A5071022977- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced NMR Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Dark Matter and Cosmic Phenomena
- Nuclear reactor physics and engineering
- Particle physics theoretical and experimental studies
- Earthquake Detection and Analysis
- Electron and X-Ray Spectroscopy Techniques
Tulane University
2017-2024
Los Alamos National Laboratory
2020-2024
National Institute of Standards and Technology
2017-2021
University of Maryland, College Park
2019-2021
NIST Center for Neutron Research
2020-2021
Utah State University
2020-2021
North Carolina State University
2020-2021
California Institute of Technology
2020-2021
Tennessee Technological University
2020-2021
University of Kentucky
2020-2021
We report the first result for electron-antineutrino angular correlation ($a$ coefficient) in free neutron $\ensuremath{\beta}$ decay from aCORN experiment. uses a novel method which $a$ coefficient is proportional to an asymmetry proton time of flight events where electron and recoil are detected delayed coincidence. Data presented 15 month run at NIST Center Neutron Research. obtained...
The aCORN experiment measures the neutron-decay electron-antineutrino correlation ($a$ coefficient) using a novel method based on an asymmetry in proton time-of-flight for events where beta electron and recoil are detected delayed coincidence. We report data analysis result from second run at NIST Center Neutron Research, high-flux cold neutron beam new NG-C guide end position:...
A study of the dead layer thickness and quenching factor a plastic scintillator for use in ultracold neutron (UCN) experiments is described. Alpha spectroscopy was used to determine thin surface be 630 ± 110 nm. The relative light outputs from decay 241Am Compton scattering electrons were extract Birks’ law coefficient, yielding kB value 0.087 0.003 mm/MeV, consistent with some previous reports other polystyrene-based scintillators. results these measurements are incorporated into simulation...
We describe an apparatus used to measure the electron-antineutrino angular correlation coefficient in free neutron decay. The employs a novel measurement technique which is converted into proton time-of-flight asymmetry that counted directly, avoiding need for spectroscopy. Details of method, apparatus, detectors, data acquisition, and reduction scheme are presented, along with discussion important systematic effects.
The aCORN experiment measures the electron-antineutrino correlation $a$ coefficient in free neutron decay. We update previous results [G. Darius et al., Phys. Rev. Lett. 119, 042502 (2017) and M. T. Hassan C 103, 045502 (2021)] to include radiative recoil corrections first order, discuss a key issue comparison of from different $a$-coefficient experimental methods when these effects are considered. corrected combined result is...
A design for a radio frequency (RF) neutron spin flipper obtained from magneto-static and transport simulations is presented. The RF constructed this provides flipping probability of 0.999 or better beam size 6 cm wide 15 high wavelength band between 0.4 0.6 nm. Three permanent magnet guide field sections with air gaps provide linear gradient along the propagation direction over large cross-sectional area. An oscillator based on coupling resonant coil Hartley to excitation was developed,...
Abstract A new instrument, the CANDOR (Chromatic Analysis Neutron Diffractometer or Reflectometer) polychromatic beam reflectometer is being built at National Institute of Standards and Technology Center for Research. will have a capability polarization analysis both specular off-specular scattering, allow measuring magnetic structures thin films with significantly shortened measurement time as compared to conventional monochromatic continuous neutron source. critical component develop 3 He...
The aCORN experiment uses a novel asymmetry method to measure the electron-antineutrino correlation ( -coefficient) in free neutron decay that does not require precision proton spectroscopy. completed two physics runs at NIST Center for Neutron Research. first run on NG-6 beam line obtained result = 0.1090 +/- 0.0030 stat ) 0.0028 (sys), most precise date. second new NG-C high flux promises an improvement ¡ 2%. In addition we show improved measurement of neutrino B can be made using...
An important consideration when designing a magnetostatic cavity for various applications is to maximize the ratio of volume field homogeneity overall size cavity. We report design magnetically shielded solenoid that significantly improves transverse gradient averaged over 1000 cm3 by placing compensation coils around holes in mu-metal end caps rather than conventional which are placed on main solenoid. Our application polarized 3He-based neutron spin filters, and our goal was minimize...
In this paper, we report studies of the Fermi potential and loss per bounce ultracold neutrons (UCNs) on a deuterated scintillator (Eljen-299-02D). These UCN properties enable its use in wide variety applications fundamental neutron research.
Ultracold neutron (UCN) projection imaging is demonstrated using a boron-coated back-illuminated CCD camera and the Los Alamos UCN source. Each recorded through capture reactions with 10B. By direct detection at least one of byproducts α, 7Li γ (electron recoils) derived from reduction thermal noise scientific camera, signal-to-noise improvement on order 104 over indirect has been achieved. Sub-pixel position resolution few microns confirmed for individual events. Projection test objects...
The aCORN experiment uses a novel asymmetry method to measure the electron-antineutrino correlation (a-coefficient) in free neutron decay that does not require precision proton spectroscopy. completed two physics runs at NIST Center for Neutron Research. first run on NG-6 beam line 2013--2014 obtained result = 0.1090 +/- 0.0030 (stat) 0.0028 (sys), total uncertainty of 3.8%. second new NG-C high flux promises an improvement <2%.
The aCORN experiment measures the electron-antineutrino $a$-coefficient in free neutron decay. We update previous results to include radiative and recoil corrections first order, discuss a key issue comparison of from different experimental methods when these effects are considered. corrected combined result is $\overline{a} = -0.10779 \pm 0.00125\, ({\rm stat}) 0.00133\, sys})$, averaged over full Fermi beta spectrum. corresponding for ratio weak coupling constants $\lambda G_A/G_V$ -1.2712...
A study of the dead layer thickness and quenching factor a plastic scintillator for use in ultracold neutron (UCN) experiments is described. Alpha spectroscopy was used to determine thin surface layer, relative light outputs from decay $^{241}$Am Compton scattering electrons were extract parameter. With these characteristics material known, yield can be calculated. The ability make scintillators deuterated, accompanied by its relatively it ideal UCN experiment, where alphas capture are...
In this paper we report studies of the Fermi potential and loss per bounce ultracold neutron (UCN) on a deuterated scintillator (Eljen-299-02D). These UCN properties enables wide variety applications in fundamental research.