Refine your search:     
Report No.
 - 
Search Results: Records 1-20 displayed on this page of 23

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Measurements of neutronic characteristics of rectangular and cylindrical coupled hydrogen moderators

Kai, Tetsuya; Kamiyama, Takashi*; Hiraga, Fujio*; Oi, Motoki; Hirota, Katsuya*; Kiyanagi, Yoshiaki*

Journal of Nuclear Science and Technology, 55(3), p.283 - 289, 2018/03

 Percentile:100(Nuclear Science & Technology)

Journal Articles

Cross section measurements of the radioactive $$^{107}$$Pd and stable $$^{105,108}$$Pd nuclei at J-PARC/MLF/ANNRI

Nakamura, Shoji; Kimura, Atsushi; Kitatani, Fumito; Ota, Masayuki; Furutaka, Kazuyoshi; Goko, Shinji*; Hara, Kaoru; Harada, Hideo; Hirose, Kentaro; Kin, Tadahiro*; et al.

Nuclear Data Sheets, 119, p.143 - 146, 2014/05

 Times Cited Count:4 Percentile:55.88(Physics, Nuclear)

We have started the measurements of the neutron-capture cross sections for stable $$^{105,108}$$Pd nuclei as well as the radioactive $$^{107}$$Pd. The neutron-capture cross-section measurements by the time-of flight method were performed using an apparatus called "Accurate Neutron-Nucleus Reaction measurement Instrument (ANNRI)" installed at the neutron Beam Line No.4 of the Materials and Life science experimental Facility (MLF) in the J-PARC. The neutron-capture cross sections of $$^{107}$$Pd and $$^{105,108}$$Pd have been measured in the neutron energy range from thermal to 300 eV. Some new information was obtained for resonances of these Pd nuclei.

Journal Articles

Energy resolution of pulsed neutron beam provided by the ANNRI beamline at the J-PARC/MLF

Kino, Koichi*; Furusaka, Michihiro*; Hiraga, Fujio*; Kamiyama, Takashi*; Kiyanagi, Yoshiaki*; Furutaka, Kazuyoshi; Goko, Shinji*; Hara, Kaoru; Harada, Hideo; Harada, Masahide; et al.

Nuclear Instruments and Methods in Physics Research A, 736, p.66 - 74, 2014/02

 Times Cited Count:15 Percentile:9.29(Instruments & Instrumentation)

Journal Articles

Measurements of neutron capture cross sections at J-PARC/MLF/ANNRI, 2

Hori, Junichi*; Fujii, Toshiyuki*; Fukutani, Satoshi*; Furusaka, Michihiro*; Furutaka, Kazuyoshi; Goko, Shinji*; Harada, Hideo; Hiraga, Fujio*; Igashira, Masayuki*; Kamiyama, Takashi*; et al.

JAEA-Conf 2011-002, p.29 - 34, 2011/09

The neutron capture cross sections of $$^{93}$$Zr, $$^{99}$$Tc and $$^{107}$$Pd have been measured relative to the $$^{10}$$B(n,$$alphagamma$$) standard cross section by the neutron time-of-flight (TOF) method. Neutron capture $$gamma$$ rays were measured with a 4$$pi$$ Ge spectrometer as a part of the Accurate Neutron-Nucleus Reaction measurement Instrument (ANNRI) installed at the neutron Beam Line No.4 (BL04) of the Material and Life science experimental Facility (MLF) in the Japan Proton Accelerator Research Complex (J-PARC). This paper presents the preliminary results.

Journal Articles

Study of neutron capture reactions using the 4$$pi$$ Ge spectrometer

Harada, Hideo; Goko, Shinji*; Kimura, Atsushi; Ota, Masayuki*; Oshima, Masumi; Kitatani, Fumito; Toh, Yosuke; Furutaka, Kazuyoshi; Kin, Tadahiro; Koizumi, Mitsuo; et al.

Journal of the Korean Physical Society, 59(2), p.1547 - 1552, 2011/08

 Times Cited Count:5 Percentile:54.24(Physics, Multidisciplinary)

For the improvement of the accuracy on the neutron capture cross sections, a 4$$pi$$ Ge spectrometer was developed. The 4$$pi$$ Ge spectrometer is a unique tool due to its superior energy resolution for studying properties on neutron capture reactions, not only capture cross sections but also resonance identification, $$gamma$$-ray intensity distribution, and spin-parity assignment. For example, its performance on the resonance identification was demonstrated using a $$^{rm nat}$$Ag sample. On the measurement of a $$gamma$$-ray intensity distribution for each resonance, the results of $$^{238}$$U will be shown. Using the 4$$pi$$ Ge spectrometer, the measurements of neutron capture cross sections were started at the J-PARC/MLF/ANNRI. The preliminary results on the measurements of neutron capture cross sections will be discussed mainly based on measurements of neutron capture cross sections for $$^{241}$$Am, together with related techniques.

