scattering length from photoproduction on the proton near the reaction threshold

Ishikawa, Takatsugu*; Fujimura, Hisako*; Fukasawa, Hiroshi*; Hashimoto, Ryo*; He, Q.*; Honda, Yuki*; Hosaka, Atsushi; Iwata, Takahiro*; Kaida, Shun*; Kasagi, Jirota*; et al.

Physical Review C, 101(5), p.052201_1 - 052201_6, 2020/05

https://doi.org/10.1103/PhysRevC.101.052201

Status of J-PARC accelerators

Hasegawa, Kazuo; Kinsho, Michikazu; Oguri, Hidetomo; Yamamoto, Kazami; Hayashi, Naoki; Yamazaki, Yoshio; Naito, Fujio*; Hori, Yoichiro*; Yamamoto, Noboru*; Koseki, Tadashi*

Proceedings of 14th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1317 - 1321, 2017/12

After the summer shutdown in 2016, the J-PARC restarted user operation late in October for the neutrino experiments (NU) and early in November for the materials and life science experimental facility (MLF). The beam power for the NU was 420 kW in May 2016, but increased to 470 kW in February 2017 thanks to the change and optimization of operation parameters. For the hadron experimental facility (HD), we started beam tuning in April, but suspended by a failure of the electro static septum. After the treatment, we delivered beam at the power of 37 kW. We delivered beam at 150kW for the MLF. In the fiscal year of 2016, the linac, the 3 GeV synchrotron (RCS) and the MLF were stable and the availability was high at 93%. On the contrary, the main ring has several failures and the availabilities were 77% and 84% for NU and HD, respectively.

Materials and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex, 3; Neutron devices and computational and sample environments

Sakasai, Kaoru; Sato, Setsuo*; Seya, Tomohiro*; Nakamura, Tatsuya; To, Kentaro; Yamagishi, Hideshi*; Soyama, Kazuhiko; Yamazaki, Dai; Maruyama, Ryuji; Oku, Takayuki; et al.

Quantum Beam Science (Internet), 1(2), p.10_1 - 10_35, 2017/09

https://doi.org/10.3390/qubs1020010

Neutron devices such as neutron detectors, optical devices including supermirror devices and He neutron spin filters, and choppers are successfully developed and installed at the Materials Life Science Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC), Tokai, Japan. Four software components of MLF computational environment, instrument control, data acquisition, data analysis, and a database, have been developed and equipped at MLF. MLF also provides a wide variety of sample environment options including high and low temperatures, high magnetic fields, and high pressures. This paper describes the current status of neutron devices, computational and sample environments at MLF.

Estimation of groundwater recharge rate and spatial distribution of hydrological quantities in surface hydrogeological investigation basin of Horonobe URL Project; From December 2004 to November 2009

Yamamoto, Yoichi; Maekawa, Keisuke; Yokota, Hideharu; Yamazaki, Masanori

JAEA-Research 2011-042, 97 Pages, 2012/02

JAEA-Research-2011-042.pdf:11.05MB

The surface hydrogeological investigation has been carried out in and around the Horonobe Underground Research Laboratory area as a part of Horonobe URL project. Observations of meteorological, river flux, water quality, soil moisture and groundwater level have been continued in order to understand the groundwater recharge rate and groundwater flow in the shallow part, which are required for the setting of boundary and initial condition of the groundwater flow analysis. This report shows the summary of the surface hydrogeological investigation and results of recharge rates of investigation basins from December 2004 to November 2009 are calculated by using the water budget method. Spatial estimation of hydrological quantities for the groundwater recharge rate is demonstrated by the runoff analysis. As a result, average of the groundwater recharge rate of whole basins is estimated to 131mm/yr. Suggestive observations related to hydraulic properties of the geology and faults are obtained from consideration to the groundwater recharge rate for each basin.

