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Fundamental Neutron Physics: a White Paper on Progress and Prospects in the US
R. Alarcon, A. Aleksandrova, S. Baeßler +88
Fundamental neutron physics, combining precision measurements and theory, probes particle physics at short range with reach well beyond the highest energies probed by the LHC. Sign…
Fundamental Symmetries, Neutrons, and Neutrinos (FSNN): Whitepaper for the 2023 NSAC Long Range Plan
B. Acharya, C. Adams, A. A. Aleksandrova +176
This whitepaper presents the research priorities decided on by attendees of the 2022 Town Meeting for Fundamental Symmetries, Neutrons and Neutrinos, which took place December 13-1…
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…
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…
The neutron electric dipole moment experiment at the Spallation Neutron Source
K. K. H. Leung, M. Ahmed, R. Alarcon +90
Novel experimental techniques are required to make the next big leap in neutron electric dipole moment experimental sensitivity, both in terms of statistics and systematic error co…
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…
Search for the Neutron Decay n X+ where X is a dark matter particle
Z. Tang, M. Blatnik, L. J. Broussard +21
In a recent paper submitted to Physical Review Letters, Fornal and Grinstein have suggested that the discrepancy between two different methods of neutron lifetime measurements, the…
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 ,…
Frequency Shifts Induced by Field Gradients in Muon Experiments
N. Nouri, M. A. Brown, R. Golub +1
Two prominent efforts aimed at probing beyond Standard Model physics, searches for a neutron electric dipole moment (EDM) and measurements of the muon anomalous magnetic mome…
Accessing interior magnetic field vector components in neutron electric dipole moment experiments via exterior measurements, I. Boundary-value techniques
B. Plaster
We propose a new concept for determining the interior magnetic field vector components in neutron electric dipole moment experiments. If a closed three-dimensional boundary surface…
Discovering the New Standard Model: Fundamental Symmetries and Neutrinos
V. Cianciolo, A. B. Balantekin, A. Bernstein +28
This White Paper describes recent progress and future opportunities in the area of fundamental symmetries and neutrinos.
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…
Measurement of the neutron -asymmetry parameter with ultracold neutrons
UCNA Collaboration, B. Plaster, R. Rios +43
We present a detailed report of a measurement of the neutron -asymmetry parameter , the parity-violating angular correlation between the neutron spin and the decay electron…
Impact of motion along the field direction on geometric-phase-induced false electric dipole moment signals
H. Yan, B. Plaster
Geometric-phase-induced false electric dipole moment (EDM) signals, resulting from interference between magnetic field gradients and particle motion in electric fields, have been s…
Determination of the Axial-Vector Weak Coupling Constant with Ultracold Neutrons
UCNA Collaboration, J. Liu, M. P. Mendenhall +37
A precise measurement of the neutron decay -asymmetry has been carried out using polarized ultracold neutrons (UCN) from the pulsed spallation UCN source at the Los Alamos…
First Measurement of the Neutron -Asymmetry with Ultracold Neutrons
R. W. Pattie
We report the first measurement of angular correlation parameters in neutron -decay using polarized ultracold neutrons (UCN). We utilize UCN with energies below about 200 neV, w…
Motional Spin Relaxation in Large Electric Fields
Riccardo Schmid, B. Plaster, B. W. Filippone
We discuss the precession of spin-polarized Ultra Cold Neutrons (UCN) and He atoms in uniform and static magnetic and electric fields and calculate the spin relaxation effect…
A solenoidal electron spectrometer for a precision measurement of the neutron -asymmetry with ultracold neutrons
B. Plaster, R. Carr, B. W. Filippone +7
We describe an electron spectrometer designed for a precision measurement of the neutron -asymmetry with spin-polarized ultracold neutrons. The spectrometer consists of a 1.0-Te…
Measurements of the neutron electric to magnetic form factor ratio GEn/GMn via the ^2H(\vec{e},e'\vec{n})^1H reaction to Q^2 = 1.45 (GeV/c)^2
038 Collaboration, B. Plaster, A. Yu. Semenov
We report values for the neutron electric to magnetic form factor ratio, GEn/GMn, deduced from measurements of the neutron's recoil polarization in the quasielastic 2H(\vec{e},e'\v…
New Measurements and Quantitative Analysis of Electron Backscattering in the Energy Range of Neutron Beta-Decay
J. W. Martin, J. Yuan, M. J. Betancourt +5
We report on the first detailed measurements of electron backscattering from plastic scintillator targets, extending our previous work on beryllium and silicon targets. The scintil…
Evidence for Strange Quark Contributions to the Nucleon's Form Factors at = 0.108 (GeV/c)
F. E. Maas, K. Aulenbacher, S. Baunack +28
We report on a measurement of the parity violating asymmetry in the elastic scattering of polarized electrons off unpolarized protons with the A4 apparatus at MAMI in Mainz at a fo…
Measurement of Strange Quark Contributions to the Nucleon's Form Factors at Q^2=0.230 (GeV/c)^2
A4 Collaboration, F. E. Maas, P. Achenbach +31
We report on a measurement of the parity-violating asymmetry in the scattering of longitudinally polarized electrons on unpolarized protons at a of 0.230 (GeV/c)^2 and a scat…
Parity-violating Electron Deuteron Scattering and the Proton's Neutral Weak Axial Vector Form Factor
SAMPLE collaboration, T. M. Ito
We report on a new measurement of the parity-violating asymmetry in quasielastic electron scattering from the deuteron at backward angles at Q2= 0.038 (GeV/c)2. This quantity provi…