A5030791445- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Atomic and Molecular Physics
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- Heat Transfer and Optimization
- Silicon Carbide Semiconductor Technologies
- Nuclear physics research studies
- Advanced MRI Techniques and Applications
- Silicon and Solar Cell Technologies
- Advancements in Photolithography Techniques
- Magnetic confinement fusion research
- Induction Heating and Inverter Technology
- Computational Physics and Python Applications
- Scientific Research and Discoveries
- NMR spectroscopy and applications
- Power Systems and Renewable Energy
- Dark Matter and Cosmic Phenomena
- Advanced Data Storage Technologies
- Scientific Measurement and Uncertainty Evaluation
- Physics of Superconductivity and Magnetism
Thomas Jefferson National Accelerator Facility
2007-2024
Triangle Universities Nuclear Laboratory
2011-2020
Duke University
2011-2020
North Carolina Agricultural and Technical State University
2019
The explicit breaking of the axial symmetry by quantum fluctuations gives rise to so-called anomaly. This phenomenon is solely responsible for decay neutral pion π0 into two photons (γγ), leading its unusually short lifetime. We precisely measured width Γ [Formula: see text] process. differential cross sections photoproduction at forward angles were on targets, carbon-12 and silicon-28, yielding text], where stat. denotes statistical uncertainty syst. systematic uncertainty. combined results...
Amphoteric phosphocholine as a family of mild surfactants are widely used in biology due to their phosphate structure related naturally occurring membrane lipids.Changing its hydrophobic part the fluorocarbon counterparts, it was found that interfacial properties exhibit significant differences.Currently, research on fluorinated is limited and lacks types structures.We oxygen atoms specificity our previous works.In this work, kind containing fluoroether chain synthesized, properties, foam...
We develop an approach, by calculating the autocorrelation function of spins, to derive magnetic field gradient-induced transverse (${T}_{2}$) relaxation spins undergoing restricted diffusion. This approach is extension method adopted McGregor. McGregor's solves problem only in fast diffusion limit; however, our yields a single analytical solution suitable all regimes, including intermediate regime. establishes direct connection between well-known slow result Torrey and result. also perform...
We present a summary of recent workshop held at Duke University on Partonic Transverse Momentum in Hadrons: Quark Spin-Orbit Correlations and Quark-Gluon Interactions. The transverse-momentum-dependent parton distribution functions (TMDs), parton-to-hadron fragmentation functions, multi-parton correlation were discussed extensively the workshop. In this paper, we summarize first theoretical issues concerning study partonic structure hadrons future electron-ion collider (EIC) with emphasis...
We propose a new method to detect short-range \textit{P-} and \textit{T-} violating interactions between nucleons, based on measuring the precession frequency shift of polarized $^3$He nuclei in presence an unpolarized mass. To maximize sensitivity, high-pressure cell with thin glass windows (250 $\rm\mu m$) is used minimize distance mass $^3$He. The magnetic field fluctuation suppressed by using gas different region as magnetometer. Systematic uncertainties from properties are flipping both...
The first measurement of the three-body photodisintegration longitudinally polarized (3)He with a circularly γ-ray beam was carried out at High Intensity Source facility located Triangle Universities Nuclear Laboratory. spin-dependent double-differential cross sections and contributions from to Gerasimov-Drell-Hearn integrand are presented compared state-of-the-art calculations incident photon energies 12.8 14.7 MeV. data reveal importance including Coulomb interaction between protons in...
Cooling of hadron beams is critically important in the next generation storage rings for delivery unprecedented performance. One such application electron-ion collider presently under development US. The desire to develop electron coolers operation at much higher energies than previously achieved necessitates use radio-frequency (RF) fields acceleration as opposed conventional, electrostatic approach. While cooling a mature technology low energy utilizing DC beam, RF requires beam be...
We present a complete scheme for managing the polarization of ion beams in Jefferson Lab’s proposed Medium-energy Electron-Ion Collider (MEIC). It provides preservation during all stages beam acceleration and control collider’s experimental straights. discuss characteristic features spin motion accelerators with Siberian snakes figure-8 shape. propose 3D rotators MEIC collider ring. provide calculations rotator deuteron proton beams. The main design are summarized.
The cross section of atomic electron Compton scattering γ+e→γ′+e′ was measured in the 4.400–5.475 GeV photon beam energy region by PrimEx collaboration at Jefferson Lab with an accuracy 2.6% and less. results are consistent theoretical predictions that include next-to-leading order radiative corrections. measurements provide first high precision test this elementary QED process energies greater than 0.1 GeV.
We have observed a linear pressure dependence of longitudinal relaxation time ${T}_{1}$ at 4.2 and 295 K in gaseous $^{3}\mathrm{He}$ cells made either bare Pyrex glass or Cs- Rb-coated due to paramagnetic sites the cell wall. The wall is previously thought be independent pressure. develop model interpret by taking into account diffusion process, our gives good description data.
Provisions are being made in the Electron Ion Collider (EIC) design for future installation of a second Interaction Region (IR), addition to day-one primary IR. The envisioned location IR is existing experi- mental hall at RHIC IP8. It designed work with same beam energy combinations as first IR, covering full range center-of-mass ?20 GeV ?140 GeV. goal complement and improve detection scattered particles magnetic rigidities similar those ion beam. To achieve this, hadron beamline features...
Experimental studies of fundamental structure nucleons require an electron-ion collider a center-of- mass energy up to 90 GeV at luminosity 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">35</sup> cm xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup> s xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> with both beams polarized. A CEBAF-based 9 electrons/positrons and 225 ions is envisioned meet this science need as next step for CEBAF...
The current design of the Medium-energy Electron-Ion Collider (MEIC) project at Jefferson lab features a single 8 GeV/c figure-8 booster based on super-ferric magnets. Reducing circumference by switching to racetrack may improve its performance limiting space charge effect and lower cost. We consider problems preserving proton deuteron polarizations in superconducting booster. show that using magnets hollow high-current NbTi composite cable similar those designed JINR for Nuclotron...
Jefferson Lab Electron Ion Collider (JLEIC) is a figure-8 collider "transparent" to the spin. This allows one control ion polarization using universal 3D spin rotator based on weak solenoids. Besides rotator, coherent effect produced by detector solenoid together with dipole correctors and anti-solenoids compensating betatron oscillation coupling. The 4 m long positioned along straight section of electron ring makes 50 mrad horizontal angle ring. Such large crossing needed for quick...