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Journal Articles

Neutron moderation, 1; Research reactor as neutron source

Arai, Masaji

Hamon, 28(2), p.99 - 102, 2018/05

A thermal neutron reactor operates by the fission of uranium, a nuclear reaction which produces neutrons of energies in the range of MeV. This is far too high an energy to be useful for neutron scattering experiments. Therefore in a research reactor which has neutron beam utilization there are moderators arranged around the primary source to slow down the source neutrons to useful energies. Additionally almost major research reactors include at least one cold neutron source, a special moderator maintained at cryogenic temperature, where neutrons can equilibrate to lower average energies.

JAEA Reports

Characteristics of thermal neutron calibration fields using a graphite pile

Uchida, Yoshiaki*; Saegusa, Jun; Kajimoto, Yoichi; Tanimura, Yoshihiko; Shimizu, Shigeru; Yoshizawa, Michio

JAERI-Tech 2005-012, 31 Pages, 2005/03

JAERI-Tech-2005-012.pdf:4.58MB

no abstracts in English

Journal Articles

Nondestructive elemental analysis using neutron

Matsue, Hideaki; Tanji, Akira; Miyata, Satoru; Yasuda, Ryo; Matsubayashi, Masahito; Nakanishi, Tomoko

Dai-5-Kai Hoshasen Ni Yoru Hihakai Hyoka Shimpojiumu Koen Rombunshu, p.45 - 48, 2005/02

no abstracts in English

Journal Articles

The Recommended k$$_{0}$$-factors for neutron-induced prompt $$gamma$$-ray analysis and the prompt $$gamma$$-ray emission probabilities

Matsue, Hideaki; Yonezawa, Chushiro

Journal of Radioanalytical and Nuclear Chemistry, 262(1), p.49 - 55, 2004/07

 Times Cited Count:9 Percentile:42.24(Chemistry, Analytical)

The recommended k$$_{0}$$ factors for 81 $$gamma$$-lines of 24 elements, which are useful for neutron induced prompt $$gamma$$-ray analysis (PGA) and are not influenced by neutron spectrum difference, were obtained from the k$$_{0}$$ factors measured with the cold and thermal guided neutron beams of JRR-3M by statistical calculation. The prompt $$gamma$$-ray emission probabilities were derived from the recommended k$$_{0}$$-factors using atomic weight, isotopic abundance and thermal neutron cross-section of other nuclear constants consisting the k$$_{0}$$ factors, for which one can obtain accurate data. The derived $$gamma$$-ray emission probabilities for the light elements (H to Ca) well agreed within $$pm$$10% with those of the ENSDF, which reflect recent data, which the agreements for heavy elements (Ti to Pb) were $$pm$$40% with those of the ENSDF, which are still composed of old data.

Journal Articles

Development of thermal neutron focusing device using supermirrors

Osakabe, Toyotaka; Soyama, Kazuhiko; Suzuki, Koji*; Miyo, Tatsuya*

Hamon, 14(1), p.84 - 87, 2004/01

The neutron-focusing is an indispensable technical element in the experments under extreme condition with tiny samples. In this article, the development of the thermal neutron focusing device is reported. The device has 18 pieces of the 3Q$$_{c}$$ NiC/Ti neutron supermirrors with the shape of a circle. The extension of the end of each mirror meets at a focal point (sample position). Neutrons are repeatedly reflected with the same angle by the inner side of the circle and arrive at the sample position. The test results show that the integrated intensity increases by a factor of 2 or more for the neutron wavelength of 2.36AA .

Journal Articles

Quantitative assessment of interfering nuclear reactions of matrix elements in neutron activation analysis

Miyamoto, Yutaka

Hoshaka Bunseki Handobukku, 7 Pages, 2004/00

no abstracts in English

Journal Articles

Inelasticity effect on neutron scattering intensities of the null-H$$_{2}$$O

Kameda, Yasuo*; Sasaki, Motoya*; Usuki, Takeshi*; Otomo, Toshiya*; Ito, Keiji*; Suzuya, Kentaro; Fukunaga, Toshiharu*

Journal of Neutron Research, 11(3), p.153 - 163, 2003/09

We describe results of time-of-flight (TOF) neutron diffraction of the liquid water null-H$$_{2}$$O in order to investigate the effect of both the scattering angle and the neutron flight path ratio to the observed self-scattering intensities. An empirical inelasticity correction procedure is proposed using the self-scattering intensity observed for the null-H$$_{2}$$O.

Journal Articles

Measurement and evaluation of k$$_{0}$$ factors for PGA at JAERI

Matsue, Hideaki; Yonezawa, Chushiro

Journal of Radioanalytical and Nuclear Chemistry, 257(3), p.565 - 571, 2003/09

 Times Cited Count:7 Percentile:50.04(Chemistry, Analytical)

no abstracts in English

JAEA Reports

Comparison of fission and capture cross sections of minor actinides

Nakagawa, Tsuneo; Iwamoto, Osamu

JAERI-Data/Code 2002-025, 134 Pages, 2003/01

JAERI-Data-Code-2002-025.pdf:3.48MB

no abstracts in English

Journal Articles

Neutron spectrum correction of k$$_{0}$$-factors for k$$_{0}$$-based neutron-induced prompt $$gamma$$-ray analysis