Journal Articles

The "Study on nuclear data by using a high intensity pulsed neutron source for advanced nuclear system" nuclear data project and the characteristics of the neutron beam line for the capture cross section experiments at J-PARC

Kiyanagi, Yoshiaki*; Kino, Koichi*; Furusaka, Michihiro*; Hiraga, Fujio*; Kamiyama, Takashi*; Kato, Kiyoshi*; Igashira, Masayuki*; Katabuchi, Tatsuya*; Mizumoto, Motoharu*; Oshima, Masumi; et al.

Journal of the Korean Physical Society, 59(2), p.1781 - 1784, 2011/08

 Times Cited Count:11 Percentile:34.66(Physics, Multidisciplinary)

The project of the comprehensive nuclear data research for the development of the advanced reactor systems had been executed successfully by eight organizations from 2005 to 2009. In this project, we constructed the pulsed neutron beamline that was aimed to obtain neutron capture cross-sections of long-lived fission products and minor actinides accurately. The energy spectra, spatial distributions, and pulses of the beam were studied by measurements and simulation calculations, and they were found to be consistent with those of the beamline design. In this paper, we present the overview of the project and the properties of the neutron beam provided by this beam line.

Journal Articles

Measurement of energy spectra and spatial distributions of neutron beams provided by the ANNRI beamline for capture cross-section measurements at the J-PARC/MLF

Kino, Koichi*; Furusaka, Michihiro*; Hiraga, Fujio*; Kamiyama, Takashi*; Kiyanagi, Yoshiaki*; Furutaka, Kazuyoshi; Goko, Shinji*; Harada, Hideo; Harada, Masahide; Kai, Tetsuya; et al.

Nuclear Instruments and Methods in Physics Research A, 626-627, p.58 - 66, 2011/01

 Times Cited Count:28 Percentile:5.33(Instruments & Instrumentation)

We measured the energy spectra and spatial distributions of the neutron beam of ANNRI beamline at the Japan Proton Accelerator Research Complex / Materials and Life Science Experimental Facility (J-PARC/MLF). Our research team designed and built this beamline to measure nuclear data with high precision. The measurements were performed on three types of beams provided by the beamline in the neutron energy range of 1.5 meV to 10 keV. The energy spectra show a typical feature of para-hydrogen moderator, and the absolute intensities almost agree with predictions based on both a simulation calculation of the JSNS (Japan Spallation Neutron Source) and a neutron transmission calculation of the beamline. The available neutron intensities at 21.5 m are 7.5$$times$$10$$^{5}$$, 1.6$$times$$10$$^{4}$$, and 1.1$$times$$10$$^{5}$$ n/cm$$^{2}$$/sec in the energy ranges of 1.5-25 meV, 0.9-1.1 eV, and 0.9-1.1 keV, respectively, under the 17.5 kW JSNS operation. The measured spatial distributions of the beams formed by three different collimators are consistent with those expected from the collimator-system design of the beamline. The beam sizes in FWHM are about 29, 14, and 11 mm for the three different beam collimators. The edges of the spatial distributions are relatively sharp, enabling us to measure the nuclear data successfully.

Journal Articles

Status and future perspectives of nuclear data measurements at J-PARC MLF BL04

Harada, Hideo; Oshima, Masumi; Kimura, Atsushi; Goko, Shinji*; Ota, Masayuki*; Furutaka, Kazuyoshi; Kin, Tadahiro; Kitatani, Fumito; Koizumi, Mitsuo; Nakamura, Shoji; et al.

JAEA-Conf 2010-005, p.9 - 14, 2010/12

The neutron-nucleus reaction instrument (NNRI) was installed at the J-PARC MLF BL04, which was designed for measuring neutron cross sections with a neutron time-of-flight technique. This includes two kinds of capture $$gamma$$-ray spectrometers: the 4$$pi$$ Ge spectrometer and the NaI spectrometers. The measurements of neutron capture cross sections for minor actinides and fission products have been started at the NNRI using these spectrometers since 2009. In this paper, the preliminary results and future perspectives are discussed.

