Thermally altered subsurface material of asteroid (162173) Ryugu

Kitazato, Kohei*; Milliken, R. E.*; Iwata, Takahiro*; Abe, Masanao*; Otake, Makiko*; Matsuura, Shuji*; Takagi, Yasuhiko*; Nakamura, Tomoki*; Hiroi, Takahiro*; Matsuoka, Moe*; et al.

Nature Astronomy (Internet), 5(3), p.246 - 250, 2021/03

https://doi.org/10.1038/s41550-020-01271-2

Here we report observations of Ryugu's subsurface material by the Near-Infrared Spectrometer (NIRS3) on the Hayabusa2 spacecraft. Reflectance spectra of excavated material exhibit a hydroxyl (OH) absorption feature that is slightly stronger and peak-shifted compared with that observed for the surface, indicating that space weathering and/or radiative heating have caused subtle spectral changes in the uppermost surface. However, the strength and shape of the OH feature still suggests that the subsurface material experienced heating above 300 C, similar to the surface. In contrast, thermophysical modeling indicates that radiative heating does not increase the temperature above 200 C at the estimated excavation depth of 1 m, even if the semimajor axis is reduced to 0.344 au. This supports the hypothesis that primary thermal alteration occurred due to radiogenic and/or impact heating on Ryugu's parent body.

Study on engineering technologies in the Mizunami Underground Research Laboratory; FY2012 (Contract research)

Fukaya, Masaaki*; Noda, Masaru*; Hata, Koji*; Takeda, Yoshinori*; Akiyoshi, Kenji*; Ishizeki, Yoshikazu*; Kaneda, Tsutomu*; Sato, Shin*; Shibata, Chihoko*; Ueda, Tadashi*; et al.

JAEA-Technology 2014-019, 495 Pages, 2014/08

JAEA-Technology-2014-019.pdf:82.23MB

The researches on engineering technology in the Mizunami Underground Research Laboratory (MIU) plan consists of (1) research on engineering technology deep underground, and (2) research on engineering technology as a basis of geological disposal. The former research is mainly aimed in this study, which is categorized in (a) development of design and construction planning technologies, (b) development of construction technologies, (c) development of countermeasure technologies, and (d) development of technologies for security. In this study, the researches on engineering technology are being conducted in these four categories by using data measured during construction as a part of the second phase of the MIU plan.

The H-Invitational Database (H-InvDB); A Comprehensive annotation resource for human genes and transcripts

Yamasaki, Chisato*; Murakami, Katsuhiko*; Fujii, Yasuyuki*; Sato, Yoshiharu*; Harada, Erimi*; Takeda, Junichi*; Taniya, Takayuki*; Sakate, Ryuichi*; Kikugawa, Shingo*; Shimada, Makoto*; et al.

Nucleic Acids Research, 36(Database), p.D793 - D799, 2008/01

https://doi.org/10.1093/nar/gkm999

Here we report the new features and improvements in our latest release of the H-Invitational Database, a comprehensive annotation resource for human genes and transcripts. H-InvDB, originally developed as an integrated database of the human transcriptome based on extensive annotation of large sets of fulllength cDNA (FLcDNA) clones, now provides annotation for 120 558 human mRNAs extracted from the International Nucleotide Sequence Databases (INSD), in addition to 54 978 human FLcDNAs, in the latest release H-InvDB. We mapped those human transcripts onto the human genome sequences (NCBI build 36.1) and determined 34 699 human gene clusters, which could define 34 057 protein-coding and 642 non-protein-coding loci; 858 transcribed loci overlapped with predicted pseudogenes.

Fieldwork on nuclear energy in Oarai, 2; Analysis on questionnaire

Shinoda, Yoshihiko; Hayashizaki, Noriyosu*; Shioda, Akiko*; Yamano, Naoki*; Fujii, Yasuhiko*; Torii, Hiroyuki*

no journal, , 

The social research group of 21st century COE program carries out community experiments on mutual evoluation of companies in general, local community and nuclear technology. Oarai town of Ibaraki for community as the case study and it is the purpose of mutual evoluation to seek the nuclear technology utilizing Oarai town. In this study, we sent out questionnaire of awareness about Oarai town and energy issues toward visitor and analyzed it.

