Reaction rate analyses for an accelerator-driven system with 14MeV neutrons in the Kyoto university critical assembly

Cheol Ho Pyeon, Hiroshi Shiga, Tsuyoshi Misawa, Tomohiko Iwasaki, Seiji Shiroya

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


Neutron spectrum experiments on the Accelerator-Driven System (ADS) are conducted by combining a critical assembly of a solid-moderated and solid-re.ected core with a Cockcroft-Walton-type accelerator. Neutrons (14 MeV) generated from the accelerator are injected into a subcritical system and the reaction rates are measured by the foil activation method to obtain neutronic spectrum data. The numerical calculations are executed by MCNP-4C3 with JENDL-3.3 and JENDL/D-9 libraries to evaluate the reaction rates of activation foils set in the core center and at the target. In the present study, the measured and calculated (JENDL/D-99) reaction rates in all the activation foils at the target reveal around a di.erence of 10% in C/E values, while a bigger discrepancy between the results of the experiments and the calculations is observed in the center of the core. On the other hand, a special mention is made of the fact that the reaction rate analyses for the neutron spectrum in the subcritical systems demonstrate apparently subcriticality dependence on the C/E values. Based on these results, further improvement is anticipated in the reaction rates obtained by both the experiments and the MCNP-4C3 calculations, as well as in the e.ects of subcriticality and the nuclear data on reaction rate evaluation.

Original languageEnglish
Pages (from-to)965-972
Number of pages8
Journaljournal of nuclear science and technology
Issue number10
Publication statusPublished - 2009 Oct


  • 14 MeV neutrons
  • ADS
  • Foil activation method
  • KUCA
  • MCNP-4C3
  • Neutron spectrum
  • Reaction rate
  • Subcriticality dependence
  • Uncertainty

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


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