Measurement and analysis of fission rate distributions of 237Np and 238u in a polyethylene system with a 65 mev neutron source

Tomohiko Iwasaki, Oshimasa Sakuya, Naohiro Hirakawa, Hiroshi Nakashima, Yukio Sakamot, Hiroshi Takada, Susumu Tanaka

研究成果: Article査読

2 被引用数 (Scopus)


Fission rates of 237Np and 238U in a polyethylene (CH2) system were measured with a 65MeV quasi monoenergetic neutron source. Relative fission rate distributions dependent on polyethylene thickness up to about 70 cm were obtained for both nuclides with the experimental error within 7%. The present experiment was analyzed by the NMTC/JAERI code that has been employed for designing accelerator-driven transmutation systems. The fission rates of both 237Np and 238U calculated by the NMTC/JAERI did not agree with the experimental ones. The C/E values for both were about 2.0 at 71.8cm of polyethylene thickness when both experimental and calculated values were normalized to 1.0 at 0.0 cm of polyethylene thickness. A sensitivity analysis of the NMTC/JAERI was performed by changing cross sections and angular distributions of hydrogen and carbon and by employing three options of the intra-nuclear cascade/evaporation calculation of the NMTC/JAERI. The disagreement of the NMTC/JAERI calculation with the experimental values was partially improved by increasing the nonelastic-scattering cross section of carbon and by broadening the elastic-scattering angular distribution of carbon.

ジャーナルjournal of nuclear science and technology
出版ステータスPublished - 1998 3

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学
  • 原子力エネルギーおよび原子力工学


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