A5028400040- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Quantum, superfluid, helium dynamics
- Magnetic confinement fusion research
- Dark Matter and Cosmic Phenomena
- Nuclear reactor physics and engineering
- High-pressure geophysics and materials
- High Temperature Alloys and Creep
- Ionosphere and magnetosphere dynamics
- Microstructure and Mechanical Properties of Steels
- Particle physics theoretical and experimental studies
- X-ray Diffraction in Crystallography
- Metal and Thin Film Mechanics
- Particle Detector Development and Performance
- High Entropy Alloys Studies
- Particle accelerators and beam dynamics
- Solar and Space Plasma Dynamics
- Intermetallics and Advanced Alloy Properties
- Particle Accelerators and Free-Electron Lasers
- Neutrino Physics Research
- Additive Manufacturing Materials and Processes
- Nuclear Materials and Properties
- Advanced X-ray Imaging Techniques
- Superconducting Materials and Applications
Oak Ridge National Laboratory
2011-2024
National Technical Information Service
2023
Office of Scientific and Technical Information
2023
University of Tennessee at Knoxville
2015-2020
Fermi National Accelerator Laboratory
2020
Knoxville College
2020
Oregon State University
2011
Aarhus University
2011
University of Wisconsin–Madison
2006-2007
Heriot-Watt University
2001
To achieve chromium tolerance and high performance, a new series of high-entropy perovskites (HEPs) are investigated as cathode materials for solid oxide fuel cells (SOFCs). Multiple rare-earth, alkaline-earth, high-order transition metal elements used the A-site this ABO3 structure. A pure phase is achieved through designed combination different in seven out eight candidates. Due to retaining alkaline-earth Sr and/or Ba, electrical conductivities these HEPs order 100 S/cm at 550-700 °C,...
The violation of Baryon Number, $\mathcal{B}$, is an essential ingredient for the preferential creation matter over antimatter needed to account observed baryon asymmetry in universe. However, such a process has yet be experimentally observed. HIBEAM/NNBAR %experiment program proposed two-stage experiment at European Spallation Source (ESS) search number violation. will include high-sensitivity searches processes that violate by one or two units: free neutron-antineutron oscillation...
The Macromolecular Neutron Diffractometer (MaNDi) is located on beamline 11B of the Spallation Source at Oak Ridge National Laboratory. instrument a neutron time-of-flight wavelength-resolved Laue diffractometer optimized to collect diffraction data from single crystals. has been designed provide flexibility in several instrumental parameters, such as beam divergence and wavelength bandwidth, allow collection range macromolecular systems.
In this work, we show that the well-known lithium-ion anode material, Li4Ti5O12, exhibits exceptionally high initial capacity of 310 mAh g–1 when it is discharged to 0.01 V. It maintains a reversible 230 g–1, far exceeding "theoretical" 175 lithiated composition Li7Ti5O12. Neutron diffraction analyses identify additional Li reversibly enters into Li7Ti5O12 form Li8Ti5O12. density functional theory (DFT) calculations reveal average potentials Li4Ti5O12 step and Li8Ti5O12 are 1.57 0.19 V,...
Beam time at large user-program-based X-ray and neutron scattering facilities is in high demand always a premium. CrystalPlan , highly efficient experiment-planning software, has been developed to maximize the use of available beam per sample experiment. This program can calculate optimize data coverage crystal reciprocal space single-crystal diffraction time-of-flight help user build an experiment plan that will acquire most unique possible, with sufficient but limited redundancy, therefore...
An unexplained >4σ discrepancy persists between "beam" and "bottle" measurements of the neutron lifetime. A new model proposed that conversions neutrons n into mirror n^{'}, part a dark sector, can increase apparent lifetime by 1% via small mass splitting Δm n^{'} inside 4.6 T magnetic field National Institute Standards Technology Beam Lifetime experiment. search for in 6.6 was performed at Spallation Neutron Source which excludes this explanation discrepancy.
Strain hardening in metallic materials delays catastrophic failure at stresses beyond the yield strength by formation of obstacles to dislocation motion during plastic deformation. Conventional measurement instantaneous strain rate originates from load–displacement data acquired uniaxial mechanical testing, rather than evolution obstacles. In order resolve perspective very that cause strengthening, we used an situ neutron diffraction experimental approach determine based upon real-time...
