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

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


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 languageEnglish
Pages (from-to)684-689
Number of pages6
Journaljournal of nuclear science and technology
Issue number8
Publication statusPublished - 2019 Aug 3


  • 100 MeV protons
  • ADS
  • Am-241
  • KUCA
  • Np-237
  • Pb-Bi target
  • nuclear transmutation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


Dive into the research topics of 'First nuclear transmutation of <sup>237</sup>Np and <sup>241</sup>Am by accelerator-driven system at Kyoto University Critical Assembly'. Together they form a unique fingerprint.

Cite this