JENDL-3.2 covariance file

Keiichi Shibata, Akira Hasegawa, Osamu Iwamoto, Satoshi Chiba, Masayoshi Sugimoto, Naoteru Odano, Toshihiko Kawano, Yutaka NakajimA, Toru Murata, Hiroyuki Matsunobu, Youl Soo Oh, Kenji Yokoyama, Kazuteru Sugino, Makoto Ishikawa, Kazuaki Kosako, Naoki Yamano, Yukinori Kanda

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Covariances of neutron nuclear data have been estimated for 16 nuclides contained in JENDL-3.2. The physical quantities for which covariances are deduced are cross sections, resolved and unresolved resonance parameters, the first order Legendre-polynomial coefficients for the angular distribution of elastically scattered neutrons, and fission neutron spectra. As for 233.235238u and 239241Pu, covariances were obtained also for the average number of neutrons emitted in fission. Least-squares methods were applied to obtain the covariances of those cross sections which were based on experimental data. A simultaneous evaluation method yielded uncertainties in the fission cross sections of 23SU, 238U, 239Pu, 240Pu and 241Pu. Covariances of nuclear model calculations were determined from uncertainties in model parameters. The covariance file thus obtained is processed by a system which has been developed, and used for the adjustment of group cross sections.

Original languageEnglish
Pages (from-to)40-43
Number of pages4
Journaljournal of nuclear science and technology
Publication statusPublished - 2002 Aug
Externally publishedYes


  • Covariance
  • Cross section
  • Fission neutron spectrum
  • JENDL-3.2
  • Legendre coefficient
  • Resonance parameter

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


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