A5014447873- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Quantum, superfluid, helium dynamics
- High-Energy Particle Collisions Research
- Nuclear Physics and Applications
- Census and Population Estimation
- Advanced Semiconductor Detectors and Materials
- Atmospheric Ozone and Climate
- Photocathodes and Microchannel Plates
- Nuclear physics research studies
Triangle Universities Nuclear Laboratory
2019-2024
Duke University
2019-2024
Economic Policy Institute
2023
King's College London
2023
Lawrence Livermore National Laboratory
2020
A search for neutrinoless double-beta decay ($0\nu\beta\beta$) in $^{136}$Xe is performed with the full EXO-200 dataset using a deep neural network to discriminate between $0\nu\beta\beta$ and background events. Relative previous analyses, signal detection efficiency has been raised from 80.8% 96.4$\pm$3.0% energy resolution of detector at Q-value improved $\sigma/E=1.23\%$ $1.15\pm0.02\%$ upgraded detector. Accounting new data, median 90% confidence level half-life sensitivity this analysis...
We report the first measurement of coherent elastic neutrino-nucleus scattering (CEvNS) on argon using a liquid detector at Oak Ridge National Laboratory Spallation Neutron Source. Two independent analyses prefer CEvNS over background-only null hypothesis with greater than $3\ensuremath{\sigma}$ significance. The measured cross section, averaged incident neutrino flux, is $(2.2\ifmmode\pm\else\textpm\fi{}0.7)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}39}\text{ }\text{...
We measured the cross section of coherent elastic neutrino-nucleus scattering (CEvNS) using a CsI[Na] scintillating crystal in high flux neutrinos produced at Spallation Neutron Source Oak Ridge National Laboratory. New data collected before detector decommissioning have more than doubled dataset since first observation CEvNS, achieved with this detector. Systematic uncertainties also been reduced an updated quenching model, allowing for improved precision. With these analysis improvements,...
The COHERENT Collaboration searched for scalar dark matter particles produced at the Spallation Neutron Source with masses between 1 and 220 MeV/c^{2} using a CsI[Na] scintillation detector sensitive to nuclear recoils above 9 keV_{nr}. No evidence is found we thus place limits on allowed parameter space. With this low-threshold detector, are coherent elastic scattering nuclei. cross section process orders of magnitude higher than other processes historically used accelerator-based...
The COHERENT experiment is well poised to test sub-GeV dark matter models using low-energy recoil detectors sensitive coherent elastic neutrino-nucleus scattering (CEvNS) in the $\pi$-DAR neutrino beam produced by Spallation Neutron Source. We show how a planned 750-kg liquid argon scintillation detector would place leading limits on scalar light models, over two orders of magnitude mass, for particles through vector and leptophobic portals absence other effects beyond standard model....
The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory is a pulsed source of neutrons and, as by-product this operation, an intense neutrinos via stopped-pion decay. COHERENT collaboration uses to investigate coherent elastic neutrino-nucleus scattering and other physics with suite detectors. This work includes description our geant4 simulation neutrino production the SNS flux calculation which informs studies. We estimate uncertainty $\ensuremath{\sim}10%$ level based on...
Coherent elastic neutrino-nucleus scattering (CEvNS) is the dominant neutrino channel for neutrinos of energy $E_\nu < 100$ MeV. We report a limit this process using data collected in an engineering run 29 kg CENNS-10 liquid argon detector located 27.5 m from Oak Ridge National Laboratory Spallation Neutron Source (SNS) Hg target with $4.2\times 10^{22}$ protons on target. The dataset yielded $< 7.4$ observed CEvNS events implying cross section process, averaged over SNS pion decay-at-rest...
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 absolute scintillation ionization yields generated by $\ensuremath{\gamma}$ interactions from $^{228}\mathrm{Th}$ (2615 keV), $^{226}\mathrm{Ra}$ (1764 $^{60}\mathrm{Co}$ (1332 keV 1173 keV) calibration sources, over range electric fields. The $W$ value that defines recombination-independent energy scale measured be...
The NEWS-G collaboration uses spherical proportional counters (SPCs) to search for weakly interacting massive particles (WIMPs). In this paper, we report the first measurements of nuclear quenching factor in neon gas at 2 bar using an SPC deployed a neutron beam TUNL facility. energy-dependence is modeled simple power law: $\ensuremath{\alpha}{\mathrm{E}}_{\mathrm{nr}}^{\ensuremath{\beta}}$; determine its parameters by simultaneously fitting data collected with detector over range energies....
Using an 185-kg NaI[Tl] array, COHERENT has measured the inclusive electron-neutrino charged-current cross section on ^{127}I with pion decay-at-rest neutrinos produced by Spallation Neutron Source at Oak Ridge National Laboratory. Iodine is one heaviest targets for which low-energy (≤50 MeV) inelastic neutrino-nucleus processes have been measured, and this first measurement of its section. After a five-year detector exposure, reports flux-averaged electron 9.2_{-1.8}^{+2.1}×10^{-40} cm^{2}....
We present a search for electron-recoil signatures from the charged-current absorption of fermionic dark matter using EXO-200 detector. report an average background rate $6.8\ifmmode\times\else\texttimes\fi{}{10}^{4}\text{ }\text{ }\mathrm{cts}\text{ }{\mathrm{kg}}^{\ensuremath{-}1}\text{ }{\mathrm{yr}}^{\ensuremath{-}1}\text{ }{\mathrm{keV}}^{\ensuremath{-}1}$ above 4 MeV and find no statistically significant excess over our projection. Using total $^{136}\mathrm{Xe}$ exposure 234.1 kg yr,...
