Refine your search:     
Report No.
 - 
Search Results: Records 1-17 displayed on this page of 17
  • 1

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

Verification of a probabilistic fracture mechanics code PASCAL4 for reactor pressure vessels

Lu, K.; Katsuyama, Jinya; Li, Y.; Miyamoto, Yuhei*; Hirota, Takatoshi*; Itabashi, Yu*; Nagai, Masaki*; Suzuki, Masahide*; Kanto, Yasuhiro*

Proceedings of 27th International Conference on Nuclear Engineering (ICONE-27) (Internet), 9 Pages, 2019/05

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

Angular distribution of $$gamma$$ rays from neutron-induced compound states of $$^{140}$$La

Okudaira, Takuya*; Takada, Shusuke*; Hirota, Katsuya*; Kimura, Atsushi; Kitaguchi, Masaaki*; Koga, Jun*; Nagamoto, Kosuke*; Nakao, Taro*; Okada, Anju*; Sakai, Kenji; et al.

Physical Review C, 97(3), p.034622_1 - 034622_15, 2018/03

Journal Articles

Characterization of germanium detectors for the measurement of the angular distribution of prompt $$gamma$$-rays at the ANNRI in the MLF of the J-PARC

Takada, Shusuke*; Okudaira, Takuya*; Goto, Fumiya*; Hirota, Katsuya*; Kimura, Atsushi; Kitaguchi, Masaaki*; Koga, Jun*; Nakao, Taro*; Sakai, Kenji; Shimizu, Hirohiko*; et al.

Journal of Instrumentation (Internet), 13(2), p.P02018_1 - P02018_21, 2018/02

Journal Articles

Design of neutron beamline for fundamental physics at J-PARC BL05

Mishima, Kenji*; Ino, Takashi*; Sakai, Kenji; Shinohara, Takenao; Hirota, Katsuya*; Ikeda, Kazuaki*; Sato, Hiromi*; Otake, Yoshie*; Omori, Hitoshi*; Muto, Suguru*; et al.

Nuclear Instruments and Methods in Physics Research A, 600, p.342 - 345, 2009/02

 Times Cited Count:17 Percentile:18.39(Instruments & Instrumentation)

A new beamline for a fundamental physics experiment is under construction at BL05 port in the Materials and Life Science Facility (MLF) at Japan Proton Accelerator Research Complex (J-PARC), this beamline is designed using novel techniques of neutron optics and it is termed "Neutron Optics and Physics". The beam from the moderator is deflected by multi-channel supermirrors and split into three branches for individual experiments. In this study, we have optimized the design of the beam optics and shields using the Monte Carlo simulation package PHITS. The neutron fluxes of beams are expected to be $$9.2 times 10^5/$$cm$$^2/mu$$str$$/$$s$$/$$MW, $$1.2 times 10^9/$$cm$$^2/$$s$$/$$MW, $$4.0 times 10^8/$$cm$$^2/$$s$$/$$MW, with polarization of 99.8%.

Journal Articles

Highly polarized cold neutron beam obtained by using a quadrupole magnet

Oku, Takayuki; Yamada, Satoru; Shinohara, Takenao; Suzuki, Junichi; Mishima, Kenji*; Hirota, Katsuya*; Sato, Hiromi*; Shimizu, Hirohiko

Physica B; Condensed Matter, 397(1-2), p.188 - 191, 2007/07

 Times Cited Count:4 Percentile:73.45(Physics, Condensed Matter)

We have studied a neutron polarization method by means of a quadrupole magnet. By passing through the aperture of the quadrupole magnet (QM), positive and negative polarity neutrons are accelerated in opposite directions and spatially separated due to the magnetic field gradient. Then, by extracting one spin component, we can obtain a highly polarized neutron beam. Since polarized neutrons do not interact with any substances in this method, we can obtain the polarized neutron beam free from neutron attenuation. As a result of a cold neutron beam polarization experiment by using the QM, we obtained extremely high neutron polarization degree P0.999. In this paper, we show some experimental results of the neutron polarization experiment and discuss the application of the QM-based polarizing device to neutron scattering experiments.

