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Fundamental Nuclear and Particle Physics At Neutron Sources
H. Abele, J. Amaral, W. R. Anthony +121
Fundamental neutron and neutrino physics at neutron sources, combining precision measurements and theory, can probe new physics at energy scales well beyond the highest energies pr…
Measurement of the Free Neutron Lifetime in a Magneto-Gravitational Trap with In Situ Detection
R. Musedinovic, L. S. Blokland, C. B. Cude-Woods +32
Here we publish three years of data for the UCNtau experiment performed at the Los Alamos Ultra Cold Neutron Facility at the Los Alamos Neutron Science Center. These data are in ad…
An experimental search for an explanation of the difference between beam and bottle neutron lifetime measurements
M. F. Blatnik, L. S. Blokland, N. Callahan +32
The past two decades have yielded several new measurements and reanalysis of older measurements of the neutron lifetime. These have led to a 4.4 standard deviation discrepancy betw…
Fill and dump measurement of the neutron lifetime using an asymmetric magneto-gravitational trap
C. Cude-Woods, F. M. Gonzalez, E. M. Fries +39
The past two decades have yielded several new measurements and reanalyses of older measurements of the neutron lifetime. These have led to a 4.4 standard deviation discrepancy betw…
Improved neutron lifetime measurement with UCN
F. M. Gonzalez, E. M. Fries, C. Cude-Woods +41
We report an improved measurement of the free neutron lifetime using the UCN apparatus at the Los Alamos Neutron Science Center. We counted a total of approximately $38\…
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…
Measurement of the neutron lifetime using a magneto-gravitational trap
Nathan Callahan
Precision measurements of the free neutron lifetime , when combined with measurements of the axial vector form factor, can be used to test unitarity of the CKM matrix. Non-uni…
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…
Neutron lifetime measurements with the big gravitational trap for ultracold neutrons
A. P. Serebrov, E . A. Kolomensky, A. K. Fomin +14
Neutron lifetime is one of the most important physical constants which determines parameters of the weak interaction and predictions of primordial nucleosynthesis theory. There rem…
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 ,…
Measurement of the neutron lifetime using an asymmetric magneto- gravitational trap and in situ detection
R. W. Pattie, N. B. Callahan, C. Cude-Woods +35
The precise value of the mean neutron lifetime, , plays an important role in nuclear and particle physics and cosmology. It is a key input for predicting the ratio of protons…
Spectroscopy of ultracold neutrons using diffraction by a moving grating
G. V. Kulin, A. I. Frank, S. V. Goryunov +7
Spectra of ultracold neutrons that appeared in experiments on neutron diffraction by a moving grating were measured using the time-of-flight Fourier spectrometer. Diffraction lines…
Scattering cross sections of liquid deuterium for ultracold neutrons: Experimental results and a calculation model
Stefan Döge, Christian Herold, Stefan Müller +7
We present scattering cross sections of ultracold neutrons (UCN) in liquid deuterium at T = 20.6 K, as recently measured by means of a transmission experiment. The…
Measurement of the neutron lifetime with ultra-cold neutrons stored in a magneto-gravitational trap
V. F. Ezhov, A. Z. Andreev, G. Ban +8
We report a new measurement of the neutron lifetime using ultra-cold neutrons stored in a magneto-gravitational trap made of permanent magnets. Neutrons surviving in the trap after…
A measurement of the neutron to 199Hg magnetic moment ratio
S. Afach, C. A. Baker, G. Ban +51
The neutron gyromagnetic ratio has been measured relative to that of the 199Hg atom with an uncertainty of 0.8 ppm. We employed an apparatus where ultracold neutrons and mercury at…
New measurements of neutron electric dipole moment
A. P. Serebrov, E. A. Kolomenskiy, A. N. Pirozhkov +14
We report a new measurement of the neutron electric dipole moment with the PNPI EDM spectrometer using the ultracold neutron source PF2 at the research reactor of the ILL. Its firs…
Investigating solid N as a new source of ultra-cold neutrons
D. J. Salvat, E. Gutsmiedl, C. -Y. Liu +4
The dynamical structure factor of solid N in the phase (K) is measured at the IN4 time-of-flight spectrometer at the Institut Laue Langevin, and the potentia…
Measurements of ultracold neutron upscattering and absorption in polyethylene and vanadium
E. I. Sharapov, C. L. Morris, M. Makela +27
The study of neutron cross sections for elements used as efficient ``absorbers'' of ultracold neutrons (UCN) is crucial for many precision experiments in nuclear and particle physi…
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…
A Differential Time-of-flight Spectrometer of Very Slow Neutrons
Yu. N. Pokotilovski, M. I. Novopoltsev, P. Geltenbort +1
A time-of-flight spectrometer of neutrons in the energy range (0.05 -- 2.5)eV is described. This spectrometer has been tested my measuring the total and differential neutron cro…