Am neutron-induced capture cross section measurement with a large coverage HPGe detector at ANNRI/J-PARC

J-PARC ANNRIでのGe検出器を用いたAmの中性子捕獲断面積の測定

Leong, L.; 木村 敦   ; 中村 詔司  ; 岩本 修  ; 原田 秀郎   

Leong, L.; Kimura, Atsushi; Nakamura, Shoji; Iwamoto, Osamu; Harada, Hideo

Neutron-induced cross sections of Minor Actinides are needed data for neutron-based applications like nuclear reactors. ANNRI is a neutron facility, which delivers neutrons produced by spallation at the MLF/J-PARC. The neutron spectrum of ANNRI spans from thermal to intermediate energies. In addition, due to the high power. It achieves the highest flux of this spectrum compared to other facilities. Therefore, it is a well-suited facility for neutron cross section measurements. Am (n,) cross section was measured at ANNRI using the TOF method. In this experiment, we used HPGe detectors that covered a substantial fraction of the solid angle. Ge detectors can achieve a very high energy resolution. In this work, we focused the analysis on the capture rate to extract the corresponding cross section. We will show how the detection efficiency, the dead time correction, and the background estimation were estimated to derive the capture yield.