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Takeno, Hiroyuki*; Uehara, Hiroki*; Murakami, Shozo*; Takenaka, Mikihito*; Kim, M.*; Nagasawa, Naotsugu; Sasaki, Sono*
Journal of Applied Crystallography, 40(s1), p.s656 - s661, 2007/04
Times Cited Count：1 Percentile：14.32(Chemistry, Multidisciplinary)no abstracts in English
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：28 Percentile：89.64(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.
Yamaguchi, Daisuke; Miyamoto, Nobuyoshi; Koizumi, Satoshi; Nakato, Teruyuki*; Hashimoto, Takeji
Journal of Applied Crystallography, 40(s1), p.s101 - s105, 2007/04
Times Cited Count：22 Percentile：86.15(Chemistry, Multidisciplinary)no abstracts in English
Hashimoto, Takeji; Tanaka, Hirokazu*; Koizumi, Satoshi; Naka, Kensuke*; Chujo, Yoshiki*
Journal of Applied Crystallography, 40(s1), p.s73 - s77, 2007/04
Times Cited Count：18 Percentile：83.33(Chemistry, Multidisciplinary)As a problem in open non-equilibrium phenomena, we present small-angle scattering studies of chemical-reaction at specific sites and reaction-induced self-assembly of the system which is induced by mixing two stable solutions of palladium (II) acetate (Pd(OAc)
) in N,N-dimethylformamide and the second-generation polyamidoamine dendrimer in methanol.
and time-resolved ultra small-angle neutron scattering observation on growing poly(methyl methacrylate)-
-polystyrene 
reversible addition-fragmentation chain transfer living radical polymerizationMotokawa, Ryuhei; Koizumi, Satoshi; Zhao, Y.*; Hashimoto, Takeji
Journal of Applied Crystallography, 40(s1), p.s645 - s649, 2007/04
Times Cited Count：8 Percentile：66.47(Chemistry, Multidisciplinary)We investigate living radical polymerization process of poly(methylmethacrylate)--polystyrene (PMMA--PS), i.e., reversible addition-fragmentation chain transfer radical polymerization (RAFT) method, which is observed by in-situ and time-resolved small-angle neutron scattering measurements.
Miyamoto, Nobuyoshi; Inoue, Yoshihisa*; Koizumi, Satoshi; Hashimoto, Takeji
Journal of Applied Crystallography, 40(s1), p.s568 - s572, 2007/04
Times Cited Count：5 Percentile：53.45(Chemistry, Multidisciplinary)no abstracts in English
observation from 10
to 2.0
using a focusing and polarized neutron small-angle scattering spectrometer, SANS-J-IIIwase, Hiroki; Koizumi, Satoshi; Suzuki, Junichi; Oku, Takayuki; Sasao, Hajime*; Tanaka, Hirokazu*; Shimizu, Hirohiko*; Hashimoto, Takeji
Journal of Applied Crystallography, 40(s1), p.s414 - s417, 2007/04
Times Cited Count：15 Percentile：80.29(Chemistry, Multidisciplinary)In order to extend an upper q-limit larger, high-angle He sub-detectors were installed on focusing and polarized neutron small-angle scattering spectrometer (SANS-J-II) at JRR-3, Tokai. Consequently, its upper q-limit was improved from 0.2 to 2. To quantitatively discriminate spin incoherent scattering from hydrogen or to perform nuclear spin polarization contrast variation, a remanent supermirror analyser is also available on the high-angle sub detector. By combining a focusing ultra-small angle scattering, realized by compound and/or magnetic lens and high resolution area detector, SANS-J-II is able to cover from 3
10
to 2 (four order of magnitude of q), which profits to investigate hierarchically ordered system, found widely in hard, soft and bio-materials.
Fujiwara, Satoru; Matsumoto, Fumiko
no journal, ,
no abstracts in English
Masui, Tomomi; Imai, Masayuki*; Urakami, Naohito*
no journal, ,
no abstracts in English
Kumada, Takayuki; Hashimoto, Takeji; Koizumi, Satoshi
no journal, ,
The scattering length of thermal or cold neutrons by proton varies with their relative nuclear-spin orientation, viz. parallel or anti-parallel. If protons in a sub-domain of soft materials are selectively polarized, contrast can be produced in the pattern for small-angle neutron scattering (SANS), which reflect its meso-scale structure. Advantage of this technique is that contrast can be produced without isotope substitution of samples. Moreover, combining contrast variations by spins and isotope substitution, we can determine structures of multiple domain components in complicated materials such as biological systems. The technique of spin-contrast variation by DNP has had a disadvantage, that is, DNP has required large-scale setup. The problem has been overcome by PSI's group. They constructed the DNP system using modern electric devices such as superconducting magnet and miliwave oscillator made of semiconductor devices, which are very compact and easily control nuclear spin polarization. Based on their system, we will develop the compact DNP system designed for SANS study in JAEA.
Iwase, Hiroki; Koizumi, Satoshi; Yoshimura, Tomokazu*; Hashimoto, Takeji
no journal, ,
no abstracts in English