Estimation of groundwater recharge rate by water balance method in Horonobe area, Hokkaido, Japan; Dec. 2004 Nov. 2009

Yokota, Hideharu; Yamamoto, Yoichi; Yamazaki, Masanori; Maekawa, Keisuke

Nihon Chikasui Gakkai 2010-Nen Shuki Koenkai Koen Yoshi, p.160 - 165, 2010/11

no abstracts in English

Low-barrier hydrogen bond in photoactive yellow protein

Yamaguchi, Shigeo*; Kamikubo, Hironari*; Kurihara, Kazuo; Kuroki, Ryota; Niimura, Nobuo*; Shimizu, Nobutaka*; Yamazaki, Yoichi*; Kataoka, Mikio*

Proceedings of the National Academy of Sciences of the United States of America, 106(2), p.440 - 444, 2009/01

https://doi.org/10.1073/pnas.0811882106

Preparation of large crystals of photoactive yellow protein for neutron diffraction and high resolution crystal structure analysis

Yamaguchi, Shigeo*; Kamikubo, Hironari*; Shimizu, Nobutaka*; Yamazaki, Yoichi*; Imamoto, Yasushi*; Kataoka, Mikio

Photochemistry and Photobiology, 83(2), p.336 - 338, 2007/03

https://doi.org/10.1562/2006-07-23-RA-977

The exact positions of all the hydrogen atoms in photoactive yellow protein (PYP) is important for understanding the molecular mechanism of the photoreaction because the protonation/deprotonation of certain amino acid residues and rearrangements in the hydrogen bond network are involved in the conformational changes of PYP. Neutron crystallography is one of the most effective methods to determine the hydrogen positions. However, a large crystal is required for neutron crystallography because a neutron incident flux is quite limited. In addition, the crystal should be grown from heavy water to reduce the incoherent background from hydrogen. We prepared a large crystal of PYP (dimensions: 1.5 0.7 0.7 mm) for neutron crystallography using ammonium sulfate with sodium chloride. The obtained large crystal gave X-ray diffraction spots up to 0.84 . Although some of the hydrogen atoms could be observed in the high resolution X-ray crystal structure, functionally important hydrogen atoms were impossible to see, indicating the importance of neutron crystallography. Thus, we optimized the crystallization conditions with heavy water and successfully obtained neutron diffraction spots up to 2.1 with the crystal in DO.

Magnetic-field-induced transition in the lattice modulation of colossal magnetoelectric GdMnO and TbMnO compounds

Arima, Takahisa*; Goto, Tsuyoshi*; Yamazaki, Yuichi*; Miyasaka, Shigeki*; Ishii, Kenji; Tsubota, Masami; Inami, Toshiya; Murakami, Yoichi*; Tokura, Yoshinori*

Physical Review B, 72(10), p.100102_1 - 100102_4, 2005/09

https://doi.org/10.1103/PhysRevB.72.100102

Single-crystal synchrotron X-ray diffraction measurements in strong magnetic fields have been performed for magnetoelectric compounds GdMnO and TbMnO. It has been found that the //a ferroelectric phase induced by the application of a magnetic field at low temperatures is characterized by commensurate lattice modulation along the orthorhombic axis with q=1/2 and q=1/4. The lattice modulation is ascribed to antiferromagnetic spin alignment with a modulation vector of (0 1/4 1). The change of the spin structure is directly correlated with the magnetic-field-induced electric phase transition, because any commensurate spin modulation with (0 1/4 1) should break glide planes normal to the axis of the distorted perovskite with the space group.

Prototype tokamak fusion power reactor based on SiC/SiC composite material, focussing on easy maintenance

Nishio, Satoshi; Ueda, Shuzo; Kurihara, Ryoichi; Kuroda, Toshimasa*; Miura, H.*; Sako, Kiyoshi*; Takase, Kazuyuki; Seki, Yasushi; Adachi, Junichi*; Yamazaki, Seiichiro*; et al.

Fusion Engineering and Design, 48(3-4), p.271 - 279, 2000/09

https://doi.org/10.1016/S0920-3796(00)00167-8

no abstracts in English

Improved tokamak concept focusing on easy maintenance

Nishio, Satoshi; Ueda, Shuzo; Aoki, Isao; Kurihara, Ryoichi; Kuroda, Toshimasa*; Miura, H.*; Kunugi, Tomoaki; Takase, Kazuyuki; Seki, Yasushi; Shinya, K.*; et al.

Fusion Engineering and Design, 41, p.357 - 364, 1998/00

https://doi.org/10.1016/S0920-3796(98)00119-7

no abstracts in English