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Measurement for thermal neutron capture cross sections and resonance integrals of the $$^{243}$$Am(n,$$gamma$$)$$^{rm 244g}$$Am, $$^{rm 244m+g}$$Am reactions

$$^{243}$$Am(n,$$gamma$$)$$^{rm 244g}$$Am, $$^{rm 244m+g}$$Am反応の熱中性子捕獲断面積、及び共鳴積分の測定

中村 詔司  ; 遠藤 駿典   ; 木村 敦   ; 芝原 雄司*

Nakamura, Shoji; Endo, Shunsuke; Kimura, Atsushi; Shibahara, Yuji*

マイナーアクチノイド核種の一つである$$^{243}$$Amの中性子捕獲反応断面積の精度向上に係る研究開発を行った。まず、崩壊ガンマ線の放出率を高い精度で整備して、$$^{243}$$Amの原子炉中性子照射による$$^{244}$$Amの基底状準位$$^{rm 244g}$$Amの生成量をガンマ線測定で調べた。次に、アイソマーと基底準位を合わせた$$^{rm 244m+g}$$Amの生成量を、$$^{244}$$Cmへ崩壊させてアルファ線測定で調べた。$$^{rm 244g}$$Am生成、及び$$^{rm 244m+g}$$Am生成の熱中性子捕獲断面積、及び共鳴積分を測定した。

Research and development were made for accuracy improvement of neutron capture cross section data on $$^{243}$$Am among minor actinides. First, the emission probabilities of decay $$gamma$$ rays were obtained with high accuracy, and the amount of the ground state of $$^{244}$$Am produced by reactor neutron irradiation of $$^{243}$$Am was examinded by $$gamma$$-ray measurement. Next, the total amount of isomer and ground states was examoned by $$alpha$$-ray measurement.

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