton removal reaction from Be at a beam energy of 53.6 MeV/u. The Li gro…
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.…
Study of a zirconium getter for purification of xenon gas
A. Dobi, D. S. Leonard, C. Hall +4
Oxygen, nitrogen and methane purification efficiencies for a common zirconium getter are measured in 1050 Torr of xenon gas. Starting with impurity concentrations near 10^{-6} g/g,…
Predicting the kinematic evidence of gravitational instability
C. Hall, R. Dong, R. Teague +6
Observations with the Atacama Large Millimeter/Submillimeter array (ALMA) have dramatically improved our understanding of the site of exoplanet formation: protoplanetary discs. How…
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…
Xenon purity analysis for EXO-200 via mass spectrometry
A. Dobi, C. Hall, S. Slutsky +73
We describe purity measurements of the natural and enriched xenon stockpiles used by the EXO-200 double beta decay experiment based on a mass spectrometry technique. The sensitivit…
New method of 85Kr reduction in a noble gas based low-background detector
D. Yu. Akimov, A. I. Bolozdynya, A. A. Burenkov +4
Krypton-85 is an anthropogenic beta-decaying isotope which produces low energy backgrounds in dark matter and neutrino experiments, especially those based upon liquid xenon. Severa…
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^…
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)…
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…
Spiral Arms and a Massive Dust Disk with non-Keplerian Kinematics: Possible Evidence for Gravitational Instability in the Disk of Elias 2-27
T. Paneque-Carreño, L. M. Perez, M. Benisty +16
To determine the origin of the spiral structure observed in the dust continuum emission of Elias 2-27 we analyze multi-wavelength continuum ALMA data with a resolution of 0.2…
An Ultra-Low Background PMT for Liquid Xenon Detectors
D. S. Akerib, X. Bai, E. Bernard +64
Results are presented from radioactivity screening of two models of photomultiplier tubes designed for use in current and future liquid xenon experiments. The Hamamatsu 5.6 cm diam…
First results from the LUX dark matter experiment at the Sanford Underground Research Facility
LUX Collaboration, D. S. Akerib, H. M. Araujo +100
The Large Underground Xenon (LUX) experiment, a dual-phase xenon time-projection chamber operating at the Sanford Underground Research Facility (Lead, South Dakota), was cooled and…
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…
After LUX: The LZ Program
D. C. Malling, D. S. Akerib, H. M. Araujo +71
The LZ program consists of two stages of direct dark matter searches using liquid Xe detectors. The first stage will be a 1.5-3 tonne detector, while the last stage will be a 20 to…
LUXSim: A Component-Centric Approach to Low-Background Simulations
D. S. Akerib, X. Bai, S. Bedikian +60
Geant4 has been used throughout the nuclear and high-energy physics community to simulate energy depositions in various detectors and materials. These simulations have mostly been…
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…
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 magnetically-driven piston pump for ultra-clean applications
F. LePort, R. Neilson, P. S. Barbeau +77
A magnetically driven piston pump for xenon gas recirculation is presented. The pump is designed to satisfy extreme purity and containment requirements, as is appropriate for the r…
Neutrinos
A. de Gouvea, K. Pitts, K. Scholberg +164
This document represents the response of the Intensity Frontier Neutrino Working Group to the Snowmass charge. We summarize the current status of neutrino physics and identify many…
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…
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…
Towards a population synthesis model of self-gravitating disc fragmentation and tidal downsizing II: The effect of fragment-fragment interactions
D. H. Forgan, C. Hall, F. Meru +1
It is likely that most protostellar systems undergo a brief phase where the protostellar disc is self-gravitating. If these discs are prone to fragmentation, then they are able to…
Study of radon reduction in gases for rare event search experiments
K. Pushkin, C. Akerlof, D. Anbajagane +15
The noble elements, argon and xenon, are frequently employed as the target and event detector for weakly interacting particles such as neutrinos and Dark Matter. For such rare proc…
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…
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…
The EXO-200 detector, part I: Detector design and construction
