Okudaira, Takuya; Ueda, Yuki; Hiroi, Kosuke; Motokawa, Ryuhei; Inamura, Yasuhiro; Takata, Shinichi; Oku, Takayuki; Suzuki, Junichi*; Takahashi, Shingo*; Endo, Hitoshi*; et al.
Journal of Applied Crystallography, 54(2), p.548 - 556, 2021/04
Neutron polarization analysis (NPA) for small-angle neutron scattering (SANS) experiments using a pulsed neutron source was successfully achieved by applying a He spin filter as a spin analyzer for the scattered neutrons. The He spin filter covers a sufficient solid angle for performing SANS experiments, and the relaxation time of the He polarization is sufficient for continuous use over a few days, thus reaching the typical duration required for a complete set of SANS experiments. Although accurate evaluation of the incoherent neutron scattering, which is predominantly attributable to hydrogen atoms in samples, is practically difficult using calculations based on the sample elemental composition, the developed NPA approach with consideration of the influence of multiple neutron scattering enabled reliable decomposition of the SANS intensity distribution into the coherent and incoherent scattering components. To date, NPA has not been well established as a standard technique for SANS experiments at pulsed neutron sources. This work is anticipated to greatly contribute to the accurate determination of the coherent neutron scattering component for scatterers in various types of organic sample systems in SANS experiments at J-PARC.
Okudaira, Takuya; Oku, Takayuki; Ino, Takashi*; Hayashida, Hirotoshi*; Kira, Hiroshi*; Sakai, Kenji; Hiroi, Kosuke; Takahashi, Shingo*; Aizawa, Kazuya; Endo, Hitoshi*; et al.
Nuclear Instruments and Methods in Physics Research A, 977, p.164301_1 - 164301_8, 2020/10
Kajimoto, Ryoichi; Yokoo, Tetsuya*; Nakamura, Mitsutaka; Kawakita, Yukinobu; Matsuura, Masato*; Endo, Hitoshi*; Seto, Hideki*; Ito, Shinichi*; Nakajima, Kenji; Kawamura, Seiko
Physica B; Condensed Matter, 562, p.148 - 154, 2019/06
Motokawa, Ryuhei; Kobayashi, Toru; Endo, Hitoshi; Mu, J.*; Williams, C. D.*; Masters, A. J.*; Antonio, M. R.*; Heller, W. T.*; Nagao, Michihiro*
ACS Central Science, 5(1), p.85 - 96, 2019/01
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.
Seto, Hideki; Ito, Shinichi; Yokoo, Tetsuya*; Endo, Hitoshi*; Nakajima, Kenji; Shibata, Kaoru; Kajimoto, Ryoichi; Kawamura, Seiko; Nakamura, Mitsutaka; Kawakita, Yukinobu; et al.
Biochimica et Biophysica Acta; General Subjects, 1861(1), p.3651 - 3660, 2017/01
J-PARC, Japan Proton Accelerator Research Complex provides short pulse proton beam at a repetition rate 25 Hz and the maximum power is expected to be 1 MW. Materials and Life Science Experimental Facility (MLF) has 23 neutron beam ports and 21 instruments have already been operated or under construction / commissioning. There are 6 inelastic / quasi-elastic neutron scattering spectrometers and the complementary use of these spectrometers will open new insight for life science.
Sekine, Yurina; Endo, Hitoshi*; Iwase, Hiroki*; Takeda, Shigeo*; Mukai, Sadaatsu*; Fukazawa, Hiroshi; Littrell, K. C.*; Sasaki, Yoshihiro*; Akiyoshi, Kazunari*
Journal of Physical Chemistry B, 120(46), p.11996 - 12002, 2016/11
The detailed structure of a nanogel formed by self-association of cholesterol-bearing pullulans (CHP) was determined by contrast variation small-angle neutron scattering. The decomposition of scattering intensities into partial scattering functions of each CHP nanogel component, i.e., pullulan, cholesterol, and the cross-term between the pullulan and the cholesterol allows us to investigate the internal structure of the nanogel. The effective spherical radius of the skeleton formed by pullulan chains was found to be about 8.1 nm. In the CHP nanogel, there are about 19 cross-linking points where a cross-linking point is formed by aggregation of trimer cholesterol molecules with the spatially inhomogeneous distribution of the mass fractal dimension of 2.6. The average radius of the partial chains can also be determined to be 1.7 nm. As the result, the complex structure of the nanogels is coherently revealed at the nanoscopical level.