Journal Articles

A Focusing-geometry small-angle neutron scattering instrument with a magnetic neutron lens

Oku, Takayuki; Iwase, Hiroki; Shinohara, Takenao; Yamada, Satoru; Hirota, Katsuya*; Koizumi, Satoshi; Suzuki, Junichi; Hashimoto, Takeji; Shimizu, Hirohiko

Journal of Applied Crystallography, 40(s1), p.s408 - s413, 2007/04

 Times Cited Count:19 Percentile:12.94(Chemistry, Multidisciplinary)

Measuring efficiency and/or angular resolution of small-angle neutron scattering experiments can be improved by focusing neutrons on a detector plane. Thus, a magnetic focusing lens (MNL) have been installed into the SANS instrument, SANS-J-II, of JRR-3 in AEA for the focusing-geometry SANS (FSANS) experiments. The MNL is an extended Halbach-type permanent sextupole magnet. The inner diameter and length of the MNL are 35 mm and 1200 mm, respectively. As the MNL functions as the focusing lens only for the polarized neutron with positive polarity, the incident neutron polarization is set positive by using the supermirror polarizer and the two-coil spin flipper. The intensity distribution of the neutrons focused by the MNL at the detector position was measured by using a high-resolution photomultiplier-based scintillation detector. In this paper, the neutron focusing property of the focusing setup is investigated, and the performance of the FSANS instrument is discussed.

Journal Articles

A Magnetic neutron lens based on an extended Halbach-type permanent sextupole magnet

Oku, Takayuki; Yamada, Satoru; Sasao, Hajime*; Suzuki, Junichi; Shinohara, Takenao*; Hirota, Katsuya*; Ikeda, Kazuaki*; Tsuzaki, Tsuyoshi*; Kiyanagi, Yoshiaki*; Furusaka, Michihiro*; et al.

Physica B; Condensed Matter, 385-386(2), p.1225 - 1228, 2006/11

 Times Cited Count:9 Percentile:53.74(Physics, Condensed Matter)

We have developed a magnetic neutron lens based on an extended Halbach-type permanent sextupole magnet with magnet pieces of NEOMAX-44H, -35EH and high saturation magnetization material, permendule. The aperture size of the magnet is 35 mm in diameter and the magnet length is 2,400 mm. The magnet generates a sextupole magnetic field $$B_s=(C/2)r^2$$ with a gradient coefficient $$C$$=10,600 T/m$$^2$$ inside the aperture, where $$r$$ is a distance from the magnet center axis. To prevent neutrons from hitting and reflecting at the inner surface of the magnet, the surface is covered with cadmium (Cd) sheets and also Cd pinhole slits with size of 30 mm in diameter are positioned in series inside the magnet aperture, resulting in the effective diameter of 30 mm. The neutron focusing property of the magnet is investigated by using pulsed polarized neutrons. The obtained results are discussed with the precise simulation results. Its application to the focusing-geometry small-angle neutron scattering experiments is also discussed.

Oral presentation

Development of a neutron polarizer based on a quadrupole magnet

Oku, Takayuki; Yamada, Satoru; Suzuki, Junichi; Mishima, Kenji*; Shinohara, Takenao*; Ikeda, Kazuaki*; Hirota, Katsuya*; Sato, Hiromi*; Shimizu, Hirohiko*

no journal, , 

no abstracts in English

Oral presentation

Neutron Beta Decay experiment(NBD) at JRR-3; Measurement of beta decay events

Yamada, Satoru; Mishima, Kenji*; Sato, Hiromi*; Hirota, Katsuya*; Shinohara, Takenao*; Morishima, Takahiro*; Ono, Masashi*; Oku, Takayuki; Suzuki, Junichi; Shimizu, Hirohiko*

no journal, , 

no abstracts in English

Oral presentation

Highly polarized neutron beam produced by a quadrupole magnet and its application to fundamental physics

Yamada, Satoru; Oku, Takayuki; Mishima, Kenji*; Sato, Hiromi*; Hirota, Katsuya*; Morishima, Takahiro*; Ono, Masashi*; Shinohara, Takenao; Suzuki, Junichi; Shimizu, Hirohiko*

no journal, , 

no abstracts in English

Oral presentation

Development of a highly efficient neutron polarizing device based on a quadrupole magnet

