B. Plaster
A5069015943- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Nuclear Physics and Applications
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Quantum, superfluid, helium dynamics
- Advanced NMR Techniques and Applications
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Quantum and Classical Electrodynamics
- Scientific Research and Discoveries
- Nuclear physics research studies
- Relativity and Gravitational Theory
- Radiation Detection and Scintillator Technologies
- High-Energy Particle Collisions Research
- Muon and positron interactions and applications
- Particle Detector Development and Performance
- High-pressure geophysics and materials
- Computational Physics and Python Applications
- Atomic and Molecular Physics
- Algebraic and Geometric Analysis
- Electrostatics and Colloid Interactions
- Non-Destructive Testing Techniques
- Magnetic confinement fusion research
Kentucky Department of Education
2024
University of Kentucky
2016-2023
Los Alamos National Laboratory
2019
Massachusetts Institute of Technology
2003-2006
California Institute of Technology
2006
University of Maryland, College Park
2005
We report on a measurement of the parity-violating asymmetry in scattering longitudinally polarized electrons unpolarized protons at Q2 0.230 (GeV/c)(2) and angle theta (e) = 30 degrees - 40 degrees. Using large acceptance fast PbF2 calorimeter with solid delta omega 0.62 sr, A4 experiment is first parity violation to count individual events. The measured A(phys)=(-5.44+/-0.54(stat)+/-0.26(sys))x10(-6). standard model expectation assuming no strangeness contributions vector form factors A(0)...
We report on a measurement of the parity violating asymmetry in elastic scattering polarized electrons off unpolarized protons with A4 apparatus at MAMI Mainz four momentum transfer value Q(2)=0.108 (GeV/c)(2) and forward electron angle 30 degrees <theta(e)<40 . The measured is A(LR)(e-->p)=[-1.36+/-0.29(stat)+/-0.13(syst)]x10(-6). expectation from standard model assuming no strangeness contribution to vector current A(0)=(-2.06+/-0.14)x10(-6). have improved statistical accuracy by factor 3...
We report new measurements of the ratio electric form factor to magnetic neutron, G(n)(E)/G(n)(M), obtained via recoil polarimetry from quasielastic 2H(e-->,e(')n-->)1H reaction at Q2 values 0.45, 1.13, and 1.45 (GeV/c)(2) with relative statistical uncertainties 7.6% 8.4% two higher points, which points have never been achieved in polarization measurements.
We report on a new measurement of the parity-violating asymmetry in quasielastic electron scattering from deuteron at backward angles Q2=0.038 (GeV/c)2. This quantity provides determination neutral weak axial vector form factor nucleon, which can potentially receive large electroweak corrections. The measured A=-3.51+/-0.57 (stat)+/-0.58 (syst) ppm is consistent with theoretical predictions. also updated results previous experiment Q2=0.091 (GeV/c)2, are
We report values for the neutron electric to magnetic form factor ratio, ${G}_{\mathit{En}}/{G}_{\mathit{Mn}}$, deduced from measurements of neutron's recoil polarization in quasielastic $^{2}\mathrm{H}$$(\stackrel{\ensuremath{\rightarrow}}{e},{e}^{'}\stackrel{\ensuremath{\rightarrow}}{n})$$^{1}\mathrm{H}$ reaction, at three ${Q}^{2}$ 0.45, 1.13, and 1.45 (GeV/c)${}^{2}$. The data ${Q}^{2}=1.13$ (GeV/c)${}^{2}$ are first direct experimental ${G}_{\mathit{En}}$ employing degrees freedom...
Static electric dipole moments of nondegenerate systems probe mass scales for physics beyond the Standard Model well those reached directly at high energy colliders. Discrimination between different models, however, requires complementary searches in atomic-molecular-and-optical, nuclear and particle physics. In this report, we discuss current status prospects near future a compelling suite such experiments, along with developments needed encompassing theoretical framework.
Received 10 November 2010DOI:https://doi.org/10.1103/PhysRevLett.105.219903© 2010 The American Physical Society
A new boron-coated CCD camera is described for direct detection of ultracold neutrons (UCN) through the capture reactions $^{10}$B (n,$\alpha$0$\gamma$)$^7$Li (6%) and $^{10}$B(n,$\alpha$1$\gamma$)$^7$Li (94%). The experiments, which extend earlier works using a ZnS:Ag scintillator, are based on detections neutron-capture byproducts in silicon. high position resolution, energy resolution particle ID performance scientific allows observation identification all $\alpha$, $^7$Li $\gamma$...
Two prominent efforts aimed at probing beyond Standard Model physics, searches for a neutron electric dipole moment (EDM) and measurements of the muon $g-2$ anomalous magnetic moment, employ spin precession techniques. In most recent EDM experiment, frequency shifts induced by field gradients $\mathbf{E} \times \mathbf{v}$ motional fields were significant source systematic error. We consider possibility similar effect in find that such an could potentially be as large $\sim 1$ ppm fractional...
The ratio of the electric to magnetic form factor neutron, G_En/G_Mn, was measured via recoil polarimetry from quasielastic d({pol-e},e'{pol-n)p reaction at three values Q^2 [viz., 0.45, 1.15 and 1.47 (GeV/c)^2] in Hall C Thomas Jefferson National Accelerator Facility. Preliminary data indicate that G_En follows Galster parameterization up = (GeV/c)^2 appears rise above (GeV/c)^2.
A relativistic particle undergoing successive boosts which are non collinear will experience a rotation of its coordinate axes with respect to the boosted frame. This is caused by phenomenon called Thomas Rotation. We assess importance in calculation physical quantities like electromagnetic fields regime. calculate field tensor for general three dimensional particle's rest frame as well laboratory then compare tensors obtained direct boost $\vec{\beta} + \delta \vec{\beta}$ and $\vec{\beta}$...
Abstract A relativistic particle undergoing successive boosts which are non collinear will experience a rotation of its coordinate axes with respect to the boosted frame. This is caused by phenomenon called Thomas Rotation. We assess importance in calculation physical quantities like electromagnetic fields regime. calculate field tensor for general three dimensional particle’s rest frame as well laboratory then compare tensors obtained direct boost $$\overrightarrow{\beta }+\delta...
The Jefferson Laboratory E93‐038 collaboration conducted measurements of the ratio electric form factor to magnetic neutron, GEn/GMn, via recoil polarimetry from quasielastic 2H(e⃗,e′n⃗)1H reaction at three values Q2 [viz., 0.45, 1.15, and 1.47 (GeV/c)2] in Hall C Thomas National Accelerator Facility. preliminary results for GEn = 0.45 1.15 (GeV/c)2 are consistent with Galster parameterization; however, result lies slightly above parameterization.