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Journal Articles

X-ray backscattering study of crystal lattice distortion in hidden order of URu$$_2$$Si$$_2$$

Tabata, Chihiro*; Inami, Toshiya; Michimura, Shinji*; Yokoyama, Makoto*; Hidaka, Hiroyuki*; Yanagisawa, Tatsuya*; Amitsuka, Hiroshi*

Philosophical Magazine, 94(32-33), p.3691 - 3701, 2014/00

 Times Cited Count:15 Percentile:58.17(Materials Science, Multidisciplinary)

Journal Articles

Design of $$gamma$$-ray and neutron area monitoring system for the IFMIF/EVEDA accelerator building

Takahashi, Hiroki; Maebara, Sunao; Kojima, Toshiyuki; Kubo, Takashi; Sakaki, Hironao; Takeuchi, Hiroshi; Shidara, Hiroyuki; Hirabayashi, Keiichi*; Hidaka, Kosuke*; Shigyo, Nobuhiro*; et al.

Fusion Engineering and Design, 86(9-11), p.2795 - 2798, 2011/10

 Times Cited Count:2 Percentile:18.37(Nuclear Science & Technology)

In the IFMIF/EVEDA accelerator, the engineering validation up to 9 MeV by employing the deuteron beam of 125 mA are planning at the BA site in Rokkasho, Aomori, Japan, the personnel protection system (PPS) is indispensable. The PPS inhibit the beam by receiving the interlock signal from the $$gamma$$-ray and neutron monitoring system. The $$gamma$$-ray and neutron detection level which is planned to be adopted are "80 keV to 1.5 MeV ($$gamma$$-ray)" and "0.025 eV to 15 MeV (neutron)". For the present shielding design, it is absolutely imperative for the safety review to validate the shielding ability which makes detection level lower than these $$gamma$$-ray and neutron detector. For this purpose, the energy reduction of neutron and photon for water and concrete is evaluated by PHITS code. From the calculating results, it is found that the photon energy range extended to 10 MeV by water and concrete shielding material only, an additional shielding to decrease the photon energy of less than 1.5 MeV is indispensable.

Journal Articles

Maki parameter and upper critical field of the heavy-fermion superconductor UBe$$_{13}$$

Shimizu, Yusei*; Ikeda, Yoichi*; Wakabayashi, Takumi*; Haga, Yoshinori; Tenya, Kenichi*; Hidaka, Hiroyuki*; Yanagisawa, Tatsuya*; Amitsuka, Hiroshi*

Journal of the Physical Society of Japan, 80(9), p.093701_1 - 093701_4, 2011/09

 Times Cited Count:8 Percentile:50.85(Physics, Multidisciplinary)

Journal Articles

Specific heat and magnetization studies of the superconducting mixed state of UBe$$_{13}$$

Shimizu, Yusei*; Ikeda, Yoichi*; Wakabayashi, Takumi*; Tenya, Kenichi*; Haga, Yoshinori; Hidaka, Hiroyuki*; Yanagisawa, Tatsuya*; Amitsuka, Hiroshi*

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA100_1 - SA100_3, 2011/07

 Times Cited Count:1 Percentile:11.37(Physics, Multidisciplinary)

Journal Articles

Ultrasonic measurements on the cage-structured clathrate compound U$$_3$$Pd$$_{20}$$Si$$_6$$

Yanagisawa, Tatsuya*; Tateiwa, Naoyuki; Mayama, Taichi*; Saito, Hitoshi*; Hidaka, Hiroyuki*; Amitsuka, Hiroshi*; Haga, Yoshinori; Nemoto, Yuichi*; Goto, Terutaka*

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA105_1 - SA105_3, 2011/07

 Times Cited Count:3 Percentile:27.61(Physics, Multidisciplinary)

Journal Articles

Magnetization in the superconducting mixed state of the heavy-fermion compound UBe$$_{13}$$

Shimizu, Yusei*; Ikeda, Yoichi*; Wakabayashi, Takumi*; Tenya, Kenichi*; Haga, Yoshinori; Hidaka, Hiroyuki*; Yanagisawa, Tatsuya*; Amitsuka, Hiroshi*

Journal of Physics; Conference Series, 273, p.012084_1 - 012084_4, 2011/02

 Times Cited Count:3 Percentile:62.9

Journal Articles

Crystallization and preliminary neutron diffraction studies of HIV-1 protease cocrystallized with inhibitor KNI-272

Matsumura, Hiroyoshi*; Adachi, Motoyasu; Sugiyama, Shigeru*; Okada, Shino*; Yamakami, Megumi*; Tamada, Taro; Hidaka, Koshi*; Hayashi, Yoshio*; Kimura, Toru*; Kiso, Yoshiaki*; et al.

