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.
BECKER Björn;
KOPECKY Stefan;
HARADA H.;
SCHILLEBEECKX Peter;
2014-05-19
SPRINGER HEIDELBERG
JRC89175
2190-5444,
http://link.springer.com/article/10.1140%2Fepjp%2Fi2014-14058-6,
https://publications.jrc.ec.europa.eu/repository/handle/JRC89175,
10.1140/epjp/i2014-14058-6,
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