A5080371173- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Superconducting Materials and Applications
- Dark Matter and Cosmic Phenomena
- Scientific Research and Discoveries
- Particle accelerators and beam dynamics
- Quantum Chromodynamics and Particle Interactions
- Astrophysics and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- High-Energy Particle Collisions Research
- Advanced NMR Techniques and Applications
- Muon and positron interactions and applications
- Particle Detector Development and Performance
- NMR spectroscopy and applications
- Geomagnetism and Paleomagnetism Studies
- Obesity, Physical Activity, Diet
- Birth, Development, and Health
- Quantum, superfluid, helium dynamics
- Child Nutrition and Water Access
- Advanced Frequency and Time Standards
- Physics of Superconductivity and Magnetism
United States Agency for International Development
2024
Lake Tahoe Community College
2024
Michigan United
2024
University of Michigan–Ann Arbor
2020-2023
Argonne National Laboratory
2015-2021
United States Department of Energy
2015
University of Florida
2009
We present the first results of Fermilab Muon g-2 Experiment for positive muon magnetic anomaly $a_\mu \equiv (g_\mu-2)/2$. The is determined from precision measurements two angular frequencies. Intensity variation high-energy positrons decays directly encodes difference frequency $\omega_a$ between spin-precession and cyclotron frequencies polarized muons in a storage ring. ring field measured using nuclear resonance probes calibrated terms equivalent proton spin precession...
We present a new measurement of the positive muon magnetic anomaly, a_{μ}≡(g_{μ}-2)/2, from Fermilab Muon g-2 Experiment using data collected in 2019 and 2020. have analyzed more than 4 times number positrons decay our previous result 2018 data. The systematic error is reduced by factor 2 due to better running conditions, stable beam, improved knowledge field weighted distribution, ω[over ˜]_{p}^{'}, anomalous precession frequency corrected for beam dynamics effects, ω_{a}. From ratio...
The Muon g-2 Experiment at Fermi National Accelerator Laboratory (FNAL) has measured the muon anomalous precession frequency $ω_a$ to an uncertainty of 434 parts per billion (ppb), statistical, and 56 ppb, systematic, with data collected in four storage ring configurations during its first physics run 2018. When combined a precision measurement magnetic field experiment's ring, determines anomaly $a_μ({\rm FNAL}) = 116\,592\,040(54) \times 10^{-11}$ (0.46 ppm). This article describes...
The Fermi National Accelerator Laboratory has measured the anomalous precession frequency $a^{}_\mu = (g^{}_\mu-2)/2$ of muon to a combined precision 0.46 parts per million with data collected during its first physics run in 2018. This paper documents measurement magnetic field storage ring. is monitored by nuclear resonance systems and calibrated terms equivalent proton spin spherical water sample at 34.7$^\circ$C. weighted distribution resulting $\tilde{\omega}'^{}_p$, denominator ratio...
We present details on a new measurement of the muon magnetic anomaly, $a_\mu = (g_\mu -2)/2$. The result is based positive data taken at Fermilab's Muon Campus during 2019 and 2020 accelerator runs. uses $3.1$ GeV$/c$ polarized muons stored in $7.1$-m-radius storage ring with $1.45$ T uniform field. value $ a_{\mu}$ determined from measured difference between spin precession frequency its cyclotron frequency. This normalized to strength field, using Nuclear Magnetic Resonance (NMR). ratio...
We present a new measurement of the positive muon magnetic anomaly, $a_\mu \equiv (g_\mu - 2)/2$, from Fermilab Muon $g\!-\!2$ Experiment using data collected in 2019 and 2020. have analyzed more than 4 times number positrons decay our previous result 2018 data. The systematic error is reduced by factor 2 due to better running conditions, stable beam, improved knowledge field weighted distribution, $\tilde{\omega}'^{}_p$, anomalous precession frequency corrected for beam dynamics effects,...
We report development of a highly accurate (parts per billion) absolute magnetometer based on $^{3}\mathrm{He}$ NMR. Optical pumping polarizes the spins, long coherence times provide high sensitivity, and electron shell effectively isolates nuclear spin providing accuracy limited only by corrections including materials, sample shape, magnetization. Our was used to confirm calibration, 32 ppb, magnetic-field sensors in recent measurements muon magnetic moment anomaly...
The anomalous magnetic moment of the muon is one most precisely measured quantities in experimental particle physics. Its latest measurement at Brookhaven National Laboratory deviates from Standard Model expectation by approximately 3.5 standard deviations. goal new experiment, E989, now under construction Fermilab, a fourfold improvement precision. Here, we discuss details future and its current status.
The Muon g−2 experiment at Fermilab (E989) aims to measure the anomalous magnetic moment, aμ, of muon with a precision 140 parts-per-billion. This requires precise measurement both spin precession frequency, ωa, muons stored in field 1.45 T, and that terms shielded proton Larmor ω'p. ω'p total systematic uncertainty 70 parts-per-billion involves combination various nuclear resonance (NMR) probes. There are 378 probes mounted fixed locations constantly monitor drifts. A water-based,...
This paper presents the beam dynamics systematic corrections and their uncertainties for Run-1 data set of Fermilab Muon g-2 Experiment. Two to measured muon precession frequency $\omega_a^m$ are associated with well-known effects owing use electrostatic quadrupole (ESQ) vertical focusing in storage ring. An average vertically oriented motional magnetic field is felt by relativistic muons passing transversely through radial electric components created ESQ system. The correction depends on...
We present details of a high-accuracy absolute scalar magnetometer based on pulsed proton NMR. The $B$-field magnitude is determined from the precession frequency spins in cylindrical sample water after accounting for field perturbations probe materials, shape, and other corrections. Features design, testing procedures, corrections necessary qualification as an are described. device was tested at $B = 1.45$\,T but can be modified range exceeding 1--3\,T. used to calibrate NMR magnetometers...
Anthropometric prevalence indicators such as stunting, wasting, and underweight are widely-used population-level tools used to track trends in childhood nutrition. Threats the validity of these data can lead erroneous decision making improper allocation finite resources intended support some world’s most vulnerable populations. It has been demonstrated previously that aggregated rates for be highly sensitive biases presence non-directional measurement errors, but quantitative relationship...
Using a high‐statistics sample of anti‐neutrino charged current quasi‐elastic (CCQE) events, MiniBooNE reports the challenges in measuring parameters within Relativistic Fermi Gas model. As CCQE analysis has been completed MiniBooNE’s neutrino data, particular attention is paid to differences interactions between two running modes.