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Online ISSN : 1884-636X
Print ISSN : 1349-046X
ISSN-L : 1349-046X
19 巻, 3 号
選択された号の論文の7件中1~7を表示しています
受賞記事
  • 奥 隆之
    2009 年 19 巻 3 号 p. 140-145
    発行日: 2009年
    公開日: 2018/04/13
    ジャーナル フリー

    We have investigated suitable magnetic field distribution to polarize neutrons based only on the electromagnetic interaction between a neutron magnetic moment and magnetic field, and found out a quadrupole field was the most suitable among simple multipole fields. Then we constructed a quadrupole magnet with a Halbach magnetic circuit as the neutron polarizing device. A cold neutron polarizing experiment of the quadrupole magnet was performed at the beamline C3-1-2-1 (NOP) of JRR-3 at JAEA. By passing through the aperture of the quadrupole magnet, positive and negative polarity neutrons are accelerated in opposite directions and spatially separated. Therefore, we extracted the one-spin component and analyzed its polarization degree. As a result very high neutron polarization degree P=0.9993±0.0025 was obtained. Then the quadrupole magnet was installed into the polarized neutron focusing geometry SANS instrument SANS-J-II of JRR-3. The instrument performance was enhanced by about 10 times compared with the case with the magnetic supermirror as the neutron polarizing device. The details are shown and discussed.

サイエンス記事
技術ノート
入門講座「残留応力」
入門講座「中性子反射率測定」
  • 金谷 利治, 川島 和子, 井上 倫太郎, 宮崎 司
    2009 年 19 巻 3 号 p. 161-164
    発行日: 2009年
    公開日: 2018/04/13
    ジャーナル フリー

    Recent extensive studies have revealed that polymer thin films showed very interesting but unusual thermal properties and stabilities. In the article we show that X-ray reflectivity and neutron reflectivity are very powerful tools to study the anomalous properties of polymer thin films.

  • 小林 元康, 高原 淳
    2009 年 19 巻 3 号 p. 165-169
    発行日: 2009年
    公開日: 2018/04/13
    ジャーナル フリー

    This article describes the swelling behavior of polyelectrolyte brushes in aqueous solutions with different salt concentrations analyzed by neutron reflectometry. Densely-grafted polyelectrolyte brushes such as poly(2-(methacryloyloxy)ethyl phosphorylcholine) (PMPC), poly(2-(methacryloyloxy)ethyltrimethylammonium chloride) (PMTAC), and poly(3-dimethyl(methacryloyloxyethyl)ammonium propane sulfonate) (PDMAPS) were prepared on quartz substrate by "grafting-from" method based on a surface-initiated polymerization technique. Neutron reflectivity at swollen brushes/D2O interface afforded the neutron scattering length density profiles and the corresponding volume fraction profiles based on a parabolic function to estimate the swollen brush thickness. PMTAC brush was fairly extended from the substrate surface in D2O, while it shrunk in NaCl/D2O solution due to the screening of the repulsive interaction between polycations by hydrated salt ions. In contrast, PDMAPS brush in D2O formed shrunk structure due to strong attractive interaction between sulfobetain groups, while the swollen thickness was drastically increased by addition of salt ions to D2O. Non-dependency of swollen thickness on NaCl concentration was observed in PMPC brush because of weak electrostatic interaction between phosphorylcholine groups.

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