A5010173315- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- Graphite, nuclear technology, radiation studies
- Nuclear Materials and Properties
- Power Line Communications and Noise
- Magnetic confinement fusion research
- Semiconductor Lasers and Optical Devices
- Analytical Chemistry and Sensors
- Fusion materials and technologies
- Photonic and Optical Devices
- Advanced Photonic Communication Systems
- Nuclear physics research studies
- Organic Light-Emitting Diodes Research
- Flexible and Reconfigurable Manufacturing Systems
- Advanced ceramic materials synthesis
- Particle Accelerators and Free-Electron Lasers
- Spacecraft and Cryogenic Technologies
- Silicon Carbide Semiconductor Technologies
- Thermal properties of materials
- Superconducting Materials and Applications
- Corrosion Behavior and Inhibition
- Atomic and Subatomic Physics Research
- Digital Accessibility for Disabilities
- Nuclear and radioactivity studies
Rensselaer Polytechnic Institute
2018-2024
Los Alamos National Laboratory
2018
Total thermal neutron cross section measurements serve as the primary means of validation for scattering kernels, an important quantity transport calculations. In effort to improve quality researchers at Rensselaer Polytechnic Institute (RPI) designed and constructed a polyethylene based cold moderation system enhance flux below 10 meV when coupled with Enhanced Thermal Target (ETT) RPI Gaerttner LINAC. The final design yielded increase in sub-thermal (below meV) by factor 4.5 moderator...
In order to test the performance of new neutron thermal scattering law (TSL) evaluations it is desirable have experimental data that highly sensitive TSL and provides high fidelity information on energy dependent evaluations. Three relevant experiments are discussed including: accurate total cross section measurements, die-away experiments, leakage experiments. The setups results reviewed examples provided for some moderators including polyethylene, Plexiglas, YHx. For preformed thus far,...
The nuclear data group at the RPI Gaerttner LINAC Laboratory uses a 60 MeV pulsed electron to produce short pulses of neutrons and perform cross section other measurements in wide energy range from below 1 meV about 20 MeV. This paper will cover several recent activities that are interest applications. Interest thermal neutron scattering evaluations prompted need for accurate total validation. To improve flux sub-thermal region (below 0.01 eV) cold moderator was designed installed. A...
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...
Accurate modeling of γ-production in neutron capture reactions is critical for many applications including on-proliferation, safeguards and nuclear reactors. To improve this work, the Rensselaer Polytechnic Institute (RPI) 16-segment γ-multiplicity NaI(Tl) detector at Gaerttner Linear Accelerator (LINAC) Center has been upgraded by implementing a digital data acquisition system. The new digitized system records γ-energy deposition distribution each individual detector, values as function...
Yttrium hydride serves as a neutron moderator material that enables compact, high temperature nuclear reactors. However, in order to accurately design and simulate system relying upon yttrium hydride, the fundamental data of must be well understood. Thermal scattering law (TSL) evaluations represent an important aspect thermal can drastically alter multiplication factor system. Therefore, support evaluation validation for researchers at Rensselaer Polytechnic Institute (RPI) performed total...
Validation of the accuracy S( α, β ) thermal scattering law (TSL) evaluations for moderator materials is an important task development high-performance nuclear engineering systems. Many recent neutron have had limited experimental validation. Like other data, validation TSL libraries has historically been by integral criticality benchmarks. While sufficient general study, these benchmarks often sensitivity to tested TSLs, and compounding uncertainties from data can make ambiguous. In some...
54 Fe radiative capture cross section and transmission measurements were conducted at the Rensselaer Polytechnic Institute (RPI) Gaerttner Linear Accelerator (LINAC) Center using an enriched sample in keV energy region. is a constituent of natural iron, which present large variety nuclear grade materials. Therefore, it important to have accurate understanding sections Fe, can be measured experimentally. In time-of-flight LINAC, array four C 6 D detectors surrounded data collected digital...
ENDF File Validation is a process developed to simulate VISION experiments. This method showed significant differences in inelastic spectra compared experimental measurements. Differential data should be incorporated into thermal neutron scattering evaluation ensure accurate TSL files. The Polyethylene Discrepancy Issue has been found and corrected. resulting manual change submitted currently under review.
Although approximate phonon spectra (e.g. Debye model) are sufficient to reproduce integral quantities total INS cross section) in reasonable agreement with the measured data, more accurate needed achieve differential data. SANS component is essential for reproducing scattering section; this case nanodiamonds and other materials where components present (such as porous like nuclear graphite). A format proposal data ENDF or GNDS needed. Therefore, spectrum) measurements necessary process of...
There is a recent revival of thermal scattering evaluation capabilities and there are many new evaluations available in ENDF-8.0 elsewhere. This creates need for experimental validation other than criticality benchmarks. Thermal libraries (TSL) provide information to describe the double differential at different moderator temperatures. For moderators, biggest effect TSL cross section.