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Measurements of the 32S(n,p)32P and 35Cl(n,α)32P reaction cross sections in the energy range of 13.3–14.9 MeV and their integral test below 14 MeV

Yuriy M. Verzilov, Fujio Maekawa, Yukio Oyama, Yujiro Ikeda1997年Fusion Engineering and DesignIF 1.7出版社

AbstractThe reaction cross sections of 32S(n,p)32P and 35Cl(n,α)32P were measured in the energy range 13.3–14.9 MeV using the D-T neutron source of the FNS (Fusion Neutron Source) facility. The activation technique, in combination with the Cherenkov radiation counting of 32P activity in aqueous solution, was employed. The cross sections were determined relative to the 93Nb(n,2n)92mNb cross section. The obtained data were compared with latest evaluations as well as with experimental data in the literature. An integral experiment was performed in order to verify the cross sections for the 32S(n,p)32P and 32Cl(n,α)32P reactions in the following comprehensive activation libraries: JENDL Activation File, ADL-3T, EAF-3.1 and FENDL/A-1.0. Reaction rates for the two reactions were measured in five different neutron fields generated in a beryllium assembly bombarded by D-T neutrons, and the experimental values were compared with those calculated with the four libraries. As a result, it was found that the evaluated cross sections for 32S(n,p)32P in JENDL, EAF and FENDL and those for 35Cl(n,α)32P in EAF and FENDL were valid over the energy range from their threshold energies to 15 MeV while the others were not.

日本語訳

32S(n,p)32Pおよび35Cl(n,α)32Pの反応断面積は、FNS(核融合中性子源)施設のD-T中性子源を用いて、13.3–14.9 MeVのエネルギー範囲で測定された。放射化法が、水溶液中の32P放射能のチェレンコフ放射計数と組み合わせて用いられた。断面積は、93Nb(n,2n)92mNb断面積に対して相対的に決定された。得られたデータは、最新の評価値および文献中の実験データと比較された。包括的な放射化ライブラリであるJENDL Activation File、ADL-3T、EAF-3.1およびFENDL/A-1.0における32S(n,p)32Pおよび35Cl(n,α)32P反応の断面積を検証するために、積分実験が実施された。2つの反応の反応率は、D-T中性子を照射されたベリリウム集合体で生成された5つの異なる中性子場で測定され、実験値は4つのライブラリで計算された値と比較された。その結果、JENDL、EAFおよびFENDLにおける32S(n,p)32Pの評価断面積と、EAFおよびFENDLにおける35Cl(n,α)32Pの評価断面積は、それらの閾エネルギーから15 MeVまでのエネルギー範囲で有効であることが判明したが、他のものは有効ではなかった。

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