Neutron capture cross section measurement of minor actinides in fast neutron energy region for study on nuclear transmutation system

核変換システム開発のための高速中性子エネルギー領域における中性子捕獲断面積測定

片渕 竜也*; 堀 順一*; 岩本 信之  ; 岩本 修  ; 木村 敦   ; 中村 詔司  ; 芝原 雄司*; 寺田 和司*; 登坂 健一*; 遠藤 駿典   ; Rovira, G.*; 児玉 有*; 中野 秀仁*

Katabuchi, Tatsuya*; Hori, Junichi*; Iwamoto, Nobuyuki; Iwamoto, Osamu; Kimura, Atsushi; Nakamura, Shoji; Shibahara, Yuji*; Terada, Kazushi*; Tosaka, Kenichi*; Endo, Shunsuke; Rovira, G.*; Kodama, Yu*; Nakano, Hideto*

A research project entitled "Study on accuracy improvement of fast-neutron capture reaction data of long-lived MAs for development of nuclear transmutation systems" has been ongoing since 2017. The project aims at improving accuracy of neutron capture cross sections of long-lived minor actinides (MAs; Np and Am) in the fast neutron energy region which are very important for development of nuclear transmutation systems. In order to improve the capture reaction data of MAs, measurements using an intense pulsed neutron beam from a spallation neutron source of J-PARC are planned. The project consists of four parts: (1) development of neutron beam filter system, (2) cross section measurement, (3) sample characteristic assay, and (4) theoretical study. The filter system is designed to solve a double bunch issue in J-PARC. The sample characteristic assay lowers systematic uncertainties originating the samples. In the theoretical study, a nuclear reaction model is applied to analyzing cross sections and -ray spectra measured in experiments. The outline of the project and the current progress will be presented.