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$$^{235}$$U中性子核分裂における即発高エネルギー$$gamma$$線スペクトルの測定,2

Measurement of high energy $$gamma$$-ray spectrum accompanied by neutron induced fission of $$^{235}$$U, 2

牧井 宏之; 西尾 勝久; 廣瀬 健太郎; Orlandi, R.; 小川 達彦; Soldner, T.*; Hambsch, F.-J.*; Frost, R.*; Tsekhanovich, I.*; Petrache, C. M.*

Makii, Hiroyuki; Nishio, Katsuhisa; Hirose, Kentaro; Orlandi, R.; Ogawa, Tatsuhiko; Soldner, T.*; Hambsch, F.-J.*; Frost, R.*; Tsekhanovich, I.*; Petrache, C. M.*

福島第一原子力発電所における廃止措置ではデブリとなった核燃料の取出しが計画されているが、体系が未臨界であることを保証しながら作業を進める必要がある。環境からの強いバックグラウンド$$gamma$$線下で核分裂事象の頻度を観測するため、我々は高エネルギー$$gamma$$線に感度を有する未臨界監視検出器を提案している。この未臨界監視検出器開発の基礎データとなる$$^{235}$$U(n,f)反応に伴い発生する高エネルギー$$gamma$$線スペクトル(エネルギー7MeV以上の領域)の測定を仏国ラウエ・ランジュバン研究所(ILL)にある高中性子束炉(HFR)からの大強度冷中性子ビームを用いて行った。発表では取得したデータを解析して得られた結果について報告する。

The Japanese government has a plan to remove the melted reactor fuel for the full deconstruction of Fukushima I Nuclear Power Plants. The removal of the fuel must be carried out without reaching the criticality of the fuel. However, it is quite difficult to monitor the increased fission rate due to the background $$gamma$$-rays from the fission products in the fuel. Here we are proposing to develop a system based on the use of the high energy $$gamma$$-rays accompanied by fission. In order to design the system, it is essential to know the spectrum of prompt fission $$gamma$$-rays up to more than 7 MeV for $$^{235}$$U(n,f) reaction. However, no data are available in the $$gamma$$-ray energy range larger than 7 MeV. This prompted us to make a new measurement to extend the known prompt $$gamma$$-ray energy spectrum up to 20 MeV. The measurement has been carried out at the PF1b beam line of the Institut Laue-Langevin. In this contribution, we will present the results obtained the measurement.

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