A5058436567- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Fuel Cells and Related Materials
- Quantum, superfluid, helium dynamics
- Electrocatalysts for Energy Conversion
- High-pressure geophysics and materials
- Advancements in Solid Oxide Fuel Cells
- Advanced X-ray Imaging Techniques
- Membrane-based Ion Separation Techniques
- Nuclear reactor physics and engineering
- Nuclear Materials and Properties
- Cold Atom Physics and Bose-Einstein Condensates
- Radiation Detection and Scintillator Technologies
- Analytical Chemistry and Sensors
- Orbital Angular Momentum in Optics
- Advanced Battery Technologies Research
- Nuclear physics research studies
- Quantum Information and Cryptography
- Conducting polymers and applications
- Quantum and electron transport phenomena
- Advanced Chemical Sensor Technologies
- Quantum Mechanics and Applications
- Mechanical and Optical Resonators
- Crystallography and Radiation Phenomena
- Characterization and Applications of Magnetic Nanoparticles
RMIT University
2019-2021
Tulane University
2020
National Institute of Standards and Technology
2009-2019
Physical Measurement Laboratory
2013-2015
NIST Center for Neutron Research
2000-2015
National Institute of Standards
2006-2009
University of Missouri
1985-2000
Los Alamos National Laboratory
2000
United States Department of Commerce
1999
Laboratoire Aimé Cotton
1997
The phase shift predicted by Aharonov and Casher for a magnetic dipole diffracting around charged electrode has been observed the case of thermal neutrons, using neutron interferometer containing 30-kV/mm vacuum system. judicious use Earth's gravitational field introduces spin-independent which enables unpolarized neutrons to be used. A supplementary bias correct magnitude allows first-order sensitivity achieved; even so, theoretically is only 1.50 mrad geometry conditions experiment. We...
High-resolution neutron radiography was used to image an operating proton exchange membrane fuel cell in situ. The cross-sectional liquid water profile of the quantified as a function temperature, current density, and anode cathode gas feed flow rates. Detailed information obtained on content electrode assembly channels. At low densities, tended remain side cell. Significant channel observed when heat production were moderate, where both diffusion from thermal gradients play significant role...
A proton exchange membrane fuel cell (PEMFC) was imaged using neutron radiography under pseudo steady-state operating conditions to determine the total liquid water content of and distribution across active area as a function temperature, current density, cathode air flow rate. simple cathode-based model formulated rationalize observed dry inlet regions which were most strongly influenced by temperature density. Between temperatures 40 densities 0.5 , outlet gas measured be greater than bulk...
Neutron imaging has been demonstrated to be a powerful tool measure the in situ water content of commercial proton exchange membrane fuel cells (PEMFCs) two and three dimensions. The National Institute Standards Technology neutron facility was designed produce high intensity, highly collimated beam operating cells. details optics detection are discussed terms random uncertainty measuring liquid thickness that is typical PEMFCs.
The physical origin of the dark energy that causes accelerated expansion rate universe is one major open questions cosmology. One set theories postulates existence a self-interacting scalar field for coupling to matter. In chameleon theory, this induces screening mechanism such amplitude nonzero in empty space but greatly suppressed regions terrestrial matter density. However measurements performed under appropriate vacuum conditions can enable appear apparatus, where it be subjected...
The NIST neutron imaging program will build a new instrument in the NCNR guide hall at end of NG-6, beginning operation summer 2015. NG-6 has spectrum that is strongly peaked wavelength 0.5 nm, with fluence rate 2 × 109 cm-2 s-1 before bismuth filter cooled by liquid nitrogen. be developed phased manner and an emphasis on maintaining flexible space to conduct experiments test concepts. In initial phase instrument, available permit flight path about 9 m, provide platform for standard...
The generation and control of neutron orbital angular momentum (OAM) states spin correlated OAM (spin-orbit) provides a powerful probe materials with unique penetrating abilities magnetic sensitivity. We describe techniques to prepare characterize spin-orbit states, provide quantitative comparison known procedures. proposed detection method directly measures the correlations state transverse momentum, overcomes major challenges associated neutrons, which are low flux small spatial coherence...
We use a Mach-Zehnder interferometer to perform neutron holography of spiral phase plate.The object beam passes through plate, acquiring the twist characteristic orbital angular momentum states.The reference fused silica prism, linear gradient.The resulting hologram is fork dislocation image, which could be used reconstruct beams with various momenta.This work paves way for novel applications holography, diffraction and imaging.
We demonstrate a three phase-grating moiré neutron interferometer in highly intense beam as robust candidate for large area interferometry applications and the characterization of materials. This novel far-field technique allows broad wavelength acceptance relaxed requirements related to fabrication alignment, thus circumventing main obstacles associated with perfect crystal interferometry. observed interference fringes an length 4 m examined effects aluminum 6061 alloy sample on coherence...
See also related Comment on "Demonstration of achromatic cold-neutron microscope utilizing axisymmetric focusing mirrors" [Appl. Phys. Lett. 102, 183508 (2013)]
We describe a highly robust method, applicable to both electromagnetic and matter-wave beams, that can produce beam consisting of lattice orbital angular momentum (OAM) states coupled two-level system. also define efficient protocols for controlling manipulating the characteristics. These are applied in an experimental realization optical spin-orbit beams. The novel passive devices we demonstrate here natural alternative existing methods producing single-axis OAM Our techniques provide new...
We propose a method to prepare an entangled spin-orbit state between the spin and orbital angular momenta of neutron wavepacket. This is created by passing neutrons through center quadrupole magnetic field, which provides coupling degrees freedom. A Ramsey fringe type measurement suggested as means verifying correlations.