Evaluation of delayed neutron data for JENDL-3.3

Tadashi Yoshida, Shigeaki Okajima, Takeshi Sakurai, Ken Nakajima, Tsuyoshi Yamane, Jun Ichi Katakura, Yoshihisa Tahara, Atushi Zukeran, Kazuhiro Oyamatsu, Takaaki Ohsawa, Tsuneo Nakagawa, Takahiro Tachibana

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Delayed neutron data of 235U, 238U and 239Pu have been evaluated and recommended for JENDL-3.3. Adjustment of Vd was carried out on the basis of the ßeff measurements at FCA, MASURCA and TCA using the JENDL-3.2 data as the initial guess. Through this adjustment the vd value for 238U below 3.5 MeV was decreased by about 3% from 0.0481 to 0.0466. The vd values of 235U and 239Pu were also determined in this way. Further appropriate six group constants, the decay constants A¿ and the group yields αi, were determined from experimental data of the delayed neutron emission rates, which were collected and compiled by Spriggs through the SG6 activity of WPEC. Applicability of the resultant group constants was validated through the analyses of the reactivity measurements based on the period or the rod-drop methods.

Original languageEnglish
Pages (from-to)136-139
Number of pages4
JournalJournal of Nuclear Science and Technology
Volume39
DOIs
Publication statusPublished - 2002

Fingerprint

Neutrons
Neutron emission
neutrons
evaluation
adjusting
neutron emission
rods
reactivity
decay

Keywords

  • Beta effective
  • Delayed neutron fraction
  • Delayed neutron spectra
  • Reactivity scale

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering

Cite this

Yoshida, T., Okajima, S., Sakurai, T., Nakajima, K., Yamane, T., Katakura, J. I., ... Tachibana, T. (2002). Evaluation of delayed neutron data for JENDL-3.3. Journal of Nuclear Science and Technology, 39, 136-139. https://doi.org/10.1080/00223131.2002.10875059

Evaluation of delayed neutron data for JENDL-3.3. / Yoshida, Tadashi; Okajima, Shigeaki; Sakurai, Takeshi; Nakajima, Ken; Yamane, Tsuyoshi; Katakura, Jun Ichi; Tahara, Yoshihisa; Zukeran, Atushi; Oyamatsu, Kazuhiro; Ohsawa, Takaaki; Nakagawa, Tsuneo; Tachibana, Takahiro.

In: Journal of Nuclear Science and Technology, Vol. 39, 2002, p. 136-139.

Research output: Contribution to journalArticle

Yoshida, T, Okajima, S, Sakurai, T, Nakajima, K, Yamane, T, Katakura, JI, Tahara, Y, Zukeran, A, Oyamatsu, K, Ohsawa, T, Nakagawa, T & Tachibana, T 2002, 'Evaluation of delayed neutron data for JENDL-3.3', Journal of Nuclear Science and Technology, vol. 39, pp. 136-139. https://doi.org/10.1080/00223131.2002.10875059
Yoshida T, Okajima S, Sakurai T, Nakajima K, Yamane T, Katakura JI et al. Evaluation of delayed neutron data for JENDL-3.3. Journal of Nuclear Science and Technology. 2002;39:136-139. https://doi.org/10.1080/00223131.2002.10875059
Yoshida, Tadashi ; Okajima, Shigeaki ; Sakurai, Takeshi ; Nakajima, Ken ; Yamane, Tsuyoshi ; Katakura, Jun Ichi ; Tahara, Yoshihisa ; Zukeran, Atushi ; Oyamatsu, Kazuhiro ; Ohsawa, Takaaki ; Nakagawa, Tsuneo ; Tachibana, Takahiro. / Evaluation of delayed neutron data for JENDL-3.3. In: Journal of Nuclear Science and Technology. 2002 ; Vol. 39. pp. 136-139.
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AU - Katakura, Jun Ichi

AU - Tahara, Yoshihisa

AU - Zukeran, Atushi

AU - Oyamatsu, Kazuhiro

AU - Ohsawa, Takaaki

AU - Nakagawa, Tsuneo

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AB - Delayed neutron data of 235U, 238U and 239Pu have been evaluated and recommended for JENDL-3.3. Adjustment of Vd was carried out on the basis of the ßeff measurements at FCA, MASURCA and TCA using the JENDL-3.2 data as the initial guess. Through this adjustment the vd value for 238U below 3.5 MeV was decreased by about 3% from 0.0481 to 0.0466. The vd values of 235U and 239Pu were also determined in this way. Further appropriate six group constants, the decay constants A¿ and the group yields αi, were determined from experimental data of the delayed neutron emission rates, which were collected and compiled by Spriggs through the SG6 activity of WPEC. Applicability of the resultant group constants was validated through the analyses of the reactivity measurements based on the period or the rod-drop methods.

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