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Title: Annual Technical Progress Report

This report describes the results generated during phase 1 of this project. During this phase, the main tools that are used to compute the thermal neutron scattering kernels for graphite, beryllium, beryllium oxide, zirconium hydride, light water, polyethylene were implemented and tested. This includes a modified NJOY/LEAPR code system, the GASKET code, and the ab initio condensed matter codes VASP and PHONON. Thermal neutron scattering kernels were generated for graphite, beryllium, beryllium oxide. In the case of graphite, new phonon spectra were examined. The first is a spectrum based on experiments performed at Oak Ridge National Laboratory in the early seventies, and the second is generated using the ab initio methods. In the case of beryllium, and beryllium oxide, a synthetic approach for generating the phonon spectra was implemented. In addition, significant progress was made on an experiment to benchmark the graphite scattering kernels was made. The simulations of this experiment show that differences on the order of a few percent, in Pu-239 detector responses, can be expected due to the use of different scattering kernels. (B204) NOT A FINAL REPORT
Authors:
Publication Date:
OSTI Identifier:
801764
Report Number(s):
DOESF22514APR01
NERI 01-140; TRN: US200306%%406
DOE Contract Number:
FG03-02SF22514
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 2 Oct 2002
Research Org:
North Carolina State University; Oak Ridge National Laboratory; Institute Balseiro (US)
Sponsoring Org:
USDOE Office of Nuclear Energy, Science and Technology (NE) (US)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 22 GENERAL STUDIES OF NUCLEAR REACTORS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BENCHMARKS; BERYLLIUM; BERYLLIUM OXIDES; GASKETS; GRAPHITE; KERNELS; PHONONS; POLYETHYLENES; PROGRESS REPORT; SCATTERING; SPECTRA; THERMAL NEUTRONS; ZIRCONIUM HYDRIDES NEUTRON SCATTERING; THERMAL; SCATTERING LAW; GENERATION IV NUCLEAR REACTOR; SAFETY; SLOWING DOWN; GRAPHITE; BERYLLIUM; BERYLLIUM OXIDE; ZIRCONIUM HYDRIDE; LIGHT WATER; POLYETHYLENE