Publications

Mar, 2026

Conference Paper

Development of Nuclear Data Measurements Capabilities at the Spallation Neutron Source

Mar, 2026

Conference Paper

Workshop on Nuclear Data Needs for Nonproliferation

Recently, the National Nuclear Security Agency, Office of Defense Nuclear Nonproliferation Research and Development (DNN R&D) hosted the Nuclear Data Roadmapping and Enhancement Workshop (NDREW). This workshop brought together nuclear data experts, data users, and program leads to discuss nuclear data needs for the nonproliferation mission and to recommend a path forward.…

Dec, 2025

ORNL Report

Resolving the Discontinuity Between Thermal Scattering Data and Fast Data

Jul, 2025

Journal

Porosity in nuclear graphite and its impact on nuclear reactor science and criticality safety applications

Porosity in nuclear-grade graphite significantly influences its low-energy neutron scattering, yet its effect on underlying phonon properties remains debated. This work integrates inelastic and small-angle neutron scattering (INS/SANS) experiments, advanced atomistic simulations with a novel machine-learned potential (DeepMD), total cross-section measurements, and neutroni…

Feb, 2025

Conference Paper

Bayesian optimization of generalized data

Direct application of Bayes' theorem to generalized data yields a posterior probability distribution function (PDF) that is a product of a prior PDF of generalized data and a likelihood function, where generalized data consists of model parameters, measured data, and model defect data. The prior PDF of generalized data is defined by prior expectation values and a prior cov…

Nov, 2024

Conference Paper

Impact of Light Water Covariance on Integral Benchmarks

Mar, 2024

ORNL Report

SCALE Nuclear Data Activities for NRC: Fiscal Year 2023

Dec, 2023

Journal

Reactor Physics Considerations for Use of Yttrium Hydride Moderator

Recent developments in manufacturing large metal hydrides are enabling their use as a moderator for advanced reactor designs. Yttrium hydride (YHx) is particularly attractive for small reactor designs because of its ability to retain a high hydrogen density at elevated temperatures. Design iteration for the Transformational Challenge Reactor (TCR), which uses a YH1.85 mode…

Dec, 2023

Conference Paper

PROGRESS ON 140,142CE NEUTRON CROSS SECTION RESOLVED RESONANCE REGION EVALUATIONS

Oak Ridge National Laboratory is working on completing the resonance parameter evaluation of 140,142Ce in the neutron energy range up to 200 keV. Performed with the support of the US Nuclear Criticality Safety Program, this evaluation aims to generate high-fidelity cerium cross-section and covariance data. A point-wise representation of the cross sections derived from the…

Dec, 2023

Conference Paper

Thermal Neutron Scattering Measurements of YHx for the Transformational Challenge Reactor

Dec, 2023

Journal

Methodology for Generating Covariance Data of Thermal Neutron Scattering Cross Sections

This paper details and implements a framework for evaluating thermal neutron scattering cross sections that provide S(α,β) data and covariance data for hydrogen in light water. This methodology involves perturbing model parameters of molecular dynamics potentials and fitting the simulation results to experimental data. The framework is general and can be applied to any mat…

Dec, 2023

Conference Paper

Discovery of AMPX Thermal Scattering Law Processing Issue for Solid Moderators