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20 papers
Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm
D. P. Aguillard, T. Albahri, D. Allspach +188
We present a new measurement of the positive muon magnetic anomaly, , from the Fermilab Muon Experiment using data collected in 2019 and 2020. We ha…
-nuclear-recoil correlation from He decay in a laser trap
P. Müller, Y. Bagdasarova, R. Hong +13
We report the first precise measurement of a -recoil correlation from a radioactive noble gas () confined via a magneto-optical trap. The measurement is motivated by…
High-Accuracy Absolute Magnetometry with Application to the Fermilab Muon Experiment
D. Flay, D. Kawall, T. Chupp +10
We present details of a high-accuracy absolute scalar magnetometer based on pulsed proton NMR. The -field magnitude is determined from the precession frequency of proton spins i…
Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
B. Abi, T. Albahri, S. Al-Kilani +234
We present the first results of the Fermilab Muon g-2 Experiment for the positive muon magnetic anomaly . The anomaly is determined from the precision measurem…
Systematic and Statistical Uncertainties of the Hilbert-Transform Based High-precision FID Frequency Extraction Method
Ran Hong, Simon Corrodi, Saskia Charity +23
Pulsed nuclear magnetic resonance (NMR) is widely used in high-precision magnetic field measurements. The absolute value of the magnetic field is determined from the precession fre…
Design and performance of an in-vacuum, magnetic field mapping system for the Muon g-2 experiment
S. Corrodi, P. De Lurgio, D. Flay +6
The E989 Muon experiment at Fermilab aims to measure the anomalous magnetic moment, , of the muon with a precision of 140 parts-per-billion. This requires a precise m…
Improved limits on Fierz Interference using asymmetry measurements from the UCNA experiment
Xuan Sun, E. Adamek, B. Allgeier +56
The Ultracold Neutron Asymmetry (UCNA) experiment was designed to measure the -decay asymmetry parameter, , for free neutron decay. In the experiment, polarized ultracold n…
Magnetic Field Measurement and Analysis for the Muon g-2 Experiment
Ran Hong
The Muon g-2 Experiment (E989) at Fermilab measures the muon magnetic anomaly, aiming to resolve the greater than 3 discrepancy between the previous measurement and the Standard…
Final results for the neutron -asymmetry parameter from the UCNA experiment
B. Plaster, E. Adamek, B. Allgeier +91
The UCNA experiment was designed to measure the neutron -asymmetry parameter using polarized ultracold neutrons (UCN). UCN produced via downscattering in solid deuterium w…
Experiences from the Commissioning and First Physics Run of the Fermilab Muon g-2 Experiment
Ran Hong
The Muon g-2 Experiment (E989) at Fermilab is seeking to measure the anomalous magnetic moment of muon () with a precision of 140 parts-per-billion (ppb) and aiming to resolve…
Search for dark matter decay of the free neutron from the UCNA experiment: n
X. Sun, E. Adamek, B. Allgeier +57
It has been proposed recently that a previously unobserved neutron decay branch to a dark matter particle () could account for the discrepancy in the neutron lifetime observed i…
New result for the neutron -asymmetry parameter from UCNA
M. A. -P. Brown, E. B. Dees, E. Adamek +56
The neutron -decay asymmetry parameter defines the correlation between the spin of the neutron and the momentum of the emitted electron, which determines $λ=\frac{g_{A}}{g…
First direct constraints on Fierz interference in free neutron decay
K. P. Hickerson, X. Sun, Y. Bagdasarova +40
Precision measurements of free neutron -decay have been used to precisely constrain our understanding of the weak interaction. However the neutron Fierz interference term ,…
Charge-state distribution of Li ions from the decay of laser-trapped He atoms
Ran Hong, Arnaud Leredde, Yelena Bagdasarova +12
Background: The accurate determination of atomic final states following nuclear decay plays an important role in many experiments. In particular, the charge state distributions…
High accuracy position response calibration method for a micro-channel plate ion detector
Ran Hong, Arnaud Leredde, Yelena Bagdasarova +9
We have developed a position response calibration method for a micro-channel plate (MCP) detector with a delay-line anode position readout scheme. Using an {\em in situ} calibratio…
Helicity and nuclear decay correlations
Ran Hong, Matthew G. Sternberg, Alejandro García
We present simple derivations of nuclear -decay correlations with an emphasis on the special role of helicity. This provides a good opportunity to teach students about helicity…
Limits on tensor type weak currents from nuclear and neutron ~decays
Frederik Wauters, Alejandro García, Ran Hong
The limits on time-reversal invariant tensor-type weak currents from nuclear and neutron decays are evaluated including most recent experimental data. We find that $ -0.14 \tim…
Precision Measurement of the Neutron Beta-Decay Asymmetry
M. P. Mendenhall, R. W. Pattie, Y. Bagdasarova +38
A new measurement of the neutron -decay asymmetry has been carried out by the UCNA collaboration using polarized ultracold neutrons (UCN) from the solid deuterium UCN sour…
Weak Interaction Studies with 6He
A. Knecht, Z. T. Alexander, Y. Bagdasarova +17
The 6He nucleus is an ideal candidate to study the weak interaction. To this end we have built a high-intensity source of 6He delivering ~10^10 atoms/s to experiments. Taking full…
Precision Measurement of the 6He Half-Life and the Weak Axial Current in Nuclei
A. Knecht, R. Hong, D. W. Zumwalt +8
Studies of 6He beta decay along with tritium can play an important role in testing ab-initio nuclear wave-function calculations and may allow for fixing low-energy constants in eff…