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Interim Report on Research between Oak Ridge National Laboratory and Japan Nuclear Cycle Development Institute on Neutron-Capture Cross Sections by Long-Lived Fission Product nuclides

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古高 和禎; 中村 詔司; 原田 秀郎 ; Raman, S.*; Koehler, P. E.*

Furutaka, Kazuyoshi; Nakamura, Shoji; Harada, Hideo; Raman, S.*; Koehler, P. E.*

長寿命核分裂生成核種(LLFP)の中性子捕獲断面積は、放射性廃棄物の変換方法の研究の基礎をなす、重要な値である。三核種のLLFP, 99Tc, 93Zrそして107Pdの熱中性子捕獲断面積を決定するために、反応で放出される即発ガンマ線の既存の測定データの解析を行った。99Tcに対しては、即発ガンマ線から求めた断面積と崩壊$$gamma$$線から求めた断面積とを比較した。93Zrと107Pdに対しては、熱中性子捕獲断面積を初めて実験的に決定した。観測した$$gamma$$線の情報を用い、また既に文献に報告されている情報を活用し、99Tc, 93Zr及び107Pdの準位図を作成した。本研究は、核燃料サイクル機構(JNC)と米国オークリッジ国立研究所(ORNL)との間の共同研究「長寿命核分裂生成核種の中性子捕獲断面積に関する共同研究」の下で行った。

Neutron capture cross sections of long-lived fission products (LLFP) are important quantities as fundamental data for the study of nuclear transmutation of radioactive wastes. Previously obtained thermal-neutron capture $$gamma$$-ray data were analyzed to deduce the partial neutron-capture cross sections of LLFPs including 99Tc, 93Zr, and 107Pd for thermal neutrons. By comparing the decay $$gamma$$-ray data and prompt $$gamma$$-ray data for 99Tc, the relation between the neutron-capture cross section deduced by the two different methods was studied. For the isotopes 93Zr and 107Pd, thermal neutron-capture $$gamma$$-ray production cross sections were deduced for the first time. The level schemes of 99T, 93Zr, and 107Pd have also been constructed from the analyzed data and compared with previously reported levels. This work has been done under the cooperative program "Neutron Capture Cross Sections of Long-Lived Fission Products (LLFPs)" by Japan nuclear cycle development institute (JNC) and Oak Ridge National Laboratory (ORNL).

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