T. J. Bowles
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View article: Improved limit on the mass of. nu. sub e from the beta decay of molecular tritium
Improved limit on the mass of. nu. sub e from the beta decay of molecular tritium Open
We report a new upper limit of 13.4 eV (95% confidence level) on the mass of the electron antineutrino from a study of the shape of the beta spectrum of free molecular tritium. This result appears to be inconsistent with a reported value f…
View article: Status of the Los Alamos tritium beta decay experiment
Status of the Los Alamos tritium beta decay experiment Open
The Los Alamos tritium experiment employs a gaseous tritium source and a magnetic spectrometer to determine the mass of the electron antineutrino from the shape of the tritium beta spectrum. Since publication of the first result from this …
View article: Neutral-current detection in the Sudbury Neutrino Observatory
Neutral-current detection in the Sudbury Neutrino Observatory Open
The Sudbury Neutrino Observatory (SNO) will have the capability of detecting all active species of neutrinos with energies greater than 2.2 MeV by the neutral-current disintegration of deuterium. The comparison of this rate with the rate o…
View article: Experiment to search for finite mass neutrinos at Los Alamos
Experiment to search for finite mass neutrinos at Los Alamos Open
The strong current interest among physicists of the possibility of finite-mass neutrinos has resulted in several proposals at Los Alamos for experiments to detect nonzero neutrino masses. Three experiments now underway and three proposed e…
View article: Limit on the anti nu/sub e/ mass in free molecular tritium beta decay
Limit on the anti nu/sub e/ mass in free molecular tritium beta decay Open
The question of a nonzero neutrino mass has received considerable attention since the claims of Lyubimov et al in 1980 were published which showed evidence for an electron antineutrino mass between 14 and 46 eV, with a best fit value of 35…
View article: Los Alamos experiment on the beta decay of free molecular tritium
Los Alamos experiment on the beta decay of free molecular tritium Open
The beta spectrum of the decay of free molecular tritium has been accurately measured in order to search for a finite anti nu/sub e/ mass. The betas originating from the decay of free tritium molecules in a differentially pumped source reg…
View article: Fundamental Neutron Physics: a White Paper on Progress and Prospects in the US
Fundamental Neutron Physics: a White Paper on Progress and Prospects in the US Open
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. Significant US efforts are underway that will probe BSM CP viol…
View article: Improved limits on Fierz interference using asymmetry measurements from the Ultracold Neutron Asymmetry (UCNA) experiment
Improved limits on Fierz interference using asymmetry measurements from the Ultracold Neutron Asymmetry (UCNA) experiment Open
The Ultracold Neutron Asymmetry (UCNA) experiment was designed to measure the β-decay asymmetry parameter, A₀, for free neutron decay. In the experiment, polarized ultracold neutrons are transported into a decay trap, and their β-decay ele…
View article: Search for neutron dark decay: <i>n</i> → χ + <i>e</i><sup>+</sup><i>e</i><sup>−</sup>
Search for neutron dark decay: <i>n</i> → χ + <i>e</i><sup>+</sup><i>e</i><sup>−</sup> Open
In January, 2018, Fornal and Grinstein proposed that a previously unobserved neutron decay branch to a dark matter particle (χ) could account for the discrepancy in the neutron lifetime observed in two different types of experiments. One o…
View article: Final results for the neutron <b>β</b>-asymmetry parameter <i>A</i><sub><b>0</b></sub> from the UCNA experiment
Final results for the neutron <b>β</b>-asymmetry parameter <i>A</i><sub><b>0</b></sub> from the UCNA experiment Open
The UCNA experiment was designed to measure the neutron β-asymmetry parameter A 0 using polarized ultracold neutrons (UCN). UCN produced via downscattering in solid deuterium were polarized via transport through a 7 T magnetic field, and t…