A5077560816- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Nuclear reactor physics and engineering
- Particle physics theoretical and experimental studies
- Numerical methods for differential equations
- Gas Dynamics and Kinetic Theory
- Nuclear Physics and Applications
- Astrophysics and Cosmic Phenomena
- Quantum chaos and dynamical systems
- Meteorological Phenomena and Simulations
- Radiation Detection and Scintillator Technologies
- Gamma-ray bursts and supernovae
- Computational Fluid Dynamics and Aerodynamics
- Nanocluster Synthesis and Applications
- History and advancements in chemistry
- Magnetic confinement fusion research
- Quantum Chromodynamics and Particle Interactions
- Radioactive contamination and transfer
- Machine Learning in Materials Science
- Radioactive element chemistry and processing
- Astro and Planetary Science
- Superconductivity in MgB2 and Alloys
University of Tennessee at Knoxville
2015-2022
Oak Ridge National Laboratory
2015-2018
The Precision Reactor Oscillation and Spectrum Experiment, PROSPECT, is designed to make a precise measurement of the antineutrino spectrum from highly-enriched uranium reactor probe eV-scale sterile neutrinos by searching for neutrino oscillations over meter-long distances. PROSPECT conceived as 2-phase experiment utilizing segmented $^6$Li-doped liquid scintillator detectors both efficient detection antineutrinos through inverse beta decay reaction excellent background discrimination....
Flash-X is a highly composable multiphysics software system that can be used to simulate physical phenomena in several scientific domains. It derives some of its solvers from FLASH, which was first released 2000. has new framework relies on abstractions and asynchronous communications for performance portability across range increasingly heterogeneous hardware platforms. meant primarily solving Eulerian formulations applications with compressible and/or incompressible reactive flows. also...
Current models of antineutrino production in nuclear reactors predict detection rates and spectra at odds with the existing body direct reactor measurements. High-resolution detectors operated close to compact research cores can produce new precision measurements useful testing explanations for these observed discrepancies involving underlying or physics. Absolute measurement 235U-produced spectrum provide additional constraints evaluating accuracy current future models, while relative...
Abstract Neutrino–matter interactions play an important role in core-collapse supernova (CCSN) explosions, as they contribute to both lepton number and/or four-momentum exchange between neutrinos and matter thus act the agent for neutrino-driven explosions. Due multiscale nature of neutrino transport CCSN simulations, implicit treatment neutrino–matter is desired, which requires solutions coupled nonlinear systems each step time integration scheme. In this paper, we design compare iterative...
A meter-long, 23-liter EJ-309 liquid scintillator detector has been constructed to study the light collection and pulse-shape discrimination performance of elongated cells for PROSPECT reactor antineutrino experiment. The magnitude uniformity neutron/gamma power in energy range inverse beta decay products have studied using gamma spontaneous fission calibration sources deployed along cell long axis. We also neutron-gamma abilities differing PMT reflector configurations. Key design features...
The ExaStar project aims to deliver an efficient, versatile, and portable software ecosystem for multi-physics astrophysics simulations run on exascale machines. code suite is a component-based toolkit, built the capabilities of current simulation codes (in particular Flash-X Castro), based massively parallel adaptive mesh refinement framework AMReX. It includes modules hydrodynamics, advanced radiation transport, thermonuclear kinetics, nuclear microphysics. will reach efficiency by...
Abstract We develop implicit-explicit (IMEX) schemes for neutrino transport in a background material the context of two-moment model that evolves angular moments phase-space distribution function. Considering upper and lower bounds are introduced by Pauli’s exclusion principle on moments, an algebraic moment closure based Fermi-Dirac statistics convex-invariant time integrator both demanded. A finite-volume/first-order discontinuous Galerkin(DG) method is used to illustrate how needed...
Abstract Algorithms for neutrino-matter coupling in core-collapse supernovae (CCSNe) are investigated the context of a spectral two-moment model, which is discretized space with discontinuous Galerkin method, integrated time implicit-explicit (IMEX) methods, and implemented toolkit high-order neutrino-radiation hydrodynamics (thornado). The model considers electron neutrinos antineutrinos tabulated opacities from Bruenn (1985), includes neutrino-electron scattering pair processes. nonlinear...
Flash-X is a highly composable multiphysics software system that can be used to simulate physical phenomena in several scientific domains. It derives some of its solvers from FLASH, which was first released 2000. has new framework relies on abstractions and asynchronous communications for performance portability across range increasingly heterogeneous hardware platforms. meant primarily solving Eulerian formulations applications with compressible and/or incompressible reactive flows. also...