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We collaborated on tests at the Insitut Laue Langevin (ILL) to study the effects of high flux neutron beams on spin-exchange optical pumping (SEOP). The key
We continue to work improving techniques in fast neutron detection using segmented spectrometers based on the principle of capture-gating. Our approach employs
Neutron detectors based on UV scintillations in xenon gas are under development for a variety of applications. The scintillations are produced with high
The detection of low energy charged particles is essential to high precision fundamental physics experiments, particularly with neutron beta decay. The majority
The capabilities of many neutron scattering instruments would be greatly enhanced by neutron polarization analyzers that can cover a wide angular range.
Operation of the second neutron radiative decay experiment was completed. In the experiment we observed the emission of photons that accompany neutron beta
The Alpha-Gamma device is a totally-absorbing neutron detector that has been used to measure the absolute neutron fluence of a cold, monoenergetic neutron beam
NIST continues to be deeply involved with measurements and evaluations of neutron cross section standards. NIST maintains a limited experimental effort focused
NIST maintains the Californium Neutron irradiation Facility (CNIF), which is an exposure facility providing fast neutrons for irradiations requiring high
NIST provides the national reference for the calibration of neutron radiation detectors used for personnel protection and for neutron personnel dosimeters.
The neutron source calibration facility operated by NIST is a world-class calibration laboratory providing neutron source calibration services for radioisotopic
A second Manganese Sulfate Bath is in service. It is smaller than our large bath and it is portable. The former feature allows it to measure the emission rate
In collaboration with Sandia National Laboratories, electric fields have been imaged using neutrons on the NG6e cold neutron imaging beamline. A proof-of
The Neutron Spin Rotation (NSR) collaboration has developed a neutron spin polarimeter that has allowed the precise measurement of spin rotations at a level of
The decay of the free neutron is the simplest nuclear beta decay and is the prototype for all charged current semi-leptonic weak interactions. The decay
We measured the neutron interaction with an atomic field (also known as Schwinger scattering) inside a silicon crystal in order to determine the value of the
The angular correlation between the beta electron and antineutrino in nuclear beta decay, referred to as the “little a” coefficient, is the least well-known of
Neutron beta-decay is the process in which a neutron is transformed into a proton, electron, and electron antineutrino. This process is well described in the
The Precision Reactor Oscillation and Spectrum Experiment, PROSPECT, is the first short-baseline reactor neutrino experiment in the United States since the
Neutron beta-decay is typically considered as a three-body process, but it is always accompanied by inner-bremsstrahlung soft photons, n → e − + p + ν e + γ
The "emiT" experiment searched for time-reversal symmetry violation term in neutron beta decay. It did so by measuring electron-proton coincidence events from
Efficiently managing water transport in proton exchange membrane fuel cells (PEMFCs) is critical to the performance, cost, and durability in order for this
Measuring the through-plane water content in a hydrogen fuel cell is critical to understanding this complicated heat and mass transport environment, where the