Motokawa, Ryuhei; Kobayashi, Toru; Endo, Hitoshi*; Ikeda, Takashi; Yaita, Tsuyoshi; Suzuki, Shinichi; Narita, Hirokazu*; Akutsu, Kazuhiro*; Heller, W. T.*
Journal of Nuclear Science and Technology, 53(8), p.1205 - 1211, 2016/08
Motokawa, Ryuhei; Endo, Hitoshi*; Nagao, Michihiro*; Heller, W. T.*
Solvent Extraction and Ion Exchange, 34(5), p.399 - 406, 2016/07
Motokawa, Ryuhei; Endo, Hitoshi*; Yokoyama, Shingo*; Ogawa, Hiroki*; Kobayashi, Toru; Suzuki, Shinichi; Yaita, Tsuyoshi
Langmuir, 30(50), p.15127 - 15134, 2014/12
Motokawa, Ryuhei; Endo, Hitoshi*; Yokoyama, Shingo*; Nishitsuji, Shotaro*; Kobayashi, Toru; Suzuki, Shinichi; Yaita, Tsuyoshi
Scientific Reports (Internet), 4, p.6585_1 - 6585_6, 2014/10
Journal of the Physical Society of Japan, 82(Suppl.A), p.SA014_1 - SA014_6, 2013/01
Dynamics of polystyrene in cyclohexane at the theta temperature was investigated by neutron spin echo. The intermediate scattering function up to 50 nano seconds could be observed, then the result was quantitatively compared with the Zimm theory, where the Gaussian approximation for polymer dynamics and the preaveraging approximation for hydrodynamics effect are applied. It was found that the theory and the experimental result only agreed in low momentum transfer range ( with the effective bond length ), which deviated gradually at higher . The experimentally observed decay rate was approximately factor 0.5 smaller than the theoretical prediction at the experimental maximum ().
Endo, Hitoshi; Sugiyama, Masaaki*; Inoue, Rintaro*
Hamon, 22(3), p.258 - 267, 2012/08
In this text, the authors introduce two powerful techniques and one developing one for Small-Angle Neutron Scattering (SANS). The most fascinating feature of neutron as a scattering probe is its isotope effect in hydrogen. The first topic is concerning about recent progress on Contrast Variation Method: the author shows how to apply the contrast variation method to protein-mineral complex system and analyze the data. The second is concerning about deuteration-labeling: the author shows kinetics analysis in quaternary structure of homo-oligomeric protein with this technique. The final topic is concerning about the next generation analysis: an analysis method coupling SANS with neutron spin echo for dynamics of tertiary structure of protein.
Sugimoto, Masahiro*; Kosugi, Keizo*; Katayama, Kota*; Ii, Hideki*; Takagi, Akira*; Endo, Sakaru*; Shimizu, Hitoshi*; Tsubouchi, Hirokazu*; Kizu, Kaname; Yoshida, Kiyoshi
Proceedings of 24th International Cryogenic Engineering Conference (ICEC 24) and International Cryogenic Materials Conference 2012 (ICMC 2012) (CD-ROM), p.799 - 802, 2012/05
We have successfully manufactured all superconducting cables for CS and EF coils of JT-60SA. The low temperature performance of superconducting wires satisfied the specifications under sufficiently low deviations and high production yields. Ni-plated strands of EF cables having the larger sliding friction between strands than that of Cr-plated strands of CS cable caused difficulties on the cabling without any defects. Consequently, the newly developed cabling techniques with the original inspection apparatus significantly enhanced the manufacturability and were effective for guarantee of the quality.
