Measurements of pseudo-decay-constants of trapped neutrons in small graphite systems at 77 and 194.DEG.K.
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概要
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Neutron pulse die-away experiments for small graphite assemblies by using a pulsed "cold" neutron source technique were carried out for the purpose to measure the pseudo-decay-constants of trapped neutrons at the lowest Bragg-peak energy <I>E<SUB>B</SUB></I> of coherent scattering in graphite, and also to estimate the temperature dependence of inelastic. scattering cross section of neutrons at <I>E<SUB>B</SUB></I>. Experiments were carried out for 77 and 194°K graphite systems with dimensions from 40 x 40 x 40 cm<SUP>3</SUP> to 30 x 30 x 20 cm<SUP>3</SUP>.<BR>The experimentally determined pseudo-decay-constants showed distinct temperature dependence and good agreement with the theoretical inelastic scattering cross sections by Young-Koppel model of phonon frequency distribution of graphite at these low temperatures.
- 一般社団法人 日本原子力学会の論文
著者
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Kawakita Takashi
Department Of Aeronautics And Astronautics Kyushu University
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Takahashi Akito
Department Of Nuclear Engineering Graduate School Of Engineering Osaka University
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