First nuclear transmutation of 237Np and 241Am by accelerator-driven system at Kyoto University Critical Assembly

Cheol Ho Pyeon; Masao Yamanaka; Akito Oizumi; Masahiro Fukushima; Go Chiba; Kenichi Watanabe; Tomohiro Endo; Wilfred G. Van Rooijen; Kengo Hashimoto; Atsushi Sakon; Naoto Aizawa; Yasutoshi Kuriyama; Tomonori Uesugi; Yoshihiro Ishi

doi:10.1080/00223131.2019.1618406

First nuclear transmutation of ²³⁷Np and ²⁴¹Am by accelerator-driven system at Kyoto University Critical Assembly

Cheol Ho Pyeon, Masao Yamanaka, Akito Oizumi, Masahiro Fukushima, Go Chiba, Kenichi Watanabe, Tomohiro Endo, Wilfred G. Van Rooijen, Kengo Hashimoto, Atsushi Sakon, Naoto Aizawa, Yasutoshi Kuriyama, Tomonori Uesugi, Yoshihiro Ishi

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Abstract

This study demonstrates, for the first time, the principle of nuclear transmutation of minor actinide (MA) by the accelerator-driven system (ADS) through the injection of high-energy neutrons into the subcritical core at the Kyoto University Critical Assembly. The main objective of the experiments is to confirm fission reactions of neptunium-237 (²³⁷Np) and americium-241 (²⁴¹Am), and capture reactions of ²³⁷Np. Subcritical irradiation of ²³⁷Np and ²⁴¹Am foils is conducted in a hard spectrum core with the use of the back-to-back fission chamber that obtains simultaneously two signals from specially installed test (²³⁷Np or ²⁴¹Am) and reference (uranium-235) foils. The first nuclear transmutation of ²³⁷Np and ²⁴¹Am by ADS soundly implemented by combining the subcritical core and the 100 MeV proton accelerator, and the use of a lead-bismuth target, is conclusively demonstrated through the experimental results of fission and capture reaction events.

Original language	English
Pages (from-to)	684-689
Number of pages	6
Journal	journal of nuclear science and technology
Volume	56
Issue number	8
DOIs	https://doi.org/10.1080/00223131.2019.1618406
Publication status	Published - Aug 3 2019
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Nuclear Energy and Engineering

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10.1080/00223131.2019.1618406

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Pyeon, C. H., Yamanaka, M., Oizumi, A., Fukushima, M., Chiba, G., Watanabe, K., Endo, T., Van Rooijen, W. G., Hashimoto, K., Sakon, A., Aizawa, N., Kuriyama, Y., Uesugi, T., & Ishi, Y. (2019). First nuclear transmutation of ²³⁷Np and ²⁴¹Am by accelerator-driven system at Kyoto University Critical Assembly. journal of nuclear science and technology, 56(8), 684-689. https://doi.org/10.1080/00223131.2019.1618406

Pyeon, CH, Yamanaka, M, Oizumi, A, Fukushima, M, Chiba, G, Watanabe, K, Endo, T, Van Rooijen, WG, Hashimoto, K, Sakon, A, Aizawa, N, Kuriyama, Y, Uesugi, T & Ishi, Y 2019, 'First nuclear transmutation of ²³⁷Np and ²⁴¹Am by accelerator-driven system at Kyoto University Critical Assembly', journal of nuclear science and technology, vol. 56, no. 8, pp. 684-689. https://doi.org/10.1080/00223131.2019.1618406

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abstract = "This study demonstrates, for the first time, the principle of nuclear transmutation of minor actinide (MA) by the accelerator-driven system (ADS) through the injection of high-energy neutrons into the subcritical core at the Kyoto University Critical Assembly. The main objective of the experiments is to confirm fission reactions of neptunium-237 (237Np) and americium-241 (241Am), and capture reactions of 237Np. Subcritical irradiation of 237Np and 241Am foils is conducted in a hard spectrum core with the use of the back-to-back fission chamber that obtains simultaneously two signals from specially installed test (237Np or 241Am) and reference (uranium-235) foils. The first nuclear transmutation of 237Np and 241Am by ADS soundly implemented by combining the subcritical core and the 100 MeV proton accelerator, and the use of a lead-bismuth target, is conclusively demonstrated through the experimental results of fission and capture reaction events.",

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doi = "10.1080/00223131.2019.1618406",

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AU - Chiba, Go

AU - Watanabe, Kenichi

AU - Endo, Tomohiro

AU - Van Rooijen, Wilfred G.

AU - Hashimoto, Kengo

AU - Sakon, Atsushi

AU - Aizawa, Naoto

AU - Kuriyama, Yasutoshi

AU - Uesugi, Tomonori

AU - Ishi, Yoshihiro

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AB - This study demonstrates, for the first time, the principle of nuclear transmutation of minor actinide (MA) by the accelerator-driven system (ADS) through the injection of high-energy neutrons into the subcritical core at the Kyoto University Critical Assembly. The main objective of the experiments is to confirm fission reactions of neptunium-237 (237Np) and americium-241 (241Am), and capture reactions of 237Np. Subcritical irradiation of 237Np and 241Am foils is conducted in a hard spectrum core with the use of the back-to-back fission chamber that obtains simultaneously two signals from specially installed test (237Np or 241Am) and reference (uranium-235) foils. The first nuclear transmutation of 237Np and 241Am by ADS soundly implemented by combining the subcritical core and the 100 MeV proton accelerator, and the use of a lead-bismuth target, is conclusively demonstrated through the experimental results of fission and capture reaction events.

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First nuclear transmutation of ²³⁷Np and ²⁴¹Am by accelerator-driven system at Kyoto University Critical Assembly

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