Kobunshi, 60(4), p.193 - 194, 2011/04
Neutron spin echo (NSE) technique is a quite unique and advanced method to study soft matter dynamics. In this manuscript, NSE technique and its applications are briefly reviewed. Then, the Japanese NSE spectrometer iNSE is overviewed. At the end, the future prospects of NSE in Japan are described.
Hamon, 21(1), p.50 - 54, 2011/02
The application of neutron spin echo technique on multi-component systems is introduced. As an example, dynamics of polyrotaxane studied by neutron spin echo with contrast variation method is reviewed. In addition, the current status of iNSE is briefly described.
Endo, Hitoshi; Mayumi, Koichi*; Osaka, Noboru*; Ito, Kozo*; Shibayama, Mitsuhiro*
Polymer Journal, 43(2), p.155 - 163, 2011/02
Polyrotaxane (PR) possesses a supramolecular structure in which cyclic molecules are threaded into an axial polymer. In this study, the static structure of PR dissolved in a good solvent was investigated using contrast variation small-angle neutron scattering. The conformation of the axial linear polymer and the alignment of cyclic molecules within the axial polymer were evaluated quantitatively with the help of a detailed derivation of scattering theory. The decomposed partial scattering functions of the cyclic molecules and the axial polymer and the cross-correlation between cyclic molecules and an axial polymer strongly supported the idea that the alignment of cyclic molecules threaded on the axial polymer is random. On the basis of experimental observation, the entropic origin of the stiffening of PR due to the array of cyclic molecules is discussed.
Endo, Yusuke*; Wu, Y.*; Mimura, Hitoshi*; Niibori, Yuichi*; Koyama, Shinichi; Onishi, Takashi; Obayashi, Hiroshi; Yamagishi, Isao; Ozawa, Masaki
Proceedings of International Conference on Advanced Nuclear Fuel Cycle; Sustainable Options & Industrial Perspectives (Global 2009) (CD-ROM), p.1007 - 1015, 2009/09
The separation of heat-generating nuclide (Cs) from high-level liquid wastes is important in relation to the waste volume reduction. The present paper deals with the preparation of Cs-selective ion-exchangers (silica gels loaded with ammonium molybdophosphate, AMP-SG), uptake properties and characterization. The AMP-SG exhibited large distribution coefficient above 10 cm/g for Cs even in the 2-3 M HNO solution. The uptake isotherm of Cs followed a Langmuir-type equation, and the maximum Cs capacity was 0.24 mmol/g. The breakthrough curves of Cs had S-shaped profile, and the 94% of Cs adsorbed on the AMP-SG column was eluted with 5 M NHNO - 1 M HNO solution. The eluent containing ammonium salt is suitable for both the recovery of Cs and the regeneration of AMP-SG. The precise chromatographic separation of Cs and Rb was also accomplished by using mixed solutions of NHNO and HNO.
Endo, Yusuke*; Wu, Y.*; Mimura, Hitoshi*; Niibori, Yuichi*; Yamagishi, Isao; Koyama, Shinichi; Onishi, Takashi; Ozawa, Masaki
no journal, ,
no abstracts in English
Fujiwara, Satoru; Matsumoto, Fumiko; Nakagawa, Hiroshi; Endo, Hitoshi*; Oda, Toshiro*
no journal, ,
A variety of functions of F-actin related to cell motility arises from flexibility of F-actin that makes interactions with various actin-binding proteins possible. To understand flexibility of F-actin and thereby its multiple functions, it is important to understand dynamic properties of F-actin. As one of the ongoing projects towards this ultimate purpose, we employed neutron spin-echo (NSE) spectroscopy to investigate the motions of F-actin on pico-to-nanosecond timescales and nm spatial scales. We carried out the NSE experiments of F-actin and G-actin with the instrument, iNSE, run by the Institute for Solid State Physics, the University of Tokyo. It was shown that the motions of F-actin and G-actin on nano-scales were described by single relaxation processes, and the motions of F-actin were slower than those of G-actin. Diffusion constants obtained suggested the effects of internal motions of the actin-protomers.