Capture cross-section measurement of Am(n,) at J-PARC/MLF/ANNRI

J-PARC/MLF/ANNRIを用いたAm(n,)の中性子捕獲断面積測定

原田 秀郎   ; 太田 雅之; 木村 敦   ; 古高 和禎  ; 廣瀬 健太郎  ; 原 かおる; 金 政浩*; 北谷 文人  ; 小泉 光生 ; 中村 詔司  ; 大島 真澄*; 藤 暢輔   ; 井頭 政之*; 片渕 竜也*; 水本 元治*; 木野 幸一*; 鬼柳 善明*; 藤井 俊行*; 福谷 哲*; 堀 順一*; 高宮 幸一*

Harada, Hideo; Ota, Masayuki; Kimura, Atsushi; Furutaka, Kazuyoshi; Hirose, Kentaro; Hara, Kaoru; Kin, Tadahiro*; Kitatani, Fumito; Koizumi, Mitsuo; Nakamura, Shoji; Oshima, Masumi*; Toh, Yosuke; Igashira, Masayuki*; Katabuchi, Tatsuya*; Mizumoto, Motoharu*; Kino, Koichi*; Kiyanagi, Yoshiaki*; Fujii, Toshiyuki*; Fukutani, Satoshi*; Hori, Junichi*; Takamiya, Koichi*

Accurate determination of the neutron capture cross sections of radioactive nuclei is required in the fields of nuclear waste transmutation study and also nuclear astrophysics. The accurate neutron-nucleus reaction measurement instrument (ANNRI), which was installed in the materials and life science experimental facility (MLF) at the J-PARC, is expected to satisfy these demands. The capture cross section of Am was measured using a high efficiency Ge spectrometer installed in the ANNRI. By taking advantage of its high -ray energy resolution, background components were precisely subtracted. The capture cross section of Am was deduced for a neutron energy region between 0.01 and 20 eV. The obtained cross section and the Westcott factor are compared with the preceding experiments and evaluated values.