Acta Crystallographica Section F, 64(11), p.1003 - 1006, 2008/11

 Times Cited Count:17 Percentile:77.99(Biochemical Research Methods)

This paper reports the crystallization and preliminary neutron diffraction measurements of HIV-1 protease, a potential target for anti-HIV therapy, complexed with an inhibitor (KNI-272). The aim of this neutron diffraction study is to obtain structural information about the H atoms and to determine the protonation states of the residues within the active site. The crystal was grown to a size of 1.4 mm$$^{3}$$ by repeated macroseeding and a slow-cooling method using a two-liquid system. Neutron diffraction data were collected at room temperature using a BIX-4 diffractometer at the JRR-3 research reactor of the Japan Atomic Energy Agency (JAEA). The data set was integrated and scaled to 2.3 ${AA}$ resolution in space group P2(1)2(1)2, with unit-cell parameters a = 59.5, b = 87.4, c = 46.8 ${AA}$.

JAEA Reports

Announced document collection of the 1st Information Exchange Meeting on Radioactive Waste Disposal Research Network (Joint research)

Nakayama, Shinichi; Nagasaki, Shinya*; Inagaki, Yaohiro*; Oe, Toshiaki*; Sasaki, Takayuki*; Sato, Seichi*; Sato, Tsutomu*; Tanaka, Satoru*; Tochiyama, Osamu*; Nagao, Seiya*; et al.

JAEA-Conf 2007-003, 120 Pages, 2007/03

JAEA-Conf-2007-003.pdf:53.18MB

The 1st information exchange meeting on Radioactive Waste Disposal Research Network was held in Nuclear Science Research Institute of Japan Atomic Energy Agency on August 4, 2006. Radioactive Waste Disposal Research Network was established by under Interorganization Atomic Energy Research Program of Japan Atomic Energy Agency, and the objective is to bring both research infrastructures and human expertise in Japan to an adequate performance level, thereby contributing to the development of the fundamental research area in the field of radioactive waste disposal. This lecture material is a collection of research presentations and discussions during the information exchange meeting.

Journal Articles

Eu isotope measurements on single SiC grains from the Murchison meteorite; A New probe of s-process conditions in parent Asymptotic Giant Branch stars

Terada, Kentaro*; Ito, Katsunori*; Hidaka, Hiroshi*; Yoshida, Takashi*; Iwamoto, Nobuyuki; Aoki, Wako*; Williams, I. S.*

New Astronomy Reviews, 50(7-8), p.582 - 586, 2006/10

 Times Cited Count:6 Percentile:20.46(Astronomy & Astrophysics)

Europium isotopic composition could be a good probe to investigate the neutron capture process in Asymptotic Giant Branch stars (AGB stars) and/or supernovae, because the $$^{151}$$Sm and $$^{153}$$Sm branchings are sensitive to the neutron densities and temperature. Here, we report Eu isotopic analyses of single SiC grains from primitive meteorites using the sensitive high resolution ion microprobe. The results are compared with Eu isotopic ratios predicted from the s-process model of AGB stars. The observed Eu isotopic composition of SiC grains place constraints on s-process conditions such as the temperature and neutron densities in AGB stars.

Journal Articles

Mobilization and Mechanisms of Retardation in the Oklo Natural Reactor Zone 2 (Gabon) -Inferences from U, REE, Zr, Mo and Se Isotopes

Bros, R.; Kamei, Gento; Hidaka, Hiroshi*; Onuki, Toshihiko*

Applied Geochemistry, 18(12), p.1807 - 1824, 2003/12

 Times Cited Count:33 Percentile:52.22(Geochemistry & Geophysics)

None

JAEA Reports

Radionuclides release from re-irradiated fuel under high temperature and pressure conditions; $$gamma$$-ray measurements of VEGA-5 test

Hidaka, Akihide; Kudo, Tamotsu; Nakamura, Takehiko; Kanazawa, Toru; Kiuchi, Toshio; Uetsuka, Hiroshi

JAERI-Tech 2003-009, 30 Pages, 2003/03

JAERI-Tech-2003-009.pdf:1.73MB

The VEGA (Verification Experiments of radionuclides Gas/Aerosol release) program is being performed at JAERI to clarify mechanisms of radionuclides release from irradiated fuel during severe accidents and to improve source term predictability. The fifth VEGA-5 test was conducted in January 2002 to confirm the reproducibility of decrease in cesium release under elevated pressure that was observed in the VEGA-2 test and to investigate the release behavior of short-life radionuclides. The PWR fuel of 47GWd/tU after 8.2 years of cooling was re-irradiated at Nuclear Safety Research Reactor (NSRR) for 8 hours before the heat-up test. After that, the two pellets of 10.9g without cladding were heated up to about 2,900K at 1.0MPa under the inert He condition. The experiment reconfirmed the decrease in cesium release under elevated pressure. The release data on short-life radionuclides such as Ru-103 and Ba-140 that has never been observed in the previous VEGA tests without re-irradiation was obtained using the gamma ray measurement.

