Ayman I. Hawari
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View article: Investigation of spectral emulation for HPGe gamma-ray response generation
Investigation of spectral emulation for HPGe gamma-ray response generation Open
To address high-count-rate conditions in advanced reactor online monitoring, a novel combined simulation-emulation approach is investigated. High count rate dependent gamma-ray spectra are generated using spectral emulation hardware. The p…
View article: The Positron User Facility at the PULSTAR Nuclear Reactor Applications in Materials Studies and Recent Upgrades
The Positron User Facility at the PULSTAR Nuclear Reactor Applications in Materials Studies and Recent Upgrades Open
The PULSTAR nuclear reactor at North Carolina State University is a 1-MWth open-pool reactor and a center for irradiation and examination of materials. Among the different facilities based on this reactor, an intense positron beam facility…
View article: External Moderation of Reactor Core Neutrons for Optimized Production of Ultra-Cold Neutrons
External Moderation of Reactor Core Neutrons for Optimized Production of Ultra-Cold Neutrons Open
The ultra-cold neutron (UCN) source being commissioned at North Carolina State University’s PULSTAR reactor is uniquely optimized for UCN production in the former graphite-filled thermal column outside of the reactor pool. The source utili…
View article: External Moderation of Reactor Core Neutrons for Optimized Production of Ultra-Cold Neutrons
External Moderation of Reactor Core Neutrons for Optimized Production of Ultra-Cold Neutrons Open
The Ultra-Cold Neutron (UCN) source being commissioned at North Carolina State Universityâs PULSTAR reactor is uniquely optimized for UCN production in the former graphite-filled thermal column outside of the reactor pool. The source…
View article: External Moderation of Reactor Core Neutrons for Optimized Production of Ultra-Cold Neutrons
External Moderation of Reactor Core Neutrons for Optimized Production of Ultra-Cold Neutrons Open
The Ultra-Cold Neutron (UCN) source being commissioned at North Carolina State Universityâs PULSTAR reactor is uniquely optimized for UCN production in the former graphite-filled thermal column outside of the reactor pool. The source utili…
View article: Thermal Scattering Law Data Development for Paraffin Wax [Slides]
Thermal Scattering Law Data Development for Paraffin Wax [Slides] Open
Paraffin wax is often used as a nuclear moderator to slow down the fast neutrons in experimental critical assemblies [1]. It is a colorless and soft solid material that consists primarily of straight-chain alkanes (n-alkanes), which are hy…
View article: Evaluation of Thermal Neutron Scattering Cross Section of Uranium Silicide with Ab Initio Lattice Dynamics [Slides]
Evaluation of Thermal Neutron Scattering Cross Section of Uranium Silicide with Ab Initio Lattice Dynamics [Slides] Open
Uranium silicide (U3Si2) is a candidate material for the high-density nuclear fuel in commercial light water reactors [1], [2]. Its higher uranium density, 11.3 g-U/cm3, compared to that of uranium dioxide (UO2), 9.7 g-U/cm3, can improve t…
View article: Second Report of the Nuclear Data Subcommittee of the Nuclear Science Advisory Committee
Second Report of the Nuclear Data Subcommittee of the Nuclear Science Advisory Committee Open
The central importance of the nuclear data curated by the US Nuclear Data Program (USNDP) for clean energy generation, national security, nonproliferation, medical applications, and space exploration as well as basic science was described …
View article: Challenge for the validation of high-fidelity multi-physics LWR modeling and simulation: Development of new experiments in research reactors
Challenge for the validation of high-fidelity multi-physics LWR modeling and simulation: Development of new experiments in research reactors Open
Current approaches to validate multi-physics coupling mainly rely upon experimental data from the operation of the current reactor fleet. These data allow global experimental validation based on Light Water Reactor (LWR) macroscopic physic…
View article: Holistic digital gamma-ray spectroscopy methods and instrumentation for high-throughput high-resolution applications
Holistic digital gamma-ray spectroscopy methods and instrumentation for high-throughput high-resolution applications Open
Method of real-time adaptive digital pulse signal processing for high count rate gamma-ray spectroscopy applications includes receiving a preamplifier signal at a pulse deconvolver, the preamplifier signal including resolution deterioratio…
View article: Ab Initio Evaluation of Uranium Carbide<i>S</i>(<i>α</i>,<i>β</i>) and Thermal Neutron Cross Sections
Ab Initio Evaluation of Uranium Carbide<i>S</i>(<i>α</i>,<i>β</i>) and Thermal Neutron Cross Sections Open
Uranium Carbide (UC) is a nuclear fuel material which offers better neutron economy and lower fuel-cycle costs compared to conventional mixed-oxide fuels. UC’s lattice binding and dynamical properties impact thermal neutron scattering and …
View article: Effects of Hydrogen Bonding on Nuclear Data Development of Liquid Anhydrous HF
Effects of Hydrogen Bonding on Nuclear Data Development of Liquid Anhydrous HF Open