PIONEER is a high Q-resolution, single-crystal, polarized neutron diffractometer at the Second Target Station (STS), Oak Ridge National Laboratory. It will provide unprecedented capability of measuring tiny crystals (0.001 mm3, i.e., x-ray diffraction size), ultra-thin films (10 nm thickness), and weak structural magnetic transitions. benefits from increased peak brightness STS cold-neutron sources uses advanced Montel mirrors that are able to deliver focused beam with brilliance transfer,...
The purpose of this paper is to demonstrate that if the transformation a neutron mirror exists with an oscillation time order 10 seconds, it can be detected in rather simple disappearance and/or regeneration type experiment intense beam cold neutrons. In presence conjectural magnetic field unknown magnitude and direction, resonance conditions found by scanning ordinary range, e.g., $\ifmmode\pm\else\textpm\fi{}100\text{ }\text{ }\ensuremath{\mu}\mathrm{T}$. Magnetic assumed uniform along...
BWAVES is an acronym for Broadband Wide-Angle VElocity Selector spectrometer, indicating that a novel WAVES (Wide-Angle Selector) device will be used to select the velocity/wavelength of detected neutrons after they are scattered by sample. We describe conceptual design BWAVES, time-of-flight broadband inverted-geometry neutron spectrometer Second Target Station at Spallation Neutron Source operated Oak Ridge National Laboratory. Being first inverted geometry where energy can chosen...
Laser-powder bed fusion (L-PBF) has gained significant research interest, not only for its profound advantage of producing near-net shape complex geometries metallic parts, but also the possibility tailored microstructures. Here we exploit capability manipulating crystallographic texture by L-PBF to tailor deformation behavior austenitic stainless steels. In specific, adjusting laser power and scanning speed, textures can be obtained, along uniaxial loading direction in 304L steel samples...
Abstract It is shown that in the two mineral pairs discussed metamorphic grade can be estimated from atomic ratios ( X a = Mg/Mg + Fe 0·175 Mn 0·360 Ca) garnet and b Mg/(Mg Fe) other mineral. The standard error of estimation about one-third temperature range amphibolite facies. Where M on an arbitrary scale, which lower boundary facies at 4·2 upper 5·1, K distribution coefficient — )/( ), then estimating equation 5·6 1·5 log 10 K.
Echocardiographic strain imaging reflects myocardial deformation and is a sensitive measure of cardiac function wall-motion abnormalities. Deep learning (DL) algorithms could automate the interpretation echocardiographic imaging.
The Pegasus Toroidal Experiment was developed to explore the physics limits of plasma operation as aspect ratio (A) approaches unity. Initial experiments on device found that access high normalized current and toroidal beta limited by presence large-scale tearing modes. Major upgrades have been conducted facility provide control tools necessary mitigate these resistive include new programmable power supplies, poloidal field coils increased, time-variable field. First ohmic operations with...
The Oak Ridge National Laboratory is planning to build the Second Target Station (STS) at Spallation Neutron Source (SNS). STS will host a suite of novel instruments that complement First Station's beamline capabilities by offering an increased flux for cold neutrons and broader wavelength bandwidth. A neutron imaging beamline, named Complex, Unique, Powerful Imaging Instrument Dynamics (CUPI2D), among first eight be commissioned as part construction project. CUPI2D designed broad range...
The possibility of relatively fast neutron oscillations into a mirror state is not excluded experimentally when magnetic field considered. Direct searches for the disappearance neutrons in controlled have previously been performed using ultracold neutrons, with some anomalous results reported. We describe technique cold to perform and regeneration search, which would allow us unambiguously identify possible oscillation signal. An experiment existing General Purpose-Small Angle Neutron...
Conversions between neutrons <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>n</a:mi></a:math> and dark matter candidate sterile <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>n</c:mi><c:mo>′</c:mo></c:msup></c:math> have been proposed as a mechanism for baryon number <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mi mathvariant="script">B</e:mi></e:math> violation. In the case that there is small mass...
The energy-dispersive neutron spectra transmitted through single crystals are characterized by sharp Bragg dips at specific wavelengths, where Bragg's law is being fulfilled for certain crystallographic planes. This phenomenon allows developing methods crystal-orientation determination techniques similar to electron backscatter diffraction and X-ray microscopy. work presents a new procedure recover the orientation matrix using transmission recorded during rotation of crystal about an axis...