J.O. Johnson

Two-neutrino double electron capture of $^{124}$Xe in the first LUX-ZEPLIN exposure

J. Aalbers, D. S. Akerib, A. K. Al Musalhi, Fiona Alder et autres

The broad physics reach of the LUX-ZEPLIN (LZ) experiment covers rare phenomena beyond the direct detection of dark matter. We report precise measurements of the extremely rare decay of $^{124}$Xe through the process of two-neutrino double electron capture (2$ν$2EC), utilizing a $1.39\,\mathrm{kg} …

Enhancing the sensitivity of the LUX-ZEPLIN (LZ) dark matter experiment to low energy signals

D. S. Akerib, A. K. Al Musalhi, S. Alsum, C. S. Amarasinghe et autres

Two-phase xenon detectors, such as that at the core of the forthcoming LZ dark matter experiment, use photomultiplier tubes to sense the primary (S1) and secondary (S2) scintillation signals resulting from particle interactions in their liquid xenon target. This paper describes a …

Environmentally Aware Drones: Automated Impacts Routing (AIR) Embedded into Drone Technology

J.O. Johnson

Archiving Derived Data with the PDS Atmospheres Node: The Educational Labeling System for Atmospheres (ELSA)

L. D. V. Neakrase, Danae Hornung, N. J. Chanover, Lyle Huber et autres

Emission Nebula Discovery in Puppis

J.O. Johnson

A previously undocumented emission nebula in Puppis has been discovered during an amateur astronomer imaging session. Originally discovered on 15 December 2013 by the author, the nebula has since been independently verified in 2015. Additionally, a professional astronomer leading efforts in cataloguing …

Adapting My Weather Impacts Decision Aid (MyWIDA) to Additional Web Application Server Technologies

Jacob C Randall, J.O. Johnson

Abstract : My Weather Impacts Decision Aid (MyWIDA) is a software system that evaluates environmental impacts on air and surface combat systems using weather forecasts. The program ingests forecast data and references combat system environmental thresholds to determine and display the relevant …

ADVANTG—An Automated Variance Reduction Parameter Generator (Rev. 1)

Scott W. Mosher, S. R. Johnson, Aaron M. Bevill, Ahmad M. Ibrahim et autres

The primary objective of ADVANTG is to reduce both the user effort and the computational time required to obtain accurate and precise tally estimates across a broad range of challenging transport applications. ADVANTG has been applied to simulations of real-world radiation shielding, …

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HILO2K: Transport Cross Sections for Neutron Energies to 2 GeV

Franz X. Gallmeier, J.O. Johnson

For neutron energies above 20 MeV, measured doubly differential cross-section data is sparse and most accelerator neutronics calculations are performed using Monte Carlo codes employing high-

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Statistical Analysis of Atmospheric Forecast Model Accuracy - A Focus on Multiple Atmospheric Variables and Location-Based Analysis

J.O. Johnson, John Raby, David I. Knapp

Abstract : Atmospheric effects on commercial and military air platforms are of concern and must be considered for flight planning or military mission execution. Atmospheric models exist that can forecast adverse weather, thus mitigating the impacts on operations. The Weather Research and …

ADVANTG An Automated Variance Reduction Parameter Generator

Scott W. Mosher, USDOE National Nuclear Security Administration (NNSA), Aaron Bevill, Seth Johnson et autres

The AutomateD VAriaNce reducTion Generator (ADVANTG) software automates the generation of variance reduction (VR) parameters for continuous-energy Monte Carlo simulations of fixed-source neutron, photon, and coupled neutron-photon transport problems using MCNP5 (X-5 Monte Carlo Team 2003). ADVANTG generates space- and energy dependent …

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Investigations of active interrogation techniques to detect special nuclear material in maritime environments: Standoff interrogation of small- and medium-sized cargo ships

Thomas Martin Miller, Bruce W. Patton, Brandon R Grogan, James J Henkel et autres

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Investigation of active interrogation techniques to detect special nuclear material in maritime environments: Boarded search of a cargo container ship

Brandon R Grogan, James J Henkel, J.O. Johnson, J.T. Mihalczo et autres

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