Anhydrous Hydrogen Fluoride (HF) at high temperatures and pressures is used to process and manufacture nuclear fuel. As HF is often used directly with uranium, correct neutron thermal scattering cross sections are crucial to criticality sa…
View article: Effects of Hydrogen Bonding on Nuclear Data Development of Liquid Anhydrous HF
Effects of Hydrogen Bonding on Nuclear Data Development of Liquid Anhydrous HF Open
Anhydrous Hydrogen Fluoride (HF) at high temperatures and pressures is used to process and manufacture nuclear fuel. As HF is often used directly with uranium, correct neutron thermal scattering cross sections are crucial to criticality sa…
View article: Evaluation of Thermal Neutron Scattering Law and Cross Sections for Calcium Hydride
Evaluation of Thermal Neutron Scattering Law and Cross Sections for Calcium Hydride Open
Presented here are the calculated thermal scattering law (TSL) and thermal neutron scattering cross sections for Calcium Hydride, hereafter referred to by its chemical symbol CaH2. The only other such data prior to this evaluation are ther…
View article: <i>FLASSH</i> 1.0: Thermal Scattering Law Evaluation and Cross Section Generation
<i>FLASSH</i> 1.0: Thermal Scattering Law Evaluation and Cross Section Generation Open
The Full Law Analysis Scattering System Hub ( FLASSH ) is an advanced code which evaluates the thermal scattering law (i.e. TSL, S(α,β)) for thermal scattering cross sections and resonance Doppler broadening. The ability to accurately capt…
View article: TSL Nuclear Fuel Evaluations and Capabilities at NC State University [Slides]
TSL Nuclear Fuel Evaluations and Capabilities at NC State University [Slides] Open
This presentation discusses the purpose of this project which is to provide thermal scattering law (TSL) and cross section data to support advanced reactor modeling and criticality safety. The presentation also examines modeling and simula…
View article: Neural Thermal Scattering (NeTS) Modules for Graphite & Beryllium [Slides]
Neural Thermal Scattering (NeTS) Modules for Graphite & Beryllium [Slides] Open
This presentation discusses the motivations behind the project, which include facilitating compact formulation for TSL data, extending AI knowledge, and providing advanced reactor simulation framework. It also discusses how the project acc…
View article: Implementation of TSL Evaluations Beyond the Incoherent Approximation [Slides]
Implementation of TSL Evaluations Beyond the Incoherent Approximation [Slides] Open
This presentation discusses the motivation behind the project, which is to facilitate the production of TSL libraries that contain high fidelity physics including coherent inelastic effects, such as graphite and beryllium. High fidelity TS…
View article: Minutes for the 2021 CSEWG Meeting
Minutes for the 2021 CSEWG Meeting Open
action items from this and past CSEWG meetings. Please take a moment and note any actions for which you or others at your institution may be responsible.
View article: First Report of the Nuclear Data Subcommittee of the Nuclear Science Advisory Committee
First Report of the Nuclear Data Subcommittee of the Nuclear Science Advisory Committee Open
Accurate, reliable nuclear data is essential for the success of Federal missions such as nonproliferation, nuclear forensics, homeland security, national defense, space exploration, clean energy generation, and scientific research. Data ac…
View article: Thermal Neutron Scattering Cross Sections for Graphitic Amorphous Carbon
Thermal Neutron Scattering Cross Sections for Graphitic Amorphous Carbon Open
Carbon materials are commonly found in both nuclear reactors and experimental systems. Various carbon structures occur in nuclear applications ranging from crystalline and nuclear graphite to the amorphous carbon seen in next-generation ad…
View article: Accomplishments of Thermal Neutron Scattering Research at North Carolina State University [Slides]
Accomplishments of Thermal Neutron Scattering Research at North Carolina State University [Slides] Open
Thermal neutron scattering law (TSL) data evaluations have been completed and contributed to ENDF. New evaluations are underway. FLASSH is developing as a modern platform for thermal neutron data analysis featuring an enhanced user experie…
View article: Working Group Report: Baryon Number Violation
Working Group Report: Baryon Number Violation Open
This report, prepared for the Community Planning Study - Snowmass 2013 - summarizes the theoretical motivations and the experimental efforts to search for baryon number violation, focussing on nucleon decay and neutron-antineutron oscillat…
View article: Uranium Carbide and Uranium-Metal Thermal Scattering Law Evaluations and Cross Sections [Slides]
Uranium Carbide and Uranium-Metal Thermal Scattering Law Evaluations and Cross Sections [Slides] Open
New Uranium Carbide and Uranium Metal evaluations have been developed using the FLASSH platform. Ab initio LD/MD models converged electronic, magnetic, and dynamical properties and demonstrate good agreement with experimental data. Thermal…
View article: Structure-Dependent Doppler Broadening Using a Generalized Thermal Scattering Law
Structure-Dependent Doppler Broadening Using a Generalized Thermal Scattering Law Open
The thermal scattering law (TSL), i.e., S(α,β), represents the momentum and energy exchange phase space for a material. The incoherent and coherent components of the TSL correlate an atom’s trajectory with itself and/or with other atoms in…