Measurement of the direct particle transport through stochastic media using neutron resonance transmission analysis

中性子共鳴透過分析法のための非均一物質中粒子輸送に関する測定研究

Becker, B.*; Kopecky, S.*; 原田 秀郎   ; Schillebeeckx, P.*

Becker, B.*; Kopecky, S.*; Harada, Hideo; Schillebeeckx, P.*

A measurement of the uncollided neutron flux passing through a sample containing a stochastic mixture of tungsten and sulfur grains has been performed using neutron resonance transmission analysis in the 3-200 eV energy region. The impact of the heterogeneous characteristic of the sample is shown based on a comparison of the measurement with a calculated transmission spectrum of a homogeneous sample, which was verified by a measurement with a homogeneous metallic disc. By using a single strong resonance of tungsten, the particle self-shielding factor between 0.2-0.9 was directly measured. The experimental data have been compared with model calculations using the Markovian Levermore-Pomraning model. The measured transmission has been used to determine the effective characteristic chord length and volume fraction of the tungsten grains within the sample.