Journal Articles

Decrease of cesium release from irradiated UO$$_{2}$$ fuel in helium atmosphere under elevated pressure of 1.0MPa at temperature up to 2,773K

Hidaka, Akihide; Kudo, Tamotsu; Nakamura, Takehiko; Uetsuka, Hiroshi

Journal of Nuclear Science and Technology, 39(7), p.759 - 770, 2002/07

 Times Cited Count:6 Percentile:39.58(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Enhancement of cesium release from irradiated fuel at temperature above 2,800K

Hidaka, Akihide; Kudo, Tamotsu; Nakamura, Takehiko; Uetsuka, Hiroshi

Journal of Nuclear Science and Technology, 39(3), p.273 - 275, 2002/03

 Times Cited Count:10 Percentile:54.94(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Behavior of radionuclide release from irradiated fuel under severe accident conditions; Results of VEGA-1 test

Hidaka, Akihide; Nakamura, Takehiko; Kudo, Tamotsu; Uetsuka, Hiroshi

JAERI-Research 2001-055, 48 Pages, 2001/12

JAERI-Research-2001-055.pdf:3.9MB

no abstracts in English

Journal Articles

Influence of pressure on cesium release from irradiated fuel at temperatures up to 2,773K

Kudo, Tamotsu; Hidaka, Akihide; Nakamura, Takehiko; Uetsuka, Hiroshi

Journal of Nuclear Science and Technology, 38(10), p.910 - 911, 2001/10

 Times Cited Count:10 Percentile:59.1(Nuclear Science & Technology)

This article describes the effects of system pressure on the cesium release obtained in the first two tests of radionuclides release from irradiated fuel, VEGA-1 and VEGA-2, which were conducted at the same maximum temperature of 2773K and different system pressures. The fractional releases of Cs in VEGA-2 test at 1.0MPa were smaller than those in VEGA-1 test at atmospheric pressure. In order to quantify the difference of the release rate in the two tests due to the pressure, the release rate coefficients of Cs were evaluated. The Cs release rate coefficient in VEGA-2 was smaller by a factor of about 2.8 than that in VEGA-1 at temperature above about 1900K.

JAEA Reports

Operatioin and maintenance manuals for VEGA apparatus on radionuclide release from irradiated fuel

Hayashida, Retsu*; Hidaka, Akihide; Nakamura, Takehiko; Kudo, Tamotsu; Otomo, Takashi; Uetsuka, Hiroshi

JAERI-Tech 2001-029, 161 Pages, 2001/03

JAERI-Tech-2001-029.pdf:9.33MB

no abstracts in English

Journal Articles

Quick look of first VEGA test and fabrication study of thoria components

Nakamura, Takehiko; Hidaka, Akihide; Kudo, Tamotsu; Hayashida, Retsu*; Otomo, Takashi; Nakamura, Jinichi; Uetsuka, Hiroshi

JAERI-Conf 2000-015, p.201 - 209, 2000/11

no abstracts in English

Journal Articles

Current status of VEGA program and a preliminary test with cesium iodide

Hidaka, Akihide; Nakamura, Takehiko; Kudo, Tamotsu; Hayashida, Retsu*; Nakamura, Jinichi; Otomo, Takashi; Uetsuka, Hiroshi

JAERI-Conf 2000-015, p.193 - 200, 2000/11

no abstracts in English

Journal Articles

The Nuclear interaction at Oklo 2 billion years ago

Fujii, Yasunori*; Iwamoto, Akira; Fukahori, Tokio; Onuki, Toshihiko; Nakakawa, Masayuki; Hidaka, Hiroshi*; Oura, Yasutsugu*; M$"o$ller, P.*

Nuclear Physics B, 573(1-2), p.377 - 401, 2000/05

 Times Cited Count:189 Percentile:97.63(Physics, Particles & Fields)

no abstracts in English

JAEA Reports

Outlines of VEGA Program and a test with cesium iodide for confirmation of fundamental capabilities of the experimental facility

Hidaka, Akihide; Kudo, Tamotsu; Nakamura, Takehiko; Hayashida, Retsu*; Otomo, Takashi; Nakamura, Jinichi; Uetsuka, Hiroshi

JAERI-Research 99-066, p.38 - 0, 1999/12

JAERI-Research-99-066.pdf:6.68MB

no abstracts in English

26 (Records 1-20 displayed on this page)