hamon
Online ISSN : 1884-636X
Print ISSN : 1349-046X
ISSN-L : 1349-046X
Volume 22 , Issue 4
Showing 1-4 articles out of 4 articles from the selected issue
  • Masanori Enoki
    2012 Volume 22 Issue 4 Pages 309-313
    Published: 2012
    Released: November 16, 2018
    JOURNALS FREE ACCESS

    We have succeeded in growing sizable single crystal of Bi2+xSr2-xCuO6+y (Bi2201) High-Tc cuprates by improving frosting-zone method. Inelastic neutron scattering measurements on the single-layer cuprate Bi2201 with x=0.2, 0.3, 0.4 and 0.5 reveal existing of magnetic excitation signal at around (0.5, 0.5). The doping evolution of low energy magnetic excitation (ω ≦ 11 meV) was found as a change of incommensurate modulation wave vector from the [110] to [100]/[010] directions, and a linear relationship between the incommensurability and the hole concentration, δ~ p. On the other hands, the spectral weight is strongly suppressed with increasing hole concentration. Similarities and differences in the spin correlations between Bi2201 and the prototypical single-layer system La2-xSrxCuO4 are discussed.

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  • Kazuaki Iwasa
    2012 Volume 22 Issue 4 Pages 314-317
    Published: 2012
    Released: November 16, 2018
    JOURNALS FREE ACCESS

    Interactions between electrons carrying various degrees of freedom are relevant to physical properties and phase transitions in materials. Inelastic neutron spectroscopy for crystal field excitations is meaningful to resolve the electronic interactions. In this article, some example results for rare-earth metallic compounds are briefly shown.

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  • Norifumi L. Yamada, Jaroslaw Majewski, Stephen Holt
    2012 Volume 22 Issue 4 Pages 318-321
    Published: 2012
    Released: November 16, 2018
    JOURNALS FREE ACCESS

    X-ray and neutron reflectometry are powerful techniques for observing depth profiles of surfaces and interfaces on the scale from nanometers to sub-micrometers in a non-destructive manner. In particular, neutrons can penetrate materials, distinguish isotopes, and have magnetic spin moment. This enables us to observe protein structure, especially for the interaction with phospholipid bilayers, with special techniques. In this review, we introduce two protein studies using neutron reflectometry: one is the cholera toxin CTAB5 in contact with a Langmuir monolayer of phospholipid/ganglioside mixture, and the other is the Escherichia coli outer membrane protein OmpF supported on a gold surface with a thiolipid/phospholipid bilayer.

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  • Koichi Nittoh
    2012 Volume 22 Issue 4 Pages 322-328
    Published: 2012
    Released: November 16, 2018
    JOURNALS FREE ACCESS

      Neutron radiography is expanding from the conventional reactor based imaging to the imaging by accelerator based pulsed neutron source. Among them, an expectation for image intensifier technology is increasing especially for video rate dynamic image detection or time dependent imaging in a pulsed neutron source. Based on the X-ray color image intensifier technology, Toshiba has developed neutron color image intensifiers as a powerful imaging tool for dynamic and time dependent neutron radiographies. In this paper, the construction and the feature of the developed neutron color image intensifier and some examples of neutron images are presented. I would be grateful if this paper helps for wide application of neutron color image intensifiers.

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