hamon
Online ISSN : 1884-636X
Print ISSN : 1349-046X
ISSN-L : 1349-046X
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Volume 14, Issue 2
Displaying 1-4 of 4 articles from this issue
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  • Pulse shaping with Drabkin energy filter
    Dai Yamazaki
    2004 Volume 14 Issue 2 Pages 130-133
    Published: April 30, 2004
    Released on J-STAGE: January 27, 2011
    DOIhttps://doi.org/10.5611/hamon.14.130
    JOURNAL FREE ACCESS
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    We have been developing Drabkin energy filters for pulse shaping at the J-PARCneutron source.Drabkin energy filter could reduce pulse width without losingwide-bandwidth and also be used as a fast chopper for pulsed neutrons.In this article, simulations on wide-band pulse shaping mode and chopper-mode for J-PARCmoderators are presented along with experimental results on our proto-type Drabkinfilters.
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  • Temperature and Pressure Effects on Thermal Fluctuations of Amphiphilic Monolayers
    Youhei Kawabata, Michihiro Nagao, Hideki Seto, Takayoshi Takeda
    2004 Volume 14 Issue 2 Pages 134-138
    Published: April 30, 2004
    Released on J-STAGE: January 27, 2011
    DOIhttps://doi.org/10.5611/hamon.14.134
    JOURNAL FREE ACCESS
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    We carried out neutron spin echo (NSE) and small-angle neutron scattering (SANS) experiments on a ternary microemulsion involving an ionic surfactant AOT, water, anddecane. Thermal fluctuations of the AOT monolayers have been investigated as afunction of temperature and pressure. The monolayers become more flexible withincreasing temperature, while they become more rigid with increasing pressure. Theseresults are consistent with the microscopic pictures that the head-head repulsion of the AOT molecules is enhanced at high temperature, while an attractive interaction betweenthe hydrophobic tails of the AOT molecules increases at high pressure.
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  • Extraction of Hydrogen-Atom Positions of Synthetic Polymers from the2-Dimensional Neutron Diffraction Pattern Taken by an Imaging Plate System
    A Comparison of Structure Information Analyzed by Neutron, X-ray, and Electron Diffraction Data
    Kohji Tashiro, Ichiro Tanaka, Takashi Oohara, Nobuo Niimura, Satoru Fu ...
    2004 Volume 14 Issue 2 Pages 139-143
    Published: April 30, 2004
    Released on J-STAGE: January 27, 2011
    DOIhttps://doi.org/10.5611/hamon.14.139
    JOURNAL FREE ACCESS
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    2-Dimensional wide-angle neutron diffraction patterns have been measured successfullyfor the uniaxially-oriented samples of fully-deuterated and fully-hydrogeneouspolyethylene by using BIX-3 imaging plate system installed at the Japan Atomic Energy Research Institute.These data were analyzed in detail and the calculation of Fouriermaps allowed us to extract the positions of hydrogen atoms in the crystal latticeaccurately.The structural parameters obtained after refinement were compared withthose derived from the X-ray and electron diffraction experiments as well as thecomputer simulation result. The accurate determination of hydrogen atomic position byneutron technique makes it possible to perform the exact prediction of physicalproperties of polymer crystals in a quantitative manner.
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  • Magnetic Inelastic Scattering of Neutrons
    Yorihiko Tsunoda
    2004 Volume 14 Issue 2 Pages 144-149
    Published: April 30, 2004
    Released on J-STAGE: January 27, 2011
    DOIhttps://doi.org/10.5611/hamon.14.144
    JOURNAL FREE ACCESS
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