Development of Resonance Analysis code for neutron IMaging "RAIM"

中性子イメージング用共鳴解析コードRAIMの開発

長谷美 宏幸   ; 土川 雄介 ; 甲斐 哲也   ; 原田 正英   ; 及川 健一   ; 篠原 武尚   

Hasemi, Hiroyuki; Tsuchikawa, Yusuke; Kai, Tetsuya; Harada, Masahide; Oikawa, Kenichi; Shinohara, Takenao

The densities and temperatures of nuclides in a sample are estimated by analyzing the resonance dips in the neutron transmission spectrum. The observed transmission dips are represented as the convolution of the theoretical resonance dip and the temporal distribution of neutrons emitted from the moderator (i.e., the pulse function). The pulse shapes need to be given around arbitrary energies of resonance dips to perform the neutron resonance transmission analysis (NRTA) and the neutron resonance transmission imaging (NRTI). Therefore, we have found that the Cole-Windsor function well reproduces the pulse function of the BL10 NOBORU at MLF and applied it to the resonance analysis code REFIT, resulting in successfully analyzing the resonance dips in the neutron transmission spectrum measure in NOBORU [1]. However, we were concerned that the modification of REFIT, initially developed for cross section measurements, for NRTA/NRTI analysis might cause serious difficulties in future development due to the difference in purposes. Therefore, we have developed the Resonance Analysis code for neutron IMaging "RAIM".