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The Recommended k$$_{0}$$-factors for neutron-induced prompt $$gamma$$-ray analysis and the prompt $$gamma$$-ray emission probabilities

即発$$gamma$$線分析法のための推奨k$$_{0}$$係数及び即発$$gamma$$線放出確率

松江 秀明 ; 米澤 仲四郎

Matsue, Hideaki; Yonezawa, Chushiro

これまでに原研JRR-3Mの冷及び熱中性子ビームで測定された即発$$gamma$$線分析用のk$$_{0}$$係数のうち、中性子スペクトルの影響が無くPGAによる分析が有効な24元素について合計81本のk$$_{0}$$係数の推奨値を統計処理により求めた。得られたk$$_{0}$$係数の推奨値から正確なデータが得られている原子量,同位体存在比,熱中性子断面積を使用し、即発$$gamma$$線放出率のデータを求めた。得られた$$gamma$$線放出率をENSDFと比較した結果、両データの標準偏差はENSDFに近年の測定値が反映されたCaまでの軽元素では$$pm$$10%とよく一致したが、古いデータが含まれる重元素では$$pm$$40%と大きな違いが見られた。

The recommended k$$_{0}$$ factors for 81 $$gamma$$-lines of 24 elements, which are useful for neutron induced prompt $$gamma$$-ray analysis (PGA) and are not influenced by neutron spectrum difference, were obtained from the k$$_{0}$$ factors measured with the cold and thermal guided neutron beams of JRR-3M by statistical calculation. The prompt $$gamma$$-ray emission probabilities were derived from the recommended k$$_{0}$$-factors using atomic weight, isotopic abundance and thermal neutron cross-section of other nuclear constants consisting the k$$_{0}$$ factors, for which one can obtain accurate data. The derived $$gamma$$-ray emission probabilities for the light elements (H to Ca) well agreed within $$pm$$10% with those of the ENSDF, which reflect recent data, which the agreements for heavy elements (Ti to Pb) were $$pm$$40% with those of the ENSDF, which are still composed of old data.

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パーセンタイル:52.68

分野:Chemistry, Analytical

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