Experiment and analysis of neutron spectra in a concrete assembly bombarded by 14-MeV neutrons

Journal Article · Fri Sep 01 00:00:00 EDT 1989 · Nuclear Science and Engineering; (USA)

OSTI ID:6958532

Oishi, K; Ikeda, Y; Maekawa, H; Nakamura, T ^[1]

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1. Japan Atomic Energy Research Institute, Dept. of Nuclear Engineering, Tokai-mura, Naka-gun, Ibaraki-ken (JP)

The neutron spectra in a concrete assembly bombarded by 14-MeV neutrons are measured by aa miniature NE-213 spectrometer and the multifoil activation method. The results obtained are within experimental error. The measured spectra are compared with calculated results obtained using the two-dimensional DOT3.5 transport code with 125-group structure cross-section libraries based on ENDF/B-IV,JENDL-2, and JENDL-3T (the test version of JENDL-3). In the deuterium-tritium neutron peak region, the measured and calculated neutron spectra are in agreement. However,all the calculations overestimate the measurements by 10 to 50% in the mega-eletron-volt region. In a still lower neutron energy range, where the {sup 197}Au(n,{gamma}){sup 198} Au reaction is dominant, discrepancies from {minus} 30 to + 40% are observed. Possible reasons are considered, but none explain the discrepancies.

• OSTI ID: 6958532
• Journal Information: Nuclear Science and Engineering; (USA), Vol. 103:1; ISSN 0029-5639
• Country of Publication: United States
• Language: English

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NEUTRON SPECTRA
REACTOR SAFETY EXPERIMENTS
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ELEMENTARY PARTICLES
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220900* - Nuclear Reactor Technology- Reactor Safety
220100 - Nuclear Reactor Technology- Theory & Calculation
651920 - Nuclear Properties & Reactions
A=190-219
Experimental