Matsue, Hideaki; Yonezawa, Chushiro

Journal of Radioanalytical and Nuclear Chemistry, 255(1), p.125 - 129, 2003/01

 Times Cited Count:7 Percentile:50.04(Chemistry, Analytical)

no abstracts in English

JAEA Reports

Re-evaluation of neutron nuclear data for $$^{242m}$$Am, $$^{243}$$Am, $$^{99}$$Tc and $$^{140}$$Ce

Nakagawa, Tsuneo; Iwamoto, Osamu; Hasegawa, Akira

JAERI-Research 2002-035, 94 Pages, 2002/12

JAERI-Research-2002-035.pdf:2.73MB

no abstracts in English

JAEA Reports

Curves and tables of neutron cross sections in JENDL-3.3

Nakagawa, Tsuneo; Kawasaki, Hiromitsu*; Shibata, Keiichi

JAERI-Data/Code 2002-020, 327 Pages, 2002/11

JAERI-Data-Code-2002-020-Part1.pdf:12.62MB
JAERI-Data-Code-2002-020-Part2.pdf:18.38MB

no abstracts in English

Journal Articles

Current status of neutron calibration field of JAERI/FRS

Yoshizawa, Michio

Hokeikyo Nyusu, (29), p.2 - 5, 2002/05

no abstracts in English

Journal Articles

Prompt $$gamma$$-ray analysis with reactor neutrons (Review)

Yonezawa, Chushiro

Bunseki Kagaku, 51(2), p.61 - 96, 2002/02

 Times Cited Count:5 Percentile:94.37(Chemistry, Analytical)

no abstracts in English

Journal Articles

Fission mode description of mass distributions for fissioning systems ranging from mass 230 to 262

Son, N. N.*; Nagame, Yuichiro; Nishinaka, Ichiro

Journal of Radioanalytical and Nuclear Chemistry, 250(2), p.255 - 261, 2001/11

 Times Cited Count:0 Percentile:100(Chemistry, Analytical)

no abstracts in English

Journal Articles

Multielement determination of typical diet reference materials by neutron-induced prompt $$gamma$$-ray analysis using k$$_{0}$$ standardization

Matsue, Hideaki; Yonezawa, Chushiro

Journal of Radioanalytical and Nuclear Chemistry, 249(1), p.11 - 14, 2001/06

no abstracts in English

Journal Articles

Measurements of neutron induced fission cross-section for $$^{242m}$$Am from 0.003eV to 10keV using lead slowing-down spectrometer, thermal neutron facility and time-of-flight method

Kai, Tetsuya; Kobayashi, Katsuhei*; Yamamoto, Shuji*; Cho, H.*; Fujita, Yoshiaki*; Kimura, Itsuro*; Okawachi, Yasushi*; Wakabayashi, Toshio*

Annals of Nuclear Energy, 28(8), p.723 - 739, 2001/05

 Times Cited Count:7 Percentile:47.4

no abstracts in English

JAEA Reports

Fabrication of thin cadmium cylinder coated with aluminum for neutron irradiation capsules

Takeyama, Tomonori; Chiba, Masaaki; Isozaki, Futoshi*; Amezawa, Hiroo; Itabashi, Yukio; Kikuchi, Taiji; Otabe, Yoshikiyo*; Hirata, Yuji*; Taka, Isamu; Oba, Toshihiro

JAERI-Tech 2001-024, 32 Pages, 2001/03

JAERI-Tech-2001-024.pdf:4.41MB

no abstracts in English

JAEA Reports

A study on improvements in accuracy of nuclear data measurements using $$gamma$$-ray spectroscopic methods

Furutaka, Kazuyoshi

JNC-TN8400 2000-028, 70 Pages, 2000/10

JNC-TN8400-2000-028.pdf:1.71MB

This report describes the study done by the author as a postdoctoral research associate at Japan Nuclear Cycle Development Institute. This report is divided into two parts: improvements in accuracy in determination of thermal neutron capture cross sections, and improvements in accuracy of photo-nuclear absorption cross section measurements using the HHS. (1)In the measurements of thermal neutron capture cross sections using an activation method, accuracies of the final results attained are limited by (1) accuracy of $$gamma$$-ray peak detection efficiencies, and (2) accuracies of $$gamma$$-ray emission probabilities. In this study; to determine thermal neutron capture cross sections more accurately, the following researches have been done using a newly developed three-dimensional coincidence measurement system: (1)accurate determination of $$gamma$$-ray standard sources using a $$gamma$$-$$gamma$$ coincidence method, for precise calibration of $$gamma$$-ray peak detection efficiency, and (2) development of a $$beta$$-$$gamma$$ coincidence measurement system using a plastic scintillation detector as a $$beta$$-ray detector, for the determination of $$gamma$$-ray emission probabilities of short-lived nuclides, and measurement of $$gamma$$-ray emission probabilities of $$^{100}$$Tc nuclide using the coincidence system. (2)To transform radioactive nuclides with small thermal neutron capture cross sections, use of photonuclear absorption reaction has been suggested. In order to transform these nuclides efficiently using the reaction, one has to know detailed behavior of the photo-absorption cross sections. In this study, a Monte-Carlo simulation code has been used to create a standard set of $$gamma$$-ray response functions of the high-resolution high-energy spectrometer (HHS), to enable reliable analyses of the data obtained by the spectrometer.

Journal Articles

Radiochemical measurements of nuclear data for transmutation of minor actinides

Shinohara, Nobuo

AIP Conference Proceedings 561, p.223 - 231, 2000/09

no abstracts in English

141 (Records 1-20 displayed on this page)