Dual-phase xenon detectors lead the search for keV-scale nuclear recoil signals expected from scattering of weakly interacting massive particle (WIMP) dark matter, and can potentially be used to study coherent MeV-scale neutrinos. New capabilities such experiments enabled by extending their searches down lowest measurable energy. The response liquid target medium recoils, however, is not well characterized below a few keV, leading large uncertainties in projected sensitivities. In this work,...
A search for Majoron-emitting modes of the neutrinoless double-beta decay $^{136}$Xe is performed with full EXO-200 dataset. This dataset consists a total exposure 234.1 kg$\cdot$yr, and includes data detector upgrades that have improved energy threshold relative to previous searches. lower limit T$_{1/2}^{\rm{^{136}Xe}}>$4.3$\cdot$10$^{24}$ yr at 90\% C.L. on half-life spectral index $n=1$ Majoron was obtained, factor 3.6 more stringent than from EXO-200, corresponding constraint...
We report on the technical design and expected performance of a 592 kg heavy-water-Cherenkov detector to measure absolute neutrino flux from pion-decay-at-rest source at Spallation Neutron Source (SNS) Oak Ridge National Laboratory (ORNL). The will be located roughly 20 m SNS target with better than 5% statistical uncertainty in 2 years. This heavy-water serve as first module two-module system ultimately 2-3% both First Target Station planned Second SNS. significantly reduce dominant...
Abstract Testing the DAMA/LIBRA annual modulation result independently of dark matter particle and halo models has been a challenge for twenty years. Using same target material, NaI(Tl), is required presently two experiments, ANAIS-112 COSINE-100, are running such goal. A precise knowledge detector response to nuclear recoils mandatory because this most likely channel find signal. The light produced by quenched with respect that electrons factor be measured experimentally. However, current...
Abstract We present results of several measurements CsI[Na] scintillation response to 3–60 keV energy nuclear recoils performed by the COHERENT collaboration using tagged neutron elastic scattering experiments and an endpoint technique. Earlier results, used estimate coherent neutrino-nucleus (CEvNS) event rate for first observation this process achieved at Spallation Neutron Source (SNS), have been reassessed. discuss corrections identified systematic effects update respective uncertainty...
We consider the potential for a 10 kg undoped cryogenic CsI detector operating at Spallation Neutron Source to measure coherent elastic neutrino-nucleus scattering and its sensitivity discover new physics beyond standard model (BSM). Through combination of increased event rate, lower threshold, good timing resolution, such would significantly improve on past measurements. considered tests several BSM scenarios as neutrino nonstandard interactions accelerator-produced dark matter. This...
We report the first detection of coherent elastic neutrino-nucleus scattering (CEvNS) on germanium, measured at Spallation Neutron Source Oak Ridge National Laboratory. The Ge-Mini detector COHERENT collaboration employs large-mass, low-noise, high-purity germanium spectrometers, enabling excellent energy resolution, and an analysis threshold 1.5 keV electron-equivalent ionization energy. observe a on-beam excess 20.6$_{+7.1}^{-6.3}$ counts with total exposure 10.22 GWhkg we reject no-CEvNS...
Generative Adversarial Networks trained on samples of simulated or actual events have been proposed as a way generating large datasets at reduced computational cost. In this work, novel approach to perform the simulation photodetector signals from time projection chamber EXO-200 experiment is demonstrated. The method based Wasserstein Network - deep learning technique allowing for implicit non-parametric estimation population distribution given set objects. Our network real calibration data...
Using neutrinos produced at the Spallation Neutron Source (SNS) Oak Ridge National Laboratory (ORNL), COHERENT collaboration has studied $\mathrm{Pb}({\ensuremath{\nu}}_{e},\mathrm{X}n)$ process with a lead neutrino-induced-neutron (NIN) detector. Data from this detector are fit jointly previously collected data on process. A combined analysis of two datasets yields cross section that is ${0.29}_{\ensuremath{-}0.16}^{+0.17}$ times predicted by MARLEY event generator using...
We report on a comparison between the theoretically predicted and experimentally measured spectra of first-forbidden nonunique β-decay transition 137Xe(7/2−)→137Cs(7/2+). The experimental data were acquired by EXO-200 experiment during deployment an AmBe neutron source. ultralow background environment EXO-200, together with dedicated source analysis procedures, allowed for collection pure sample decays, estimated signal to ratio more than 99 1 in energy range from 1075 4175 keV. In addition...
The non-linear energy response of the plastic scintillator EJ-260 is measured with MicroCHANDLER detector, using neutron beams 5 to 27 MeV at Triangle Universities Nuclear Laboratory. first and second order Birks' constants are extracted from data, found be $k_B = (8.70 \pm 0.93)\times 10^{-3}\ {\rm g/cm^2/MeV}$ $k_C (1.42 1.00) \times 10^{-5}\ (g/cm^2/MeV)^2}$. This result covers a unique range that direct relevance for fast backgrounds in reactor inverse beta decay detectors. These...
We present the analysis and results of first dataset collected with MARS neutron detector deployed at Oak Ridge National Laboratory Spallation Neutron Source (SNS) for purpose monitoring characterizing beam-related (BRN) background COHERENT collaboration. was positioned next to COH-CsI coherent elastic neutrino-nucleus scattering in SNS basement corridor. This is location closest proximity target thus, highest neutrino flux, but it also well shielded from BRN flux by infill concrete gravel....