Neutron diffractometer for protein crystallography covering large-unit-cell at J-PARC

Kurihara, Kazuo; Tomoyori, Katsuaki; Tamada, Taro; Kuroki, Ryota

no journal, , 

Many of membrane proteins and protein complexes have larger molecular weight and then unit cells of their crystals have larger volume. Therefore, our group had designed the diffractometer which is able to cover such a crystal with large unit cell volume (target lattice length: 250 ). This proposal was accepted by Neutron Instrument Program Review Committee of J-PARC in September 2012. Larger unit cell volume causes a problem to separate spots closer to each other in spatial and time distribution in diffraction images. Therefore, our proposed diffractometer adopts longer camera distance (800mm) and decoupled moderator as neutron source which has shorter pulse width. For covering large neutron detecting area large-area detector (sensitive area 300mm 300mm; spatial resolution 2.5mm; number of installations 40; solid angle coverage 33%) is being developed in collaboration with Neutron Instrumentation Section in J-PARC center. The neutron guide tube has been designed to use limited surface of the decoupled moderator with high luminescence (400mm high 600mm wide) whose luminosity is higher than that of average of the whole surface in the range over 2.86 of wavelength. According to ray-tracing simulation by McStas code, neutron flux at the sample position is estimated to be 5 10/cm/s in the wavelength range of 1.5 - 5.6 (first frame).

Spin and charge excitations in electron-doped copper oxide superconductors observed by X-ray and neutron inelastic scattering

Ishii, Kenji; Fujita, Masaki*; Sasaki, Takanori*; Minola, M.*; Dellea, G.*; Mazzoli, C.*; Kummer, K.*; Ghiringhelli, G.*; Braicovich, L.*; Toyama, Takami*; et al.

no journal, , 

no abstracts in English

Hydration and dynamics of bio-molecule studied by incoherent neutron scattering and molecular simulation

Nakagawa, Hiroshi

no journal, , 

The directions of the neutron inelastic scattering in life science research have been shown by conquering the weak point which neutron experimental maneuver has by the supplement by the interpretation by a molecular simulation, and the device of procurement of a sample. By using a molecular simulation to the analysis of the experimental data of neutron inelastic scattering, it can be said that it is the research which it not only says that the analysis to which calculation was united with the experiment complementarily and synergistically compensates the weak point which experimental maneuver only has, but was excellent in neutron use in the point of pulling out the information potentially included in experimental data of analyzing structure dynamics by atomic resolution. Hydration of a biomolecule and research of dynamics have many outstanding problems which are not known if it is not a neutron, and have inquired by harnessing the advantage of a neutron to the utmost. And the structure fluctuation supporting the function of a biomolecule solved the structure revealed by an interaction with hydrated water by research which combined neutron inelastic scattering and a molecular simulation.

Development of a He nuclear spin flip system for the in-situ SEOP He filter

Hayashida, Hirotoshi*; Kira, Hiroshi*; Suzuki, Junichi*; Oku, Takayuki; Sakai, Kenji; Hiroi, Kosuke; Shinohara, Takenao; Kakurai, Kazuhisa; Aizawa, Kazuya; Arai, Masatoshi; et al.

no journal, , 

no abstracts in English

Contrast variation SANS by proton spin polarization; Upgrade and use at J-PARC

Noda, Yohei; Yamaguchi, Daisuke; Shamoto, Shinichi; Hashimoto, Takeji; Kumada, Takayuki; Takata, Shinichi; Koizumi, Satoshi; Oishi, Kazuki*; Suzuki, Junichi*; Masui, Tomomi*; et al.

no journal, , 

We have developed proton spin polarization technique for contrast variation in small angle neutron scattering (SANS), which utilizes that neutron scattering section can be controlled by polarizing proton spins. Consequently, we succeeded in the analysis of nano-structure in multi-component samples. We will report the detail of our recent activity for getting higher proton spin oplarization. The recent results of SANS measurement with proton spin polarization conducted for the first time at TAIKAN in J-PARC will also be reported.

Spin orbital coupling observed on iron-based superconductors BaFeAs and PrFeAsO

Shamoto, Shinichi; Fukuda, Tatsuo; Kodama, Katsuaki; Ishikado, Motoyuki*; Nakamura, Hiroki; Machida, Masahiko; Baron, A. Q. R.*

no journal, , 

Strong coupling between spin and orbital in iron-based superconductors will be discussed, based on our experimental results of phonon softening of PrFeAsO and anisotopic magnetic moment of BaFeAs.

Structural characterization for N-doped titanium dioxide

Yamaguchi, Daisuke; Hasegawa, Yoshio*

no journal, , 

Anion doped titanium dioxide (TiO), which is expected to exhibit an improved photo-catalytic property due to the effect of narrowing in the band gap, was investigated by small-angle neutron scattering (SANS). Among wide variety of photo-catalytic products, TiO is one of the most promising and various improvements have been done. On the functional aspect it has been confirmed that for instance, nitrogen (N) doped TiO can be activated not only by the photons of which wavelength is corresponding to ultraviolet but also by those of visible light and thereby an enhancement of the efficiency is attained. However, the difference in structure between bare TiO and N-doped TiO has not yet definitively clarified despite the considerable structural analyses by using X-ray probes such as X-ray diffraction or X-ray photoemission spectroscopy. With profiting from an enhanced scattering length of N atoms to the neutron beam, an attempt to capture the distribution of N atoms in the N-doped TiO by SANS is presented here. Specimens prepared by different protocols were compared. One is that the precursor gel solution is extended on the surface of water and two-dimensional porous object, so-called "nanosheet" was fabricated. Then the N-doping was conducted after calcination by putting the specimen under NH atmosphere. The other type of specimen was produced by a simple sol-gel method which led to a granular type specimen. On the granular type specimens contrast variation measurement was carried out, where the specimens were soaked in mixed water of HO/DO = 55/45, 45/55, 35/65, and revealed that the distribution of doped N atom is different from those of nanosheets.

Bragg edge imaging study on microstructure of cast duplex stainless steel

Su, Y. H.; Oikawa, Kenichi; Kai, Tetsuya; Shinohara, Takenao; Harada, Masahide; Arai, Masatoshi; Shiota, Yoshinori*; Kiyanagi, Yoshiaki*; Sato, Hirotaka*; Tomota, Yo*

no journal, , 

Magnetic and crystal structure of strong neutron absorber SmBaMnO

Kiyanagi, Ryoji; Yamada, Shigeki*; Aoki, Hiroshi*; Sagayama, Hajime*; Moyoshi, Taketo*; Nakao, Akiko*; Arima, Takahisa*

no journal, , 

Manganites represented as REAEMnO (Re = trivalent rare earth, AE = divalent alkaline earth) has drawn great attention because of their fascinating and variety of physical properties. SmBaMnO is one kind with Sm and Ba ordered at A-site. This material exhibit a charge-orbital ordering at 380K, another charge-orbital ordering and an antiferromagnetic phase transition around 200K, and an anomaly was also observed at 10K in a magnetic susceptibility data. In order to clarify the detail of the phase transition around 200K and 10K, a single crystal of SmBaMnO was measured on the single crystal diffractometer at J-PARC/MLF, SENJU. The measurement revealed the existence of magnetic superlattice reflections below 180K, which indicated the CE-type spin ordering pattern, which is most commonly seen in this type of materials. A careful measurement of the superlattice reflections clarified that the charge-orbital ordering occurred slightly above the antiferromagnetic phase transition temperature.

Introduction to the International Society for Sample Environment

Kaneko, Koji; Kiefer, K.*; Imperia, P.*; Hernandez, Y.*

no journal, , 

no abstracts in English