Oku, Takayuki; Yamada, Satoru*; Shinohara, Takenao; Suzuki, Junichi; Mishima, Kenji*; Hirota, Katsuya*; Sato, Hiromi*; 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

Development of a quadrupole magnet to polarize cold neutrons for SANS experiments

Oku, Takayuki; Suzuki, Junichi; Kira, Hiroshi; Shinohara, Takenao; Takata, Shinichi; Arai, Masatoshi; Hirota, Katsuya*; Iwashita, Yoshihisa*; Shimizu, Hirohiko*

no journal, , 

Spin selective neutron transportation and beam shaping can be realized based on the interaction between the neutron magnetic moment and magnetic field. The magnetic optics for neutrons is flexible optics since we can control its characteristics by changing the multiplicity of magnetic poles. So far, we have constructed the polarized neutron focusing system consisting of the quadrupole and sextupole magnets, and successfully introduced it into the SANS instrument. The quadrupole has a small aperture of 5 mm in diameter. Because of its small aperture, the application of the quadrupole magnet is limited in sans experiments with focusing geometry for high angular resolution. Therefore, we have developed a quadrupole magnet with a larger aperture of 15 mm in diameter and longer magnet length of 2200 mm. In this paper, we described the specifications of the new quadrupole magnet and discuss about its application in polarized neutron scattering.

Oral presentation

Spin selective neutron transportation and shaping by using multiplet magnetic lenses

Oku, Takayuki; Shinohara, Takenao; Suzuki, Junichi; Kira, Hiroshi*; Takata, Shinichi; Arai, Masatoshi; Hirota, Katsuya*; Iwashita, Yoshihisa*; Shimizu, Hirohiko*

no journal, , 

Spin selective neutron transportation and beam shaping can be realized based on the interaction between the neutron magnetic moment and magnetic field. The magnetic optics for neutrons is flexible optics since we can control its characteristics by changing the multiplicity of magnetic poles. Its flexibility is further enhanced by combining the plural functions of the magnetic optics. So far, we have constructed the polarized neutron focusing system consisting of the quadrupole and sextupole magnets, and successfully introduced it into the SANS instrument. Now, we are developing a multiplet magnetic lens system to focus a pulsed neutron beam for a TOF SANS instrument. The details of our work are shown and discussed.

Oral presentation

Study of neutron-nuclear spin correlation term with a polarized xenon target

Sakai, Kenji; Oku, Takayuki; Harada, Masahide; Kai, Tetsuya; Hiroi, Kosuke; Hayashida, Hirotoshi*; Kira, Hiroshi*; Shimizu, Hirohiko*; Hirota, Katsuya*; Okudaira, Takuya*; et al.

no journal, , 

no abstracts in English

Oral presentation

Study of neutron-nuclear spin correlation term with a polarized xenon target

Sakai, Kenji; Oku, Takayuki; Okudaira, Takuya; Kai, Tetsuya; Harada, Masahide; Hiroi, Kosuke; Hayashida, Hirotoshi*; Shimizu, Hirohiko*; Yamamoto, Tomoki*; Ino, Takashi*; et al.

no journal, , 

In neutron fundamental physics, a study of correlation term $${bf s}cdot{bf I}$$ of a neutron spin ${bf s}$ and a target nuclear spin ${bf I}$ is important because the $${bf s}cdot{bf I}$$ term interferes to parity non-conserving (PNC) and time reversal non-conserving (TRNC) terms. For this study, a xenon (Xe) is an interesting nucleus because it has been observed an enhancement of PNC effect around neutron resonance peaks, and polarizes up to $$10^{-2}sim 10^{-1}$$ by using a spin exchange optical pumping (SEOP) method. We attempted to develop a polarized Xe target in a compact in-situ SEOP system and measure neutron polarizing ability caused by the $${bf s}cdot{bf I}$$ term at a 9.6 eV s-wave resonance peak of $$^{129}$$Xe, by detecting change $$Delta R_P$$ of a ratio between neutron transmissions with the polarized and unpolarized Xe target. As preliminary results, we observed a signified value of $$Delta R_{P} approx 0.01$$ after demonstrating that our apparatus could distinguish Doppler broadening effect as systematic error.

17 (Records 1-17 displayed on this page)
  • 1