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Journal Articles

SUIREN (polarized neutron reflectometer)

Takeda, Masayasu

Hamon, 31(1), p.18 - 19, 2021/02

no abstracts in English

Journal Articles

What should we learn from the back numbers of HAMON ?

Takeda, Masayasu

Hamon, 30(1), p.7 - 8, 2020/02

Safety review of JRR-3 under the New Regulatory Requirements was completed on 7th November 2018. Neutron beam will come back in early 2021 after reinforcement works of the roof of the reactor building, the peripheral structures like a stack, a cooling tower, and the experimental hall. The future of neutron sciences using the research reactor strongly depends on how many impacted researches using JRR-3 are achieved after restarting JRR-3. At this stage, we can learn a lot of things from the back numbers of HAMON.

Journal Articles

Report from JRR-3

Shibayama, Mitsuhiro*; Murayama, Yoji; Takeda, Masayasu

AONSA Newsletter (Internet), 11(1), P. 20, 2019/08

no abstracts in English

Journal Articles

Development of high-polarization Fe/Ge neutron polarizing supermirror; Possibility of fine-tuning of scattering length density in ion beam sputtering

Maruyama, Ryuji; Yamazaki, Dai; Akutsu, Kazuhiro*; Hanashima, Takayasu*; Miyata, Noboru*; Aoki, Hiroyuki; Takeda, Masayasu; Soyama, Kazuhiko

Nuclear Instruments and Methods in Physics Research A, 888, p.70 - 78, 2018/04

 Times Cited Count:3 Percentile:45.99(Instruments & Instrumentation)

The multilayer structure of Fe/Si and Fe/Ge systems fabricated by ion beam sputtering (IBS) was investigated using X-ray and polarized neutron reflectivity measurements and scanning transmission electron microscopy with energy-dispersive X-ray analysis. The obtained result revealed that the incorporation of sputtering gas particles (Ar) in the Ge layer gives rise to a marked reduction in the neutron scattering length density (SLD) and contributes to the SLD contrast between the Fe and Ge layers almost vanishing for spin-down neutrons. This leads to a possibility of fine-tuning of the SLD for the IBS, which is required to realize a high polarization efficiency of a neutron polarizing supermirror. Fe/Ge polarizing supermirror with $$m=5$$ fabricated showed a spin-up reflectivity of 0.70 at the critical momentum transfer. The polarization was higher than 0.985 for the $$q_z$$ range where the correction for the polarization inefficiencies of the beamline works properly.

Journal Articles

Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex, 2; Neutron scattering instruments

Nakajima, Kenji; Kawakita, Yukinobu; Ito, Shinichi*; Abe, Jun*; Aizawa, Kazuya; Aoki, Hiroyuki; Endo, Hitoshi*; Fujita, Masaki*; Funakoshi, Kenichi*; Gong, W.*; et al.

Quantum Beam Science (Internet), 1(3), p.9_1 - 9_59, 2017/12

The neutron instruments suite, installed at the spallation neutron source of the Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex (J-PARC), is reviewed. MLF has 23 neutron beam ports and 21 instruments are in operation for user programs or are under commissioning. A unique and challenging instrumental suite in MLF has been realized via combination of a high-performance neutron source, optimized for neutron scattering, and unique instruments using cutting-edge technologies. All instruments are/will serve in world-leading investigations in a broad range of fields, from fundamental physics to industrial applications. In this review, overviews, characteristic features, and typical applications of the individual instruments are mentioned.

Journal Articles

Research and development using the quantum beams in Japan Atomic Energy Agency

Takeda, Masayasu

Hoshasen To Sangyo, (142), p.34 - 37, 2017/06

no abstracts in English

Journal Articles

Current status of Neutron Sciences at Research Reactor JRR-3

Takeda, Masayasu

Hozengaku, 15(2), p.31 - 34, 2016/07

no abstracts in English

Journal Articles

The Role of the research reactor JRR-3 in neutron sciences

Takeda, Masayasu; Matsubayashi, Masahito

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 58(6), p.371 - 375, 2016/06

no abstracts in English

Journal Articles

Magnetic field dependence of the canted spin moment around the interface between ferromagnetic Ni and antiferromagnetic FeMn revealed by the polarized neutron reflectivity

