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Development of correction methods for the time-of-flight prompt $$gamma$$-ray analysis at ANNRI

ANNRIにおける飛行時間法を用いた即発$$gamma$$線分析のための補正法開発

Huang, M.; 藤 暢輔 ; 海老原 充*; 木村 敦; 中村 詔司

Huang, M.; Toh, Yosuke; Ebihara, Mitsuru*; Kimura, Atsushi; Nakamura, Shoji

The J-PARC Accurate Neutron-Nucleus Reaction measurement Instrument (ANNRI) has been available for the time-of-flight (TOF) prompt $$gamma$$-ray analysis. However, it is not entirely clear on the specific relationship between the number of detected events and the sample weight. In this study, a set of standard Fe and Ag samples were measured to examine the factors which affect the $$gamma$$ counts and TOF counts. It is found that the main contributing factors are live-time ratio of the data acquisition system ($$tau$$), data acquisition efficiency during the live time ($$delta$$), neutron attenuation (NA) and $$gamma$$-ray attenuation (GA). A 5.3-kHz random-pulse generator is used for the determination of $$tau$$. $$delta$$ is calibrated with an empirical formula. Simulation models are built for the evaluations of NA and GA by the PHITS program. With the present method, the values of corrected $$gamma$$ counts are accurately proportional to the sample weights.

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