Benchmark of Neutron Thermalization in Graphite Using a Pulsed Slowing-Down-Time Experiment

被引：1

作者：

Lee, Eunji ^{[1
]}

Fleming, N. Colby ^{[1
]}

Hawari, Ayman I. ^{[1
]}

机构：

[1] North Carolina State Univ, Dept Nucl Engn, Raleigh, NC 27695 USA

来源：

NUCLEAR SCIENCE AND ENGINEERING | 2023年 / 197卷 / 08期

关键词：

Graphite; benchmark; thermalization; slowing-down-time; ORELA; CROSS-SECTIONS;

D O I：

10.1080/00295639.2022.2162789

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

A benchmark has been developed using a pulsed slowing-down-time experiment to isolate the thermalization process in graphite. The experiment was conducted at the Oak Ridge Electron Linear Accelerator facility at Oak Ridge National Laboratory, and it measured the time spectrum of neutrons leaking from a graphite pile during slowing down and thermalization within graphite. Simulations of the benchmark experiment were performed using the MCNP6.1 Monte Carlo code and the ENDF/B-VII.1 and ENDF/B-VIII.0 cross-section databases. The benchmark provides a time spectrum (i.e., time-dependent counts in a detector) that allows for validation of the graphite thermal scattering libraries (TSLs). The impact on the simulations using a suite of graphite TSLs was compared with the experimental results. Given the density of nuclear graphite, the TSL corresponding to graphite with 30% porosity, as implemented in ENDF/B-VIII.0, was found to most accurately represent the measured time spectrum corresponding to the thermal energy range with an average deviation of +/- 1.7%.

引用

页码：2007 / 2016

页数：10

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