A5005777235- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Astro and Planetary Science
- Planetary Science and Exploration
- Particle Detector Development and Performance
- Nuclear reactor physics and engineering
- Photocathodes and Microchannel Plates
- Radiation Therapy and Dosimetry
- Spacecraft and Cryogenic Technologies
- Particle accelerators and beam dynamics
- Medical Imaging Techniques and Applications
- Isotope Analysis in Ecology
- Cosmology and Gravitation Theories
- CCD and CMOS Imaging Sensors
- Solid-state spectroscopy and crystallography
- Inorganic Chemistry and Materials
- Methane Hydrates and Related Phenomena
- Gamma-ray bursts and supernovae
- Advanced Optical Sensing Technologies
- Traffic and Road Safety
Los Alamos National Laboratory
2012-2023
Government of the United States of America
2023
University of Washington
2008-2020
United States Agency for International Development
2019
Seattle University
2007-2014
San Francisco County Transportation Authority
2012
Los Alamos National Security (United States)
2006
Using a single-phase liquid argon detector with signal yield of 4.85 photoelectrons per keV electronic-equivalent recoil energy (keVee), we measure the scintillation time dependence both electronic and nuclear recoils in down to 5 keVee. We develop two methods pulse shape discrimination distinguish between recoils. one these methods, background- statistics-limited level contamination be $7.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$ 52 110 (keVr) for acceptance $50%$ no...
The scintillation light yield of liquid argon from nuclear recoils relative to electronic has been measured as a function recoil energy 10 keVr up 250 keVr. efficiency, defined the ratio response response, is 0.25 \pm 0.01 + 0.01(correlated) above 20
Cs <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> LiYCl xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> :Ce <sup xmlns:xlink="http://www.w3.org/1999/xlink">3+</sup> (CLYC) is a promising new inorganic scintillator for gamma-ray spectroscopy and thermal neutron detection with the capability pulse-shape discrimination (PSD). We verify scintillation mechanisms responsible optical emission under gamma- neutron-induced excitation by...
The process of modeling pedestrian volume in San Francisco, California, refined the methodology used to develop previous intersection-based models and incorporated variables that were tailored estimate walking activity local urban context. included two main steps. First, manual automated counts taken at a sample 50 study intersections with variety characteristics. A series factor adjustments was applied produce an annual crossings each intersection. Second, log-linear regression identify...
Results are reported from a search for low-multiplicity neutrino bursts in the Sudbury Neutrino Observatory (SNO). Such could indicate detection of nearby core-collapse supernova explosion. The data were taken Phase I (November 1999 - May 2001), when detector was filled with heavy water, and II (July 2001 August 2003), NaCl added to target. blind analysis which potential backgrounds estimated cuts developed eliminate such 90% confidence before examined. maintained greater than 50%...
The neutrino flux from the sun is predicted to have a CNO-cycle contribution as well known $pp$-chain component. Previously, only fluxes ${\ensuremath{\beta}}^{+}$ decays of $^{13}\mathrm{N}$, $^{15}\mathrm{O}$, and $^{17}\mathrm{F}$ been calculated in detail. Another component that has not widely considered electron capture on these nuclei. We calculate number interactions several solar detectors due neutrinos $^{17}\mathrm{F}$, within context standard model. also discuss possible...
Cs <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> LiYCl xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> :Ce <sup xmlns:xlink="http://www.w3.org/1999/xlink">3+</sup> (CLYC) is an inorganic scintillator that has recently garnered attention for its ability to detect and discriminate between gammas thermal neutrons. We investigate several important performance parameters of three different solid state photomultipliers (SSPMs) when...
The third phase of the Sudbury Neutrino Observatory (SNO) experiment added an array 3He proportional counters to detector. purpose this neutral-current detection (NCD) was observe neutrons resulting from solar-neutrino–deuteron interactions. We have developed a detailed simulation current pulses NCD counters, primary neutron capture on through signal-processing electronics. This MC used model alpha-decay background in SNO's third-phase 8B solar-neutrino measurement.
The Space and Endo-Atmospheric Nudet (Nuclear Detonation) Surveillance Experimentation Risk-Reduction (SENSER) project, scheduled to launch geosynchronous orbit in 2019, contains several experimental demonstration systems developed by Los Alamos National Laboratory Sandia Laboratories assess next-generation technologies for space-based national security missions. CLYC experiment SENSER will examine Cs <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
We have implemented cross strip readout microchannel plate detectors in 18 mm active area format including open face (UV/particle) and sealed tube (optical) configurations. These been tested with a field programmable gate array based parallel channel electronics for event encoding which can process high input rates (> 5 MHz) spatial resolution. Using small pore MCPs (6 μm) operated pair, we achieve gains of >5 x 10<sup>5</sup> is sufficient to provide resolution <35 μm FHWM, self...
Novel microchannel plate (MCP) imaging detectors using cross strip (XS) anodes have been developed recently and demonstrated to be capable of position resolution better than ten microns, nanosecond timing accuracy, event rates greater 3 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sup> counts per second. These use charge division centroiding MCP signals directed onto two orthogonal layers sensing anode strips encode position, time,...