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11 papers · 1 filter
-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…
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…
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…
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…