Differences in water dynamics between the hydrated chitin and hydrated chitosan determined by quasi-elastic neutron scattering

Hirota, Yuki*; Tominaga, Taiki*; Kawabata, Takashi*; Kawakita, Yukinobu; Matsuo, Yasumitsu*

Bioengineering (Internet), 10(5), p.622_1 - 622_17, 2023/05

https://doi.org/10.3390/bioengineering10050622

Hydrogen dynamics in hydrated chitosan by quasi-elastic neutron scattering

Hirota, Yuki*; Tominaga, Taiki*; Kawabata, Takashi*; Kawakita, Yukinobu; Matsuo, Yasumitsu*

Bioengineering (Internet), 9(10), p.599_1 - 599_17, 2022/10

https://doi.org/10.3390/bioengineering9100599

Development of a hybrid piston cylinder cell for quasielastic neutron scattering experiments up to 1 GPa

Hattori, Takanori; Kawamura, Seiko; Kawasaki, Takuro

High Pressure Research, 42(2), p.226 - 235, 2022/00

https://doi.org/10.1080/08957959.2022.2068954

We have developed a hybrid piston cylinder cell for quasi-elastic neutron scattering (QENS) experiments up to about 1 GPa. It consists of a fretted cylinder made of the high tensile steel (SNCM439) liner and the Al alloy (NA700) jacket. Performance tests revealed that the cell can withstand a pressure of 0.8 GPa without irreversible damage and has 4.4 times larger neutron transmission at 3.14 meV (5.10 in wavelength) than that of a conventional CuBe monobloc cylinder. Combined with the sample assembly devised for suppressing multiple scattering, high quality QENS spectra of water were obtained up to 0.8 GPa. This study illustrates the efficacy of the hybrid cylinders not only for increasing maximum available pressure but also manipulating the available pressure and the signal intensity, depending on the purpose of the experiments.

Microscopic dynamics of lithium diffusion in single crystal of the solid-state electrolyte LaLiTiO (x = 0.13) studied by quasielastic neutron scattering

Matsuura, Masato*; Fujiwara, Yasuyuki*; Moriwake, Hiroki*; Ohara, Koji*; Kawakita, Yukinobu

Physical Review B, 104(9), p.094305_1 - 094305_7, 2021/09

https://doi.org/10.1103/PhysRevB.104.094305

Anomalous structure of liquid Bi studied by coherent QENS and time-space correlation analysis

Kawakita, Yukinobu; Kikuchi, Tatsuya*

Hamon, 29(2), p.91 - 94, 2019/05

https://doi.org/10.5611/hamon.29.2_91

Bismuth (Bi) has a double-layered structure based on Peierls distortion in crystalline phase. Complicated static structure in liquid phase which cannot be interpreted by a simple packing model has been conjectured that Peierls distortion may remain even in liquid phase. We measured quasi-elastic neutron scattering (QENS) of liquid Bi by using AMATERAS installed at BL14 beamport of Materials and Life Science Experimental Facility (MLF) in J-PARC and analyzed coherent QENS spectra. A time-space correlation function revealed that the nearest neighboring shell followed by a shoulder-like structure at longer side consists of four contributions of short and long correlations with relatively long relaxation time of a few tens pico second and medium-ranged and the longest correlations with a short relaxation time of sub-pico second, which is a direct observation of the existing layered structure in liquid Bi. In this article, we report the above scientific results and the method to analyze coherent QENS by the time-space correlation function.

Determination of fusion barrier distributions from quasielastic scattering cross sections towards superheavy nuclei synthesis

Tanaka, Taiki*; Narikiyo, Yoshihiro*; Morita, Kosuke*; Fujita, Kunihiro*; Kaji, Daiya*; Morimoto, Koji*; Yamaki, Sayaka*; Wakabayashi, Yasuo*; Tanaka, Kengo*; Takeyama, Mirei*; et al.

Journal of the Physical Society of Japan, 87(1), p.014201_1 - 014201_9, 2018/01

https://doi.org/10.7566/JPSJ.87.014201

Excitation functions of quasielastic scattering cross sections for the Ca + Pb, Ti + Pb, and Ca + Cm reactions were successfully measured by using the gas-filled recoil-ion separator GARIS. Fusion barrier distributions were extracted from these data, and compared with the coupled-channels calculations. It was found that the peak energies of the barrier distributions for the Ca + Pb and Ti + Pb systems coincide with those of the 2n evaporation channel cross sections for the systems, while that of the Ca + Cm is located slightly below the 4n evaporation ones. This results provide us helpful information to predict the optimum beam energy to synthesize superheavy nuclei.

Quasielastic neutron scattering study on rotational aromatic groups of a thermotropic copolyester (vectra)

Koizumi, Satoshi

Journal of Chemical Physics, 107(2), p.603 - 612, 1997/07

https://doi.org/10.1063/1.475157

no abstracts in English

Nucleon transfer in highly mass-asymmetric reaction systems between Au and relatively light projectiles in the energy region below 10 MeV/u, II; Projectile (O)-like products

Yokoyama, Akihiko*; *; *; ; Nagame, Yuichiro; ; ; *; Imanishi, Nobutsugu*

Z. Phys., A, 332, p.71 - 81, 1989/00

no abstracts in English

Dynamics changes of muscle thin filaments related to the regulatory mechanism of muscle contraction

Fujiwara, Satoru; Matsuo, Tatsuhito; Yamada, Takeshi*; Shibata, Kaoru

no journal, , 

no abstracts in English

Construction and operation of the biomolecular dynamics spectrometer DNA

Shibata, Kaoru

no journal, , 

A time-of-flight (TOF) type near-backscattering spectrometer (n-BSS), DNA was built and started operation in 2012 at the Materials and Life Science Experimental Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC).