A5008594558- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- Nuclear Materials and Properties
- Graphite, nuclear technology, radiation studies
- Power Line Communications and Noise
- Spacecraft and Cryogenic Technologies
- Atomic and Subatomic Physics Research
- Analytical Chemistry and Sensors
- High-pressure geophysics and materials
- X-ray Diffraction in Crystallography
- Particle physics theoretical and experimental studies
- Advanced Photonic Communication Systems
- High voltage insulation and dielectric phenomena
- Photonic and Optical Devices
- Recycling and Waste Management Techniques
- Nuclear and radioactivity studies
- Electron and X-Ray Spectroscopy Techniques
- Corrosion Behavior and Inhibition
- Organic Light-Emitting Diodes Research
- Semiconductor Lasers and Optical Devices
- Phase Change Materials Research
- Copper Interconnects and Reliability
- Diamond and Carbon-based Materials Research
- Neutrino Physics Research
Oak Ridge National Laboratory
2020-2024
European Spallation Source
2021-2024
Government of the United States of America
2022
Rensselaer Polytechnic Institute
2018-2021
The violation of Baryon Number, $\mathcal{B}$, is an essential ingredient for the preferential creation matter over antimatter needed to account observed baryon asymmetry in universe. However, such a process has yet be experimentally observed. HIBEAM/NNBAR %experiment program proposed two-stage experiment at European Spallation Source (ESS) search number violation. will include high-sensitivity searches processes that violate by one or two units: free neutron-antineutron oscillation...
In this work we present NJOY+NCrystal, a tool to generate thermal neutron scattering libraries with support for coherent and incoherent elastic components crystalline solid materials. This tool, which is customized version of NJOY, was created by modifying the nuclear data processing program NJOY call software library NCrystal, includes proposed change in ENDF-6 format store both components. Necessary changes enable as well sample it OpenMC Monte Carlo code, are detailed here. Examples...
Abstract The NNBAR experiment for the European Spallation Source will search free neutrons converting to antineutrons with a sensitivity improvement of three orders magnitude compared last such search. This paper describes progress towards conceptual design report NNBAR. moderator, neutron reflector, beamline, shielding and annihilation detector is reported. simulations used form part model which be optimisation quantification its sensitivity.
A key aim of the HighNESS project for European Spallation Source is to enable cutting-edge particle physics experiments. This volume presents a conceptual design report NNBAR experiment. would exploit new cold lower moderator make first search in over thirty years free neutrons converting anti-neutrons. The observation such baryon-number-violating signature be fundamental significance and tackle open questions modern physics, including origin matter-antimatter asymmetry. shows beamline,...
We present recent developments of improved modelling methods for simulating neutron transport in reflector materials interest source applications. These include to be used as traditional reflectors around the moderator, such beryllium, and also novel materials, nanodiamond particles, a very-cold neutrons beam extraction area scattering instrument. Of particular is inclusion physical effects that are not modelled standard thermal libraries Monte-Carlo simulations, extinction beryllium...
The European Spallation Source, currently under construction in Lund, Sweden, is a multidisciplinary international laboratory. Once completed to full specifications, it will operate the world’s most powerful pulsed neutron source. Supported by 3 million Euro Research and Innovation Action within EU Horizon 2020 program, design study (HighNESS) has been develop second source located below spallation target. Compared first source, designed for high cold thermal brightness, new optimized...
The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source focusing on searches for baryon number violation via processes in which neutrons convert to antineutrons. This paper outlines computing and detector simulation framework program. based predictions of neutron flux neutronics together with signal background generation. A range diverse packages are incorporated, including Monte Carlo transport codes, ray-tracing packages, software. common package these...
The European Spallation Source, which is under construction in Lund, Sweden, aims to be the world's brightest source of neutrons. During first phase construction, users will have access a suite 15 instruments, produce neutrons through butterfly-shaped moderator system located above spallation target. HighNESS project, funded by Union Horizon 2020 program, has goal providing new design for second moderator, situated below target and most intense neutron world. provide higher intensity cold,...
With the rise of interest in thermal neutron scattering data for advanced reactor, criticality safety, and shielding applications, new experimental are required evaluation materials or re-evaluation (or validations) previously evaluated materials. New a three-step process: (1) computing phonon characteristics, (2) dynamic structure factor (DSF) from data, (3) using setup to simulate data. All three steps have challenges, ranging need suffciently general material simulation code—a processing...
This paper details and implements a framework for evaluating thermal neutron scattering cross sections that provide S(α,β) data covariance hydrogen in light water. methodology involves perturbing model parameters of molecular dynamics potentials fitting the simulation results to experimental data. The is general can be applied any material or method. fit made using Unified Monte Carlo method experimentally measure double-differential water at Spallation Neutron Source Oak Ridge National...
Ionic liquid materials are viable candidates as a heat transfer fluid (HTF) in wide range of applications, notably within concentrated solar power (CSP) technology and molten salt reactors (MSRs). For next-generation CSP MSR technologies that strive for higher generation efficiency, HTF with phase energy storage capabilities is crucial. Studies have shown eutectic chloride salts exhibit thermal stability at high temperatures, capacity, less expensive than nitrate carbonate salts. However,...
Recently, a cold moderator was designed and developed for use at the Rensselaer Polytechnic Institute Linear Accelerator (RPI LINAC). This proved to easily safely couple an existing neutron producing target, while enhancing flux below 0.02 eV by up factor of 8 cooling polyethylene down 29 K. capability allowed significantly improved counting statistics not previously possible due poor signal background ratio. Additionally, testing performed characterize energy resolution new system found...