Amemiya, Kenta*; Sakamaki, Masako*; Mizusawa, Mari*; Takeda, Masayasu

JPS Conference Proceedings (Internet), 8, p.034004_1 - 034004_6, 2015/09

Journal Articles

Neutron reflectometers in J-PARC

Yamada, Norifumi*; Takeda, Masayasu; Yamazaki, Dai

Hamon, 24(4), p.288 - 295, 2014/11

no abstracts in English

Journal Articles

Neutron reflectometer

Takeda, Masayasu; Yamazaki, Dai; Hino, Masahiro*

Hamon, 24(3), p.200 - 205, 2014/08

no abstracts in English

Journal Articles

Observation of a $$p$$-wave one-neutron halo configuration on $$^{37}$$Mg

Kobayashi, Nobuyuki*; Nakamura, Takashi*; Kondo, Yosuke*; Tostevin, J. A.*; Utsuno, Yutaka; Aoi, Nori*; Baba, Hidetada*; Barthelemy, R.*; Famiano, M. A.*; Fukuda, Naoki*; et al.

Physical Review Letters, 112(24), p.242501_1 - 242501_5, 2014/06

 Times Cited Count:70 Percentile:94.21(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Deformation-driven $$p$$-wave halos at the drip-line; $$^{31}$$Ne

Nakamura, Takashi*; Kobayashi, Nobuyuki*; Kondo, Yosuke*; Sato, Yoshiteru*; Tostevin, J. A.*; Utsuno, Yutaka; Aoi, Nori*; Baba, Hidetada*; Fukuda, Naoki*; Gibelin, J.*; et al.

Physical Review Letters, 112(14), p.142501_1 - 142501_5, 2014/04

 Times Cited Count:43 Percentile:89.11(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Magnetoresistance effects in current-perpendicular-to-plane structures based on Fe$$_{3}$$Si/FeSi$$_{2}$$ artificial lattices

Sakai, Kenichiro*; Noda, Yuta*; Takeda, Kaoru*; Takeda, Masayasu; Yoshitake, Tsuyoshi*

Physica Status Solidi (C), 10(12), p.1862 - 1865, 2013/12

 Times Cited Count:0 Percentile:0.02

Journal Articles

Role of magnetic chirality in polarization flip upon a commensurate-incommensurate magnetic phase transition in YMn$$_{2}$$O$$_{5}$$

Wakimoto, Shuichi; Kimura, Hiroyuki*; Sakamoto, Yuma*; Fukunaga, Mamoru*; Noda, Yukio*; Takeda, Masayasu; Kakurai, Kazuhisa

Physical Review B, 88(14), p.140403_1 - 140403_5, 2013/10

 Times Cited Count:17 Percentile:64.18(Materials Science, Multidisciplinary)

JAEA Reports

Introduction of assistive devices for neutron scattering experiments

Shimojo, Yutaka; Ihata, Yoshiaki; Kaneko, Koji; Takeda, Masayasu

JAEA-Testing 2012-005, 63 Pages, 2013/02

JAEA-Testing-2012-005.pdf:11.94MB

Taking an advantage of high penetration capability of neutron, neutron scattering experiments can be performed under various sample environment, such as low (high) temperature, pressure, magnetic field and stress, and those complex conditions. To this aim, a number of sample environment accessories, refrigerators, furnaces, pressure cells, superconducting magnets are equipped in JRR-3 to be used for experiments. In this document, all available equipment in both JRR-3 reactor hall and guide hall are summarized. We hope this document would help neutron scattering users to perform effective, and excellent experiments.

Journal Articles

Neutron scattering

Takeda, Masayasu

Hakumaku No Hyoka Gijutsu Handobukku, p.51 - 53, 2013/01

no abstracts in English

Journal Articles

Structural analysis using neutron beams (JRR-3, J-PARC)

Takeda, Masayasu

Hakumaku No Hyoka Gijutsu Handobukku, p.164 - 173, 2013/01

no abstracts in English

Journal Articles

Structural analysis of interfaces in thin films using neutron reflectometry

Takeda, Masayasu

Elekutoronikusu Jisso Gakkai-Shi, 15(6), p.492 - 499, 2012/09

no abstracts in English

252 (Records 1-20 displayed on this page)