著者

鬼柳 善明 塩田 佳徳

出版者

日本中性子科学会

雑誌

波紋 (ISSN:1349046X)

巻号頁・発行日

vol.25, no.1, pp.3-7, 2015 (Released:2018-11-14)

参考文献数

10

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Crystallographic analysis of metal cultural heritages is one of important neutron applications, since nondestructive analysis is desired. We have been studying Japanese swords using the pulsed neutron imaging, and obtained position dependent information of crystallite size, anisotropy and lattice spacing. The results coincide with destructive studies, which indicated that the method was useful for the metal artifacts.

著者

河村 幸彦 門馬 綱一 泉 富士夫

出版者

日本中性子科学会

雑誌

波紋 (ISSN:1349046X)

巻号頁・発行日

vol.23, no.1, pp.66-71, 2013 (Released:2018-11-14)

参考文献数

29

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Free programs for the maximum-entropy method (MEM) and three-dimensional visualization are introduced with emphasis on their applications to TOF neutron powder diffraction data. The importance of correcting for thermal diffuse scattering is stressed to improving the accuracy of results obtained by powder diffraction.

著者

増田 開

出版者

日本中性子科学会

雑誌

波紋 (ISSN:1349046X)

巻号頁・発行日

vol.27, no.3, pp.113-116, 2017 (Released:2018-11-14)

参考文献数

24

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This review reports an overview for DT/DD fusion based neutron sources, such as sealed portable neutron generators employing solid-targets, portable neutron generators based on inertial electrostatic confinement of plasmas, and relatively large stationary devices employing either solid- or gas-target with higher intensities. Though less intense than accelerator based neutron sources making use of other nuclear reactions, the DT/DD fusion based compact neutron sources with typically <1 m in length and <20cm in diameter are useful for some specific purposes with their distinct advantages such as portability, minimal gamma-ray byproducts, ability to provide mono-energetic neutrons, and tagged neutrons enabling three-dimensionally spatial resolved analyses. A next generation gas-target based volumetric neutron source has been proposed to extend its capability of neutron yield in excess of 1015 neutrons/sec in a compact configuration ~6 m in length for application to testing fusion reactor materials.

著者

二宮 和彦

出版者

日本中性子科学会

雑誌

波紋 (ISSN:1349046X)

巻号頁・発行日

vol.25, no.1, pp.13-17, 2015 (Released:2018-11-14)

参考文献数

13

被引用文献数

1 1

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A new non-destructive multi-elemental analysis method using negative muon beam has been developed. This method is based on measurement of characteristic muonic X-rays emitted after muonic atom formation. Muonic X-rays are very hard because of a large mass of the muon, so elemental analysis for deeply inside of a bulk material is possible. In addition, because the muon stopping depth can be controlled by adjusting incident muon energy, three-dimensional analysis will be achieved. To develop this elemental analysis method, we performed muon irradiation experiment for two types of archeological samples; bronze artifacts (coin and mirror) for investigation of quantitative elemental composition and estimation of detection limit, and a gold coin (Tempo-koban) for demonstration of elemental depth-profiling without sample destruction.

出版者

「波紋」編集委員会

雑誌

波紋 : Neutron network news (ISSN:1349046X)

巻号頁・発行日

vol.24, 2014-11

著者

小島 誠治

出版者

日本中性子科学会

雑誌

波紋 (ISSN:1349046X)

巻号頁・発行日

vol.16, no.1, pp.44-47, 2006-01-15 (Released:2011-01-27)

参考文献数

15

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Dynamical properties of lithium borate glass are studied by the measurements of complex heat capacity, ultrasonic velocity, Raman scattering and terahertz-time domain spectroscopy. The non-Debye nature of structural relaxation, anharmonicity and boson peak are discussed in relation with fragility.

著者

服部 高典 佐野 亜沙美 有馬 寛

出版者

日本中性子科学会

雑誌

波紋 (ISSN:1349046X)

巻号頁・発行日

vol.26, no.2, pp.85-90, 2016 (Released:2018-11-14)

参考文献数

21

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PLANET is the first neutron powder diffractometer dedicated to high-pressure and high-temperature experiments in the world. The six-axis press designed for this beamline enables routine data collection at pressures and temperatures up to 10 GPa and 2000 ℃. In this article, we introduce how the PLANET had been constructed.

著者

佐藤 卓

出版者

日本中性子科学会

雑誌

波紋 (ISSN:1349046X)

巻号頁・発行日

vol.30, no.1, pp.13-15, 2020-02-10 (Released:2021-06-01)

参考文献数

3

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In this short note, I first look back the days when the Hamon, a membership journal of the Japanese Society for Neutron Science, had launched. The neutron scattering activities of those days for solid state physics are summarized. Then, a comparison is made to current situation. By an extrapolation, near-future prospect for the neutron scattering community will be analyzed.