Journal Articles

Measurement of neutron capture cross section ratios of $$^{244}$$Cm resonances using NNRI

Goko, Shinji*; Kimura, Atsushi; Harada, Hideo; Oshima, Masumi; Ota, Masayuki*; Furutaka, Kazuyoshi; Kin, Tadahiro; Kitatani, Fumito; Koizumi, Mitsuo; Nakamura, Shoji; et al.

Journal of Nuclear Science and Technology, 47(12), p.1097 - 1100, 2010/12

 Times Cited Count:5 Percentile:56.14(Nuclear Science & Technology)

To obtain the accurate nuclear data of minor actinides required for a nuclear transmutation system or an innovative nuclear fuel cycle system, measurement of neutron-capture cross section of $$^{244}$$Cm was performed using NNRI installed at beam line No.4 (BL04) of MLF in J-PARC. Using "4$$pi$$ Ge spectrometer" that is a component of NNRI, neutron time of flight spectra and prompt $$gamma$$ ray spectra were measured. Then neutron-capture cross section ratios of $$^{244}$$Cm resonances were derived and compared with the evaluated values of JENDL-3.3. The previous experimental data was measured using a nuclear explosion as a pulsed neutron source, and the present result is the first time in the world that such measurements have been carried out at an accelerator facility. By developing techniques for more detailed analysis and improvement of the experimental conditions, the absolute values of capture cross section are expected to be obtained.

JAEA Reports

Measurements of spatial distribution of intensity and energy spectrum of neutrons from coupled hydrogen moderators by using a position sensitive detector (Cooperative research)

Kai, Tetsuya; Kamiyama, Takashi*; Hiraga, Fujio*; Kato, Takashi; Kiyanagi, Yoshiaki*

JAEA-Research 2006-090, 35 Pages, 2007/02

JAEA-Research-2006-090.pdf:13.67MB

Spatial distributions of neutron intensities were measured based on the pinhole camera principle to confirm a peculiar one for a para-hydrogen (H$$_2$$) moderator by neutron transportation calculations. Para- H$$_2$$ and ortho-rich-H$$_2$$ (ortho/para ratio was 60:40-70:30) were utilized. The results are consistent with the calculations. Position dependences of energy spectra were measured for further discussions. Both moderators exhibit the intensity enhancements at the fringe part between 15 and 100 meV. Below 15 meV, the para-H$$_2$$ moderator exhibits higher intensity at the fringe part, while a intensity decrease was recognized at the fringe part of the ortho-rich-H$$_2$$ one. The reasons for the peculiar distribution are due to the characteristics of para- H$$_2$$: the effective slowing-down reaction for thermal neutrons and the higher transmission rate for cold neutrons. The present result is one of the basis confirming the reliability of design calculation used in the J-PARC project.

Journal Articles

Development of a magnetic focusing device for pulsed neutrons

Suzuki, Junichi; Oku, Takayuki; Adachi, Tomohiro*; Shimizu, Hirohiko; Kiyanagi, Yoshiaki*; Kamiyama, Takashi*; Hiraga, Fujio*; Iwasa, Hirokatsu*; Sato, Koichi*; Furusaka, Michihiro*

Nuclear Instruments and Methods in Physics Research A, 529(1-3), p.120 - 124, 2004/08

 Times Cited Count:9 Percentile:41.7(Instruments & Instrumentation)

no abstracts in English

JAEA Reports

None

Kiyanagi, Yoshiaki*; Kamiyama, Takashi*; Hiraga, Fujio*; ; Okawachi, Yasushi

JNC-TY9400 2000-015, 238 Pages, 2000/05

JNC-TY9400-2000-015.pdf:5.47MB

no abstracts in English

Oral presentation

Measurements of cold neutron intensity distribution of coupled hydrogen moderators

Kai, Tetsuya; Kamiyama, Takashi*; Hiraga, Fujio*; Ikeda, Yujiro; Kiyanagi, Yoshiaki*

no journal, , 

The spatial distributions of low-energy neutron intensity from a normal- and a para-hydrogen moderator were measured. Position sensitive helium-3 detectors were used to observe neutrons through a cadmium plate with pin-hole,which was located at the middle of the flight-path. The distribution on the para-hydrogen moderator surface exhibited a intensity increase toward the edge near premoderator,while a decrease at the edge part was found in the normal-hydrogen one. Neutron energy spectra were also measured for both moderator sat various positions on the moderator surfaces, finding that the position dependence on the energy spectrum was quite different. In the para-hydrogen case, the intensity increased toward the edge below 100 meV. In the normal-hydrogen case, the intensity also increased toward the edgebetween 10 to 100 meV, while below 10 meV an almost flat distribution was found except the lower intensity at the edge.

