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Journal Articles

Uncertainty analyses of neutron cross sections for $$^{235}$$U in the resonance region

Shibata, Keiichi

Journal of Nuclear Science and Technology, 42(1), p.130 - 133, 2005/01

 Times Cited Count:7 Percentile:50.87(Nuclear Science & Technology)

Covariances of neutron cross sections for $$^{235}$$U were evaluated in the resonance region to estimate the accuracy of various design calculations. Energy-averaged cross-section covariances were deduced from available measurements by using the least-square method. The data obtained were combined with the $$^{235}$$U data of JENDL-3.3 in order to complete uncertainty infomation required by users.

JAEA Reports

Measurements of power profile in TRACY supercritical experiment by detecting epithermal neutrons

Nakajima, Ken; Yanagisawa, Hiroshi; Miyoshi, Yoshinori

JAERI-Tech 2003-028, 31 Pages, 2003/03

JAERI-Tech-2003-028.pdf:1.38MB

We have tried to measure the power profile in the TRACY supercritical experiment with high accuracy by detecting epithermal neutrons. In order to measure the epithermal neutrons, a cadmium covered $$^{235}$$U fission chamber was used, and polyethylene, a neutron moderator, was set inside the cadmium to enhance the neutron detection efficiency. In addition, a lead shield was used to reduce the noise current due to gamma-rays. The measured results were compared with the ones using a thermal neutron detector, and it was found that the time delay effect in the thermal neutron detection, which was caused by the flight time of neutrons to reach the detector, distorted the power profile and reduced its peak value. The reduction ratio of peak power was about 4% for the relatively slow power change with the inserted reactivity of 1.5$, but it became over than 40% for the rapid power change with the reactivity of about 3$.

Journal Articles

Adjustment of total delayed neutron yields of $$^{235}$$U, $$^{238}$$U and $$^{239}$$Pu in JENDL-3.2 using benchmark experiments on effective delayed neutron fraction $$beta_{eff}$$

Sakurai, Takeshi; Okajima, Shigeaki

Journal of Nuclear Science and Technology, 39(1), p.19 - 30, 2002/01

 Times Cited Count:5 Percentile:62.25(Nuclear Science & Technology)

The cross section adjustment method was applied to total delayed neutron yields of $$^{235}$$U, $$^{238}$$U and $$^{239}$$Pu of the JENDL-3.2 file by using experimental results of effective delayed neutron fraction $$beta_{eff}$$ at six cores built in two fast critical facilities of the MASURCA and FCA and a thermal critical facility of the TCA to improve these yields. The adjustment was carried out on the yields given at several incident neutron energy points in the file. After the adjustment, the yield of $$^{238}$$U was almost uniformly decreased by about 3% below 7 MeV. The yield of $$^{239}$$Pu was increased by 2.6% and that of $$^{235}$$U was decreased by 0.9% at the thermal energy point, while the change of yield was less than 0.3% at the other energy points for these nuclides. By using these adjusted yields, the uncertainty of calculated $$beta_{eff}$$ was reduced and the agreement of $$beta_{eff}$$ between experiment and calculation was improved.

Journal Articles

First-order phase transition in UO$$_{2}$$; $$^{235}$$U and $$^{17}$$O NMR study

Ikushima, Kenji; Tsutsui, Satoshi; Haga, Yoshinori; Yasuoka, Hiroshi; Walstedt, R. E.; Masaki, Nobuyuki; Nakamura, Akio; Nasu, Saburo*; Onuki, Yoshichika

Physical Review B, 63(10), p.104404_1 - 104404_11, 2001/03

 Times Cited Count:71 Percentile:6.28(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Isomeric yield ratios of $$^{134}$$I and $$^{136}$$I in the proton-, $$^{12}$$C- and $$^{19}$$F-induced fission of $$^{235}$$U, $$^{237}$$Np and $$^{238}$$U

Shinohara, Nobuo; Tsukada, Kazuaki; Ichikawa, Shinichi; Magara, Masaaki; Hatsukawa, Yuichi

Radiochimica Acta, 88(1), p.1 - 5, 2000/00

 Times Cited Count:0 Percentile:100(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Nuclear magnetic moment of the first excited state (I=2$$^{+}$$) of $$^{238}$$U

Tsutsui, Satoshi*; Nasu, Saburo*; Nakada, Masami; ; Saeki, Masakatsu; *; *; Nakamura, Akio

Journal of the Physical Society of Japan, 67(8), p.2641 - 2644, 1998/08

 Times Cited Count:8 Percentile:44.15(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Observation of $$^{235}$$U NMR in the Antiferromagnetic state of UO$$_{2}$$

*; *; Tsutsui, Satoshi*; Saeki, Masakatsu; Nasu, Saburo*; *

Journal of the Physical Society of Japan, 67(1), p.65 - 66, 1998/01

 Times Cited Count:16 Percentile:18.35(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Neutron cross sections for the $$^{93}$$Nb(n,n')$$^{93m}$$Nb and $$^{199}$$Hg(n,n')$$^{199m}$$Hg reactions compiled in JENDL dosimetry file

Sakurai, Kiyoshi

Nippon Genshiryoku Gakkai-Shi, 39(3), p.231 - 236, 1997/00

 Times Cited Count:0 Percentile:100(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Neutron cross sections for $$^{93}$$Nb(n,n′)$$^{93m}$$Nb and $$^{199}$$Hg(n,n′)$$^{199m}$$Hg reactions compiled in JENDL dosimetry file

Sakurai, Kiyoshi

JAERI-Research 94-005, 16 Pages, 1994/08

JAERI-Research-94-005.pdf:0.63MB

no abstracts in English

Journal Articles

Benchmark tests of principal fissile nuclide data in JENDL-3 with simple fast critical assemblies

D.Tian*; ; Nakagawa, Tsuneo;

Journal of Nuclear Science and Technology, 30(11), p.1087 - 1098, 1993/11

no abstracts in English

JAEA Reports

Experimental comparison of calibration methods for measurement of reaction rate by using fission foils

Sakurai, Takeshi; ; Obu, Makoto; ; Kobayashi, K.*; Unesaki, Hironobu*

JAERI-M 93-153, 50 Pages, 1993/08

JAERI-M-93-153.pdf:1.31MB

no abstracts in English

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