著者

大竹 淑恵

出版者

日本中性子科学会

雑誌

波紋 (ISSN:1349046X)

巻号頁・発行日

vol.9, no.1, pp.14-21, 1999

著者

藤代 有絵子 金澤 直也

出版者

日本中性子科学会

雑誌

波紋 (ISSN:1349046X)

巻号頁・発行日

vol.30, no.3, pp.144-148, 2020-08-10 (Released:2021-12-01)

参考文献数

23

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We report topological magnetic phase transitions between skyrmion lattice state and hedgehog lattice state realized in cubic chiral magnets MnSi1-xGex. By performing small- and wide-angle neutron scattering experiments, we discover three different topological spin textures with variation of the lattice constant controlled by Si/Ge substitution: skyrmion lattice (x = 0-0.25) and two types of hedgehog lattices with four q-vectors (x = 0.4-0.6) and three q-vectors (x = 0.7-1.0). The variation of magnetic properties in MnSi1-xGex strongly suggests that short-period hedgehog lattices may be stabilized by conduction electron mediated exchange interactions, rather than Dzyaloshinskii-Moriya interaction. We also discuss some recent theoretical proposals concerning the stabilization mechanism of the hedgehog lattices, which are related to high-order exchange interactions.

著者

大竹 淑恵 舟橋 春彦

出版者

日本中性子科学会

雑誌

波紋 (ISSN:1349046X)

巻号頁・発行日

vol.4, no.2, pp.5-7, 1994 (Released:2011-01-27)

参考文献数

9

著者

大竹 淑恵

出版者

日本中性子科学会

雑誌

波紋 (ISSN:1349046X)

巻号頁・発行日

vol.9, no.1, pp.14-21, 1999 (Released:2011-01-27)

参考文献数

8

著者

新村 信雄

出版者

日本中性子科学会

雑誌

波紋 (ISSN:1349046X)

巻号頁・発行日

vol.23, no.4, pp.282-287, 2013 (Released:2018-11-14)

参考文献数

22

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The biological mechanism of the physiological function such as the enzymatic reaction is well understood by studying protonation states of the catalytic polar amino acid residues, which can be identified by neutron protein crystallography. It is proposed that the protonation states should be systematically discussed from the view point of the pKa values of the amino acid residues in proteins. Several examples of the protonation states of the catalytic residues determined by neutron protein crystallography, such as serine proteases (trypsin, elastase, thrombin, & acromobacter protease I), insulin, hen egg white lysozyme, RNase A, and HIV-1 protease were introduced and discussed on the basis of the pKa values.

著者

パーカー ジョセフ ドン 身内 賢太朗 水本 哲矢 西村 広展 奥 隆之 澤野 達哉 篠原 武尚 鈴木 淳市 高田 淳史 谷森 達 上野 一樹 原田 正英 池野 正弘 田中 真伸 内田 智久 服部 香里 岩城 智 株木 重人 岸本 祐二 窪 秀利 黒澤 俊介 松岡 佳大

出版者

日本中性子科学会

雑誌

波紋 (ISSN:1349046X)

巻号頁・発行日

vol.23, no.3, pp.218-222, 2013

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<p>We have developed a prototype time-resolved neutron imaging detector employing a micro-pattern gaseous detector known as the micro-pixel chamber (μPIC) coupled with a field-programmable-gate-array-based data acquisition system. Our detector system combines 100μm-level spatial and sub-μs time resolutions with a low gamma sensitivity of less than 10^-12 and high data rates, making it well suited for applications in neutron radiography at high-intensity, pulsed neutron sources. In the present paper, we introduce the detector system and present several test measurements performed at NOBORU (BL10), J-PARC to demonstrate the capabilities of our prototype. We also discuss future improvements to the spatial resolution and rate performance.</p>

著者

河村 幸彦 泉 富士夫

出版者

日本中性子科学会

雑誌

波紋 (ISSN:1349046X)

巻号頁・発行日

vol.25, no.1, pp.22-25, 2015 (Released:2018-11-14)

参考文献数

18

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CO molecules taken up in clathrate hydrates with structures I and II show highly disordered arrangements, which are hard to analyze by classical methods for structure refinement adopting split-atom models. Rietveld refinements followed by maximum entropy method analyses from TOF neutron powder diffraction data of CO clathrate hydrates made it possible to visualize doughnut- and die-like distributions of CO molecules in 512 and 51264 cages, respectively.

著者

松村 明

出版者

日本中性子科学会

雑誌

波紋 (ISSN:1349046X)

巻号頁・発行日

vol.11, no.4, pp.43-46, 2001-10-15 (Released:2011-01-27)

参考文献数

23

著者

松村 明

出版者

日本中性子科学会

雑誌

波紋 (ISSN:1349046X)

巻号頁・発行日

vol.11, no.4, pp.14-15, 2001-10-15 (Released:2011-01-27)