M. Auger, D. J. Auty, P. S. Barbeau +78
EXO-200 is an experiment designed to search for double beta decay of Xe with a single-phase, liquid xenon detector. It uses an active mass of 110 kg of xenon enriched to 80…
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…
A simple high-sensitivity technique for purity analysis of xenon gas
D. S. Leonard, A. Dobi, C. Hall +4
We report on the development and performance of a high-sensitivity purity-analysis technique for gaseous xenon. The gas is sampled at macroscopic pressure from the system of intere…
Antimatter Propulsion for Interstellar Travel via Positron Production from Potassium-40 Rich Biological Matter
C. Hall, L. N. H. P. Hall
Anitmatter-based propulsion is often cited as a physically plausible route to relativistic interstellar travel, and thus as a potential mechanism by which technologically advanced…
Adaptive Matching Of The IOTA Ring Linear Optics For Space Charge Compensation
A. Romanov, A. Valishev, D. L. Bruhwiler +2
Many present and future accelerators must operate with high intensity beams when distortions induced by space charge forces are among major limiting factors. Betatron tune depressi…
The LUX Prototype Detector: Heat Exchanger Development
D. S. Akerib, X. Bai, S. Bedikian +47
The LUX (Large Underground Xenon) detector is a two-phase xenon Time Projection Chamber (TPC) designed to search for WIMP-nucleon dark matter interactions. As with all noble elemen…
Kinematic Evidence of an Embedded Protoplanet in HD 142666 Identified by Machine Learning
J. P. Terry, C. Hall, S. Abreau +1
Observations of protoplanetary disks have shown that forming exoplanets leave characteristic imprints on the gas and dust of the disk. In the gas, these forming exoplanets cause de…
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…
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…
A New Definition of Exoplanet Habitability: Introducing the Photosynthetic Habitable Zone
C. Hall, P. C. Stancil, J. P. Terry +1
It may be possible to detect biosignatures of photosynthesis in an exoplanet's atmosphere. However, such a detection would likely require a dedicated study, occupying a large amoun…
Radiogenic and Muon-Induced Backgrounds in the LUX Dark Matter Detector
D. S. Akerib, H. M. Araujo, X. Bai +77
The Large Underground Xenon (LUX) dark matter experiment aims to detect rare low-energy interactions from Weakly Interacting Massive Particles (WIMPs). The radiogenic backgrounds i…
Searching for wide-orbit gravitational instability protoplanets with ALMA in the dust continuum
J. Humphries, C. Hall, T. J. Haworth +1
Searches for young gas giant planets at wide separations have so far focused on techniques appropriate for compact (Jupiter sized) planets. Here we point out that protoplanets born…
Rings and gaps in the disc around Elias 24 revealed by ALMA
G. Dipierro, L. Ricci, L. Pérez +16
We present Atacama Large Millimeter/sub-millimeter Array (ALMA) Cycle 2 observations of the 1.3 mm dust continuum emission of the protoplanetary disc surrounding the T Tauri star E…
Deep Brain Stimulation for Parkinson's Disease: a survey of experiences perceived by recipients and carers
N. W. Page, C. Hall, S. D. Page
Perceived outcomes from DBS for PD were sampled for 52 cases by surveying 46 DBS recipients and 45 carers. Post-DBS experience ranged from 10-129 months. There were significant var…
Constraining protoplanetary disc mass using the GI wiggle
J. P. Terry, C. Hall, Cristiano Longarini +5
Exoplanets form in protoplanetary accretion discs. The total protoplanetary disc mass is the most fundamental parameter, since it sets the mass budget for planet formation. Althoug…
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…
Status of the LUX Dark Matter Search
S. Fiorucci, D. S. Akerib, S. Bedikian +44
The Large Underground Xenon (LUX) dark matter search experiment is currently being deployed at the Homestake Laboratory in South Dakota. We will highlight the main elements of desi…
Non-simple abelian varieties in a family: geometric and analytic approaches
J. Ellenberg, C. Elsholtz, C. Hall +1
Let be a family of abelian varieties over a number field parametrized by a rational coordinate , and suppose the generic fiber of is geometrically simple. For ex…
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…
Technical Results from the Surface Run of the LUX Dark Matter Experiment
LUX Collaboration, D. S. Akerib, X. Bai +64
We present the results of the three-month above-ground commissioning run of the Large Underground Xenon (LUX) experiment at the Sanford Underground Research Facility located in Lea…