A5016106574- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Medical Imaging Techniques and Applications
- Advanced X-ray and CT Imaging
- Advanced X-ray Imaging Techniques
- Astrophysics and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- Radiation Therapy and Dosimetry
- Nuclear reactor physics and engineering
- Advancements in Photolithography Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Electron Microscopy Techniques and Applications
- Advanced Semiconductor Detectors and Materials
- Quantum, superfluid, helium dynamics
- Nuclear Materials and Properties
- Atmospheric Ozone and Climate
- Analog and Mixed-Signal Circuit Design
- Radioactive contamination and transfer
- Graphite, nuclear technology, radiation studies
- Structural Integrity and Reliability Analysis
Oak Ridge National Laboratory
2015-2024
Université Libre de Bruxelles
2024
Chinese Academy of Sciences
2021-2023
Institute of Microelectronics
2021-2023
University of California, Los Angeles
2023
Scuola Internazionale Superiore di Studi Avanzati
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
2021-2022
Office of Scientific and Technical Information
2021
National Technical Information Service
2021
Kurchatov Institute
2020
The coherent elastic scattering of neutrinos off nuclei has eluded detection for four decades, even though its predicted cross section is by far the largest all low-energy neutrino couplings. This mode interaction offers new opportunities to study properties and leads a miniaturization detector size, with potential technological applications. We observed this process at 6.7σ confidence level, using low-background, 14.6-kilogram CsI[Na] scintillator exposed emissions from Spallation Neutron...
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,...
This paper introduces the neutrinoless double-beta decay (the rarest nuclear weak process) and describes status of research for this transition, both from point view theoretical physics in terms present future experimental scenarios. Implications phenomenon on crucial aspects particle are briefly discussed. The calculations matrix elements case mass mechanisms reviewed, a range these quantities is proposed most appealing candidates. After introducing general concepts—such as choice best...
The next-generation Enriched Xenon Observatory (nEXO) is a proposed experiment to search for neutrinoless double beta ($0\nu\beta\beta$) decay in $^{136}$Xe with target half-life sensitivity of approximately $10^{28}$ years using $5\times10^3$ kg isotopically enriched liquid-xenon time projection chamber. This improvement two orders magnitude over current limits obtained by significant increase the mass, monolithic and homogeneous configuration active medium, multi-parameter measurements...
Abstract The nEXO neutrinoless double beta (0 νββ ) decay experiment is designed to use a time projection chamber and 5000 kg of isotopically enriched liquid xenon search for the in 136 Xe. Progress detector design, paired with higher fidelity its simulation an advanced data analysis, based on one used final results EXO-200, produce sensitivity prediction that exceeds half-life 10 28 years. Specifically, improvements have been made understanding production scintillation photons charge as...
The projected performance and detector configuration of nEXO are described in this pre-Conceptual Design Report (pCDR). is a tonne-scale neutrinoless double beta ($0νββ$) decay search $^{136}$Xe, based on the ultra-low background liquid xenon technology validated by EXO-200. With $\simeq$ 5000 kg enriched to 90% isotope 136, has half-life sensitivity approximately $10^{28}$ years. This represents an improvement about two orders magnitude with respect current results. Based experience gained...
The precise measurement of cosmic-ray antinuclei serves as an important means for identifying the nature dark matter and other new astrophysical phenomena, could be used with species to understand production propagation in Galaxy. For instance, low-energy antideuterons would provide a "smoking gun" signature annihilation or decay, essentially free background. Studies recent years have emphasized that models must considered together abundant cosmic antiprotons any potential observation...
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....
Sulfur dioxide (SO2) emissions from volcanic activity have significant impacts on human health, society, aviation, and atmospheric composition in general. While nadir-viewing satellites delivered decades of valuable information the SO2 Vertical Column Density (VCD), accurate retrieval its Layer Height (LH) remains a major challenge, yet critical to further understand events refine estimates emissions, which play key role climate. Indeed, current UV techniques often face limitations...
The Gamma-Ray and AntiMatter Survey (GRAMS) is a next-generation balloon/satellite mission utilizing Liquid Argon Time Projection Chamber (LArTPC) detector to measure both MeV gamma rays antinuclei produced by dark matter annihilation or decay. GRAMS can identify antihelium-3 events based on the measurements of X-rays charged pions from decay exotic atoms, Flight (TOF), energy deposition, stopping range. This paper shows sensitivity estimation using GEANT4 Monte Carlo simulation. For...
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...
We combine the theory of inside-source/inside-detector x-ray fluorescence holography and Kossel lines/x ray standing waves in kinematic approximation to directly obtain phases diffraction structure factors. The influence lines on is also discussed. partial phase determination from experimental data obtaining sign real part factor for several reciprocal lattice vectors a vanadium crystal.
We report on recent accelerator testing of a prototype general antiparticle spectrometer (GAPS). GAPS uses novel approach for indirect dark matter searches that exploits the antideuterons produced in neutralino–neutralino annihilations. captures these into target with subsequent formation exotic atoms. These atoms decay emission x-rays precisely defined energy and correlated pion signature from nuclear annihilation. This uniquely characterizes antideuterons. Preliminary analysis data an...
Progress on a method of barium tagging for the nEXO double beta decay experiment is reported. Absorption and emission spectra deposits atoms ions in solid xenon matrices are presented. Excitation prominent lines, temperature dependence, bleaching fluorescence reveal existence different matrix sites. A regular series sharp lines observed ${\mathrm{Ba}}^{+}$ identified with some type hydride molecule. Lower limits quantum efficiency principal Ba transition Under current conditions, an image...
Future tonne-scale liquefied noble gas detectors depend on efficient light detection in the VUV range. In past years Silicon Photomultipliers (SiPMs) have emerged as a valid alternative to standard photomultiplier tubes or large area avalanche photodiodes. The next generation double beta decay experiment, nEXO, with 5 tonne liquid xenon time projection chamber, will use SiPMs for detecting $178\,\text{nm}$ scintillation light, order achieve an energy resolution of $\sigma / Q_{\beta\beta} =...
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...
Ultrafast radiographic imaging and tracking (U-RadIT) use state-of-the-art ionizing particle light sources to experimentally study sub-nanosecond transients or dynamic processes in physics, chemistry, biology, geology, materials science other fields. These are fundamental modern technologies applications, such as nuclear fusion energy, advanced manufacturing, communication, green transportation, which often involve one mole more atoms elementary particles, thus challenging compute by using...