Beamline design of a single crystal neutron diffractometer SENJU

Oikawa, Kenichi; Ohara, Takashi*; Kiyanagi, Ryoji; Kawasaki, Takuro; Tamura, Itaru; Kaneko, Koji; Kimura, Hiroyuki*; Noda, Yukio*; Takahashi, Miwako*; Kiyotani, Tamiko*; et al.

no journal, , 

A new single crystal neutron diffractometer SENJU is now being built at a rapid rate in BL18 of MLF at J-PARC. The instrument realize measurements using small sample, less than 1.0 under combined special environment at 1 MW beam power. We designed the beamline specification considering sample size and its mosaicity, spacial resolution of the area detector, and so on. The concrete design input and their detailed investigation process of the beamline will be presented.

A New time-of-flight single crystal diffractometer SENJU at J-PARC

Oikawa, Kenichi; Ohara, Takashi*; Kiyanagi, Ryoji; Kawasaki, Takuro; Tamura, Itaru; Kaneko, Koji; Nakamura, Tatsuya; Sakasai, Kaoru; Nakao, Akiko*; Hanashima, Takayasu*; et al.

no journal, , 

SENJU, named after the thousand armed Goddess of Mercy, is a single crystal time-of-flight Laue diffractometer proposed to the MLF at J-PARC. The diffractometer is dedicated for precise crystal and magnetic structure analyses under the combined extreme conditions using a small sample less than 1 . TOF-Laue technique coupled with wide area 2D detectors enables the efficient measurements and improves the completeness of the data. A WLSF-type scintillator detector developed for iBIX was modified to meet the requirements of SENJU. Although the construction schedule has been delayed because of the earthquake, on-beam commissioning will start in 2012.

Commissioning and current status of the extreme environment single crystal neutron diffractometer SENJU

Kiyanagi, Ryoji; Ohara, Takashi*; Kawasaki, Takuro; Oikawa, Kenichi; Tamura, Itaru; Kaneko, Koji; Hanashima, Takayasu*; Nakao, Akiko*; Munakata, Koji*; Kimura, Hiroyuki*; et al.

no journal, , 

no abstracts in English

Structure analyses on the new TOF neutron single crystal diffractometer, SENJU

Kiyanagi, Ryoji; Ohara, Takashi*; Kawasaki, Takuro; Oikawa, Kenichi; Tamura, Itaru; Kaneko, Koji; Nakao, Akiko*; Hanashima, Takayasu*; Munakata, Koji*; Kimura, Hiroyuki*; et al.

no journal, , 

Development of a new TOF single crystal diffractometer SENJU at J-PARC

Ohara, Takashi; Kiyanagi, Ryoji; Kawasaki, Takuro; Oikawa, Kenichi; Kaneko, Koji; Tamura, Itaru; Nakao, Akiko*; Hanashima, Takayasu*; Munakata, Koji*; Kimura, Hiroyuki*; et al.

no journal, , 

SENJU is a new single crystal time-of-flight neutron diffractometer installed at BL18 of J-PARC. SENJU is designed for precise crystal and magnetic structure analyses under multiple extreme environments such as low-temperature, high-pressure and high-magnetic field, and also designed for diffraction measurements of small single crystals less than 1.0 mm in volume. We have successfully achieved structure analysis of a laboratory X-ray size (0.1 mm) single organic crystal, measurement and visualization of a complex-shape diffuse scattering pattern and measurement of higher order magnetic reflections in high-Q region (Q16 ) by using SENJU. Those results show that the performance of SENJU is as we expected.

Installation of additional detectors and T0 chopper on the single crystal neutron diffractometer, SENJU

Kiyanagi, Ryoji; Ohara, Takashi; Kawasaki, Takuro; Oikawa, Kenichi; Kaneko, Koji; Tamura, Itaru; Nakao, Akiko*; Hanashima, Takayasu*; Munakata, Koji*; Moyoshi, Taketo*; et al.

no journal, , 

The single crystal diffractometer, SENJU, which just became open for users, is the instrument designed to perform structure analyses under multiple extreme conditions even with tiny samples. Additional six detectors and T0 chopper were installed in order to improve the data collection efficiency and the background noise arises from the burst neutron. The solid angle covarage increased by 1.2 with the six new detectors, and significant reduction of the background noises were confirmed especially on the detectors at highest and lowest angles.