neutron diffraction study on the strength and ductility enhancement mechanism of hydrogen-charged SUS310S stainless steel

Ito, Tatsuya; Ogawa, Yuhei*; Gong, W.; Mao, W.*; Kawasaki, Takuro; Okada, Kazuho*; Shibata, Akinobu*; Harjo, S.

Hamon, 35(3), p.129 - 133, 2025/08

Nanometer-thick crystalline ice plates in rapidly-frozen glucose solution observed by spin-contrast-variation small-angle neutron scattering

Kumada, Takayuki; Nakagawa, Hiroshi; Miura, Daisuke; Sekine, Yurina; Motokawa, Ryuhei; Hiroi, Kosuke; Inamura, Yasuhiro; Oku, Takayuki; Oishi, Kazuki*; Morikawa, Toshiaki*; et al.

Hamon, 34(2), p.50 - 53, 2024/05

https://doi.org/10.5611/hamon.34.2_50

Spin-contrast-variation (SCV) small-angle neutron scattering (SANS) enabled us to determine structure of nano-ice crystals that were generated in rapidly frozen sugar solution. In the frozen glucose solution, we found that the nano-ice crystals formed a planar structure with a radius larger than several tens of nanometers and a thickness of 2-3 nm, which was close to the critical nucleation size of ice crystals in supercooled water. This result suggests that the glucose molecules were preferentially bound to a specific face of nano-ice crystals, and then blocked the crystal growth perpendicular to that face.

Application for the epithermal polarized neutron beam at ANNRI in J-PARC

Endo, Shunsuke; Okudaira, Takuya*

Hamon, 33(2), p.68 - 72, 2023/05

https://doi.org/10.5611/hamon.33.2_68

no abstracts in English

Structure analysis of asymmetric interface using spin-contrast-variation neutron reflectometry

Kumada, Takayuki; Miura, Daisuke*; Akutsu, Kazuhiro*; Oku, Takayuki; Torikai, Naoya*; Niizeki, Tomotake*

Hamon, 32(4), p.165 - 168, 2022/11

https://doi.org/10.5611/hamon.32.4_165

We demonstrated the advantage of spin-contrast-variation neutron reflectometry on the structure analysis of buried interface between resin and porous silica layers. The interface structure was not reproduced by the normal Gaussian model, but by the asymmetric interface model where crosslinked polymer chains neither permeate the pore nor follow the surface roughness of the silica layer.

Dynamics of biomacromolecules observed by incoherent neutron scattering

Matsuo, Tatsuhito*; Nakagawa, Hiroshi

Hamon, 32(1), p.8 - 11, 2022/02

https://doi.org/10.5611/hamon.32.1_8

Incoherent neutron scattering is a powerful tool to investigate the dynamics of biomolecules and water. In this article, a new dynamical model called Matryoshka model is first described, which provides detailed information on the motions contained in the phospholipid molecules based on the scattering spectra. In the latter half of the article, a relationship between water activity and water mobility, and the effects of pressure and hydration on protein dynamics are discussed. These studies demonstrate the advancement of analytical methods which provide ever more detailed information for elucidating the mechanism of biological functions.

Elemental analysis for asteroid Ryugu samples using muonic X-ray analysis

Osawa, Takahito

Hamon, 31(3), p.117 - 120, 2021/08

https://doi.org/10.5611/hamon.31.3_117

Muonic X-ray analysis is an elemental analysis method by detecting characteristic X-rays emitted from muonic atoms and has various advantages, for example, it can detect light elements such as carbon non-destructively. Our research group has been studying to apply this new analytical method to the sample of the asteroid Ryugu brought back by the asteroid explorer Hayabusa2. This paper outlines the research conducted at J-PARC muon facility so far and the preparation status of the experiment on Ryugu samples scheduled to be conducted from June to July 2021. To make this experiment successful, a device with a glove box has been developed that can analyze microsamples in a helium atmosphere, achieving very low background levels.

Introduction of prompt gamma-ray activation analysis system

Osawa, Takahito

Hamon, 31(1), p.7 - 8, 2021/02

https://doi.org/10.5611/hamon.31.1_7

Prompt Gamma-ray activation Analysis system (PGA) installed in JRR-3 is explained.

Expecting big wave of innovation from a small ripple caused by neutrons

Oigawa, Hiroyuki

Hamon, 31(1), P. 1, 2021/02

We have been proceeding with aseismic reinforcing work of the research reactor JRR-3 at the Nuclear Science Research Institute aiming at its restart in February, 2021. All the users of JRR-3 are kindly requested to create innovation with paying attention to safety. For this purpose, we would like to make improvements in safety management, administration system, exchange of researchers, and so on.

Neutron Radiography Facility; TNRF and CNRF

Kurita, Keisuke; Iikura, Hiroshi

Hamon, 31(1), p.11 - 13, 2021/02

https://doi.org/10.5611/hamon.31.1_11

no abstracts in English

Development of spin-contrast-variation neutron reflectometry for structural analyses of multilayer films

Kumada, Takayuki; Miura, Daisuke*; Akutsu, Kazuhiro*; Suzuki, Junichi*; Torikai, Naoya*

Hamon, 30(4), p.207 - 211, 2020/11

https://doi.org/10.5611/hamon.30.4_207

We developed a technique of spin-contrast-variation neutron reflectivity (SCV-NR) for structural analyses of multilayer films. The SCV-NR curves of the polystyrene monolayer film were precisely reproduced using a common set of structural parameters and neutron scattering length density at each proton polarization. This result ensures that SCV-NR curves are not deformed by inhomogeneous PH due to the spin-diffusion mechanism. The number of structural parameters of the lamellar microphase-separated poly(styrene-block-isoprene) thin film is too large to determine with a single unpolarized reflectivity curve only. However, these parameters converged through the global analysis of the SCV-NR curves. In this manner, SCV-NR determines the structure of multilayer films while excluding the incorrect structural model that accidentally accounts for a single unpolarized reflectivity curve only.