Oral presentation

Detailed analysis for neutron cross section of methane hydrate

Seki, Naoki*; Kamiyama, Takashi*; Kiyanagi, Yoshiaki*; Iwasa, Hirokatsu*; Hiraga, Fujio*; Uchida, Tsutomu*; Igawa, Naoki; Yamauchi, Hiroki; Ishii, Yoshinobu; Ebinuma, Takao*; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of a pulsed sextupole electromagnet for pulsed neutron focusing

Shinohara, Takenao; Suzuki, Junichi; Oku, Takayuki; Iwashita, Hidenori*; Kamiyama, Takashi*; Iwasa, Hirokatsu*; Hiraga, Fujio*; Kiyanagi, Yoshiaki*; Sato, Koichi*; Shimizu, Hirohiko*

no journal, , 

no abstracts in English

Oral presentation

Neutron beam focusing by a pulsed sextupole electromagnet

Shinohara, Takenao; Suzuki, Junichi; Oku, Takayuki; Iwashita, Hidenori*; Kamiyama, Takashi*; Iwasa, Hirokatsu*; Hiraga, Fujio*; Kiyanagi, Yoshiaki*; Sato, Koichi*; Shimizu, Hirohiko*

no journal, , 

no abstracts in English

Oral presentation

Measurement of neutronic performance of J-PARC type coupled moderator

Kai, Tetsuya; Kamiyama, Takashi*; Hiraga, Fujio*; Hirota, Katsuya*; Oi, Motoki; Maekawa, Fujio; Kato, Takashi; Kiyanagi, Yoshiaki*

no journal, , 

no abstracts in English

Oral presentation

Pulse neutron imaging experiments in the first year of J-PARC

Kai, Tetsuya; Harada, Masahide; Oikawa, Kenichi; Sakai, Kenji; Maekawa, Fujio; Oi, Motoki; Shinohara, Takenao; Aizawa, Kazuya; Takata, Shinichi; Arai, Masatoshi; et al.

no journal, , 

Development of imaging techniques with pulse neutrons were started using the NeutrOn Beam-line for Observation and Research Use (NOBORU) of J-PARC at December 2008. The results in the first three months, future research plans and discussions on a new imaging facility in J-PARC are shown.

Oral presentation

Measurements of neutron capture cross sections using a 4$$pi$$Ge spectrometer at the J-PARC/MLF/NNRI

Harada, Hideo; Furutaka, Kazuyoshi; Goko, Shinji; Kimura, Atsushi; Kin, Tadahiro; Kitatani, Fumito; Koizumi, Mitsuo; Nakamura, Shoji; Ota, Masayuki; Oshima, Masumi; et al.

no journal, , 

The measurements of neutron capture cross sections have been started using a 4$$pi$$Ge spectrometer at the neutron nucleus reaction instrument (NNRI) in the J-PARC materials and life science facility (MLF). First set of test measurements using the spectrometer at the J-PARC/MLF/NNRI have been performed for radioactive samples such as Cm-244, etc. The initial test experiments have demonstrated the capability of measuring the neutron capture cross section of Cm-244 with a sample mass of less than 1mg. In this talk, we will report preliminary results of the initial experiments, and discuss the new capability and future perspectives. * Present study is the result of "Study on nuclear data by using a high intensity pulsed neutron source for advanced nuclear system" entrusted to Hokkaido University by the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT).

Oral presentation

Measurement of neutron spectrum at BL04 of J-PARC/MLF

Ota, Masayuki; Oshima, Masumi; Kitatani, Fumito; Kimura, Atsushi; Kin, Tadahiro; Koizumi, Mitsuo; Goko, Shinji; Toh, Yosuke; Nakamura, Shoji; Harada, Hideo; et al.

no journal, , 

The neutron energy spectrum at BL04 of J-PARC/MLF was measured by the time-of-flight method. The $$gamma$$-ray emitted from $$^{10}$$B(n,$$alpha gamma$$)$$ ^{7}$$Li reaction was measured by Ge detector with/without resonance filters of Cd, Mn, Co, In and Ag. The results revealed that the background was very low and the neutron energy spectrum could be determined with accuracy by using $$^{10}$$B(n,$$alpha gamma$$)$$ ^{7}$$Li reaction.

23 (Records 1-20 displayed on this page)