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Journal Articles

Magnetic anisotropy and thermodynamic anomaly in the superconducting mixed state of UBe$$_{13}$$ probed by static dc magnetization measurements

Shimizu, Yusei*; Haga, Yoshinori; Yanagisawa, Tatsuya*; Amitsuka, Hiroshi*

Physical Review B, 93(2), p.024502_1 - 024502_8, 2016/01

 Times Cited Count:7 Percentile:43.79(Materials Science, Multidisciplinary)

Journal Articles

DC magnetization study on heavy-electron superconductor UBe$$_{13}$$

Shimizu, Yusei*; Haga, Yoshinori; Yanagisawa, Tatsuya*; Amitsuka, Hiroshi*; Aoki, Dai*; Brison, J.-P.*; Braithwaite, D.*

JPS Conference Proceedings (Internet), 3, p.015009_1 - 015009_6, 2014/06

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:8 Percentile:44.88(Materials Science, Multidisciplinary)

Journal Articles

Observation of an unusual magnetic anomaly in the superconducting mixed state of heavy-fermion compound UBe$$_{13}$$ by precise dc magnetization measurements

Shimizu, Yusei*; Haga, Yoshinori; Ikeda, Yoichi*; Yanagisawa, Tatsuya*; Amitsuka, Hiroshi*

Physical Review Letters, 109(21), p.217001_1 - 217001_5, 2012/11

 Times Cited Count:15 Percentile:27.79(Physics, Multidisciplinary)

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:7 Percentile:45.48(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:86.08(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:2 Percentile:75.59(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:28.16

JAEA Reports

Analyses of neutronic characteristics of STACY heterogeneous cores composed of 6wt%-enriched uranyl nitrate solution containing gadolinium and 1.5cm-lattice-pitch fuel pins

Izawa, Kazuhiko; Aoyama, Yasuo; Sono, Hiroki; Ogawa, Kazuhiko; Yanagisawa, Hiroshi

JAEA-Technology 2007-001, 40 Pages, 2007/02

JAEA-Technology-2007-001.pdf:2.73MB

A series of critical experiments is conducted in FY 2006 using a heterogeneous core of the Static Experiment Critical Facility (STACY) in the Japan Atomic Energy Agency (JAEA). In the experiment, the core is composed of uranyl nitrate solution ($$^{235}$$U enrichment 6wt%) containing soluble poison (gadolinium) and 333 pins of uranium dioxide ($$^{235}$$U enrichment 5wt%) loaded at a latticepitch of 1.5cm. Prior to the experiment, the following neutronic characteristics were analyzed to assess safety of the core and operation parametor limits: criticality, reactivity and reactor shutdown margins. In the analyses, a Monte Carlo code, MVP, and a neutronics code system, SRAC, were used with an evaluated nuclear data library, JENDL-3.3. From these analyses, it was confirmed that the reactor shutdown margins would comply with the safety criteria under all conditions of the fuel used in the experiments. Simplified formulas for criticality and reactivity were also evaluated based on the analyzed values which are utilized to confirm the operation parameter limits during operations of the core.

Journal Articles

Evaluation of $$gamma$$-ray dose components in criticality accident situations

Sono, Hiroki; Yanagisawa, Hiroshi*; Ono, Akio*; Kojima, Takuji; Soramasu, Noboru*

Journal of Nuclear Science and Technology, 42(8), p.678 - 687, 2005/08

 Times Cited Count:2 Percentile:79.22(Nuclear Science & Technology)

Component analysis of $$gamma$$-ray doses in criticality accident situations is indispensable for further understanding on emission behavior of $$gamma$$-rays and accurate evaluation of external exposure to human bodies. Such dose components were evaluated, categorizing $$gamma$$-rays into four components: prompt, delayed, pseudo components in the period of criticality, and a residual component in the period after the termination of criticality. This evaluation was performed by the combination of dosimetry experiments at the TRACY facility using a thermoluminescent dosimeter (TLD) made of lithium tetra borate and computational analyses using a Monte Carlo code. The evaluation confirmed that the dose proportions of the above components varied with the distance from the TRACY core tank. This variation was due to the difference in attenuation of the individual components with the distance from the core tank. The evaluated dose proportions quantitatively clarified the contribution of the pseudo and the residual components to be excluded for accurate evaluation of $$gamma$$-ray exposure.

