Polarized neutrons observed nanometer-thick crystalline ice plates in frozen glucose solution

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

Journal of Physical Chemistry Letters (Internet), 14(34), p.7638 - 7643, 2023/08

https://doi.org/10.1021/acs.jpclett.3c01448

The structure of nano-ice crystals in rapidly frozen glucose solution was elucidated by using spin-contrast-variation small-angle neutron scattering, which distinguishes the nano-ice crystal signal from the frozen amorphous solution signal by the polarization-dependent neutron scattering. The analysis revealed that the nano-ice crystals form a planar structure with a diameter exceeding tens of nanometers and a thickness of 1 nm, which is close to the critical nucleation size. This result suggests that the glucose molecules are preferentially bound to a specific face of nano-ice crystals, and then block the crystal growth perpendicular to that face.

Measurement of the transverse asymmetry of rays in the Sn()Sn reaction

Endo, Shunsuke; Okudaira, Takuya*; Abe, Ryota*; Fujioka, Hiroyuki*; Hirota, Katsuya*; Kimura, Atsushi; Kitaguchi, Masaaki*; Oku, Takayuki; Sakai, Kenji; Shima, Tatsushi*; et al.

Physical Review C, 106(6), p.064601_1 - 064601_7, 2022/12

https://doi.org/10.1103/PhysRevC.106.064601

no abstracts in English

Extraction of hydrogen location in molecular crystals in spin-contrast-variation neutron powder diffractometry

Miura, Daisuke*; Kumada, Takayuki; Iwata, Takahiro*

Nihon Kessho Gakkai-Shi, 63(4), p.287 - 293, 2021/12

https://doi.org/10.5940/jcrsj.63.287

We have developed the spin-contrast-variation neutron powder diffractometry to observe hydrogen atoms in a crystalline sample by polarized neutron and polarized proton in the crystal. L-glutamic acid crystals were dispersed in a deuterated polystyrene matrix containing a polarizing agent. The intensities of the diffraction peaks of the sample changed according to the proton polarization. The spin-contrast-variation neutron powder diffractometry can extract diffraction from hydrogen atoms because of the variation of peak intensities as a function of the proton polarization. This technique is expected to enable analyses of the structures of hydrogen-containing materials that are difficult to determine with conventional powder diffractometry.

Development and application of a He neutron spin filter at J-PARC

Okudaira, Takuya; Oku, Takayuki; Ino, Takashi*; Hayashida, Hirotoshi*; Kira, Hiroshi*; Sakai, Kenji; Hiroi, Kosuke; Takahashi, Shingo*; Aizawa, Kazuya; Endo, Hitoshi*; et al.

Nuclear Instruments and Methods in Physics Research A, 977, p.164301_1 - 164301_8, 2020/10

https://doi.org/10.1016/j.nima.2020.164301

Development of the neutron polarizer for the T-violation search using compound nuclei

Okudaira, Takuya; Oku, Takayuki; Sakai, Kenji; Ino, Takashi*; Hayashida, Hirotoshi*; Hiroi, Kosuke; Shinohara, Takenao; Kakurai, Kazuhisa*; Aizawa, Kazuya; Shimizu, Hirohiko*; et al.

Proceedings of Science (Internet), 356, p.029_1 - 029_5, 2019/12

https://doi.org/10.22323/1.356.0029

The technology development section carries out the development of the neutron polarization device: He Spin Filter. It is often used for the fundamental physics region. In order to explain the matter-dominated universe, a time reversal violation is necessary and searches for new physics are conducted in the world. The T-violation search using a polarized neutron beam is planned at J-PARC. A large He spin filter is needed to polarize high energy neutrons for the experiment and is developed in JAEA. Recently, we developed the accurate measurement system to evaluate the polarization of He and a vacuum system to make the He spin filter, and large He spin filters for epi-thermal neutron was made using the system. The current status of the development of the He spin filter will be talked.

Magnetic field dependence of the canted spin moment around the interface between ferromagnetic Ni and antiferromagnetic FeMn revealed by the polarized neutron reflectivity

Amemiya, Kenta*; Sakamaki, Masako*; Mizusawa, Mari*; Takeda, Masayasu

JPS Conference Proceedings (Internet), 8, p.034004_1 - 034004_6, 2015/09

https://doi.org/10.7566/JPSCP.8.034004

Neutron polarization control for beam handling and spectrometry

Yamazaki, Dai; Ebisawa, Toru*

Hamon, 15(1), p.51 - 54, 2005/01

https://doi.org/10.5611/hamon.15.51

Neutron spin handling could be used for beam control and spectroscopy. Energy analysis could be performed with Drabkin energy filters, by which inelastic component with a , a or a could be extracted for all incident wavelength. Pulsed spin-flipper and polarization analyzer could be used as a neutron chopper (spin-flip chopper) whose opening time, number of windows and phase are controlled independently. It was demonstrated that S/N ratio can be enhanced up to 1.5 10 by installing three spin-flip choppers in sequence.

Pressure-induced successive magnetic phase transitions in the spin gap system TlCuCl

Osawa, Akira; Kakurai, Kazuhisa; Osakabe, Toyotaka; Nakamura, Mitsutaka; Takeda, Masayasu; Tanaka, Hidekazu*

Journal of the Physical Society of Japan, 73(6), p.1446 - 1449, 2004/06

https://doi.org/10.1143/JPSJ.73.1446

no abstracts in English

Anomalous spin density distribution in CeB

Saito, Masahiro*; Okada, Noriko*; Nishibori, Eiji*; Takagiwa, Hiroyuki*; Yokoo, Tetsuya*; Nishi, Masakazu*; Kakurai, Kazuhisa; Kunii, Satoru*; Takata, Masaki*; Sakata, Makoto*; et al.

Journal of the Physical Society of Japan, 71(10), p.2369 - 2372, 2002/10

https://doi.org/10.1143/JPSJ.71.2369

no abstracts in English

Precise experiment on (anti-n)+d scattering at 12MeV

Nishimori, Nobuyuki; Sagara, K.*; Fujita, T.*; Wakamatsu, Fumihiko*; Bussaki, Toru*; Maeda, Kazuhide*; Akiyoshi, H.*; Tsuruta, Kaoru*; Nakamura, Hiroyuki*; Nakashima, Takao*

Nuclear Fusion, 631, p.697C - 700C, 1998/03

no abstracts in English