JAEA Reports

Evaluation of neutronic characteristics of TRACY water-reflected core system

Sono, Hiroki; Yanagisawa, Hiroshi*; Miyoshi, Yoshinori

JAERI-Tech 2003-096, 84 Pages, 2004/01

JAERI-Tech-2003-096.pdf:3.6MB

Prior to the supercritical experiments using a water-reflected core of the TRACY Facility, neutronic characteristics regarding criticality and reactivity of the core system were evaluated. In the analyses, a continuous energy Monte Carlo code, MVP, and a two-dimensional transport code, TWOTRAN, were used together with a nuclear data library, JENDL-3.3. By comparison to the characteristics in the former-used bare core system of TRACY, the water reflector was estimated not to change the kinetic parameter and to reduce the critical solution level by $$sim$$20 %, the temperature coefficient of reactivity by 6$$sim$$10 %, and the void coefficient of reactivity by $$sim$$18 %, respectively. According to the Nordheim-Fuchs model, the first peak power during a power excursion was evaluated to be $$sim$$15 % smaller than that in the bare system under the same conditions of fuel and reactivity insertion. The influence of the void feedback effect of reactivity, which is left out of consideration in the model, on the power characteristics will be evaluated from the results of the experiments.

JAEA Reports

Analyses of neutronic characteristics of STACY heterogeneous core with 1.5-cm-lattice-pitch fuel pins

Sono, Hiroki; Fukaya, Yuji; Yanagisawa, Hiroshi; Miyoshi, Yoshinori

JAERI-Tech 2003-065, 61 Pages, 2003/07

JAERI-Tech-2003-065.pdf:3.11MB

A series of critical experiments using a heterogeneous core of the Static Experiment Critical Facility (STACY) in the Japan Atomic Energy Research Institute is planned in F.Y. 2003. In the experiment, the core is composed of uranyl nitrate solution ($$^{235}$$U enrichment 6 wt%) and 333 pins of uranium dioxide ($$^{235}$$U enrichment 5 wt%) loaded in lattice-pitch of 1.5 cm. Prior to the experiment, neutronic characteristics are analyzed to evaluate neutronic safety and criticality limitations of the core. The analyzed items are the parameters on criticality, reactivity and reactor shutdown margins. In the analyses, a Monte Carlo code, MVP, and a neutronics code system, SRAC, have been used with an evaluated nuclear data library, JENDL-3.3. By using the calculated characteristics, simplified equations to interpolate these values and criticality limitations of the core are evaluated. It has been also confirmed that the reactor shutdown margins will comply with safety criteria under all fuel conditions in the experiments.

JAEA Reports

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$, but it became over than 40% for the rapid power change with the reactivity of about 3$.

JAEA Reports

Photon and decay data libraries for ORIGEN2 code based on JENDL FP decay data file 2000

Katakura, Junichi; Yanagisawa, Hiroshi

JAERI-Data/Code 2002-021, 81 Pages, 2002/11

JAERI-Data-Code-2002-021.pdf:3.62MB

no abstracts in English

Journal Articles

Evaluation of photon shielding capability for epithermal neutron detection during reactivity-initiated power burst experiments

Yanagisawa, Hiroshi; Nakajima, Ken; Ono, Akio; Miyoshi, Yoshinori

Journal of Nuclear Science and Technology, 39(7), p.800 - 803, 2002/07

 Percentile:100(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Evaluation of power history during power burst experiments in TRACY by combination of $$gamma$$-ray and thermal neutron detectors

Yanagisawa, Hiroshi; Ono, Akio

Journal of Nuclear Science and Technology, 39(6), p.597 - 602, 2002/06

 Times Cited Count:2 Percentile:80.93(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Determination of $$gamma$$-ray exposure rate from short-lived fission products under criticality accident conditions

Yanagisawa, Hiroshi; Ono, Akio; Aizawa, Eiju

Journal of Nuclear Science and Technology, 39(5), p.499 - 505, 2002/05

 Times Cited Count:4 Percentile:67.14(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Report of TRACY operation

Aizawa, Eiju; Ogawa, Kazuhiko; Sakuraba, Koichi; Tsukamoto, Michio; Sugawara, Susumu; Takeuchi, Masaki*; Miyauchi, Masakatsu; Yanagisawa, Hiroshi; Ono, Akio

JAERI-Tech 2002-031, 120 Pages, 2002/03

JAERI-Tech-2002-031.pdf:4.32MB

TRACY (Transient Experiment Critical Facility) in NUCEF (Nuclear Safety Research Facility) is the pulse-type critical facility using uranyl nitrate solution which can carry out various supercritical experiments changing reactivity addition up to 3$.TRACY achieved its first criticality on 20th December 1995,and transient operations have been conducted Since1996.This report summarizes the operation data of 176 experiments from the first criticality to FY2000.

JAEA Reports

TRACY transient experiment databook, 3; Ramp feed experiment

Nakajima, Ken; Yamane, Yuichi; Ogawa, Kazuhiko; Aizawa, Eiju; Yanagisawa, Hiroshi; Miyoshi, Yoshinori

JAERI-Data/Code 2002-007, 123 Pages, 2002/03

JAERI-Data-Code-2002-007.pdf:4.34MB

no abstracts in English

66 (Records 1-20 displayed on this page)