Precise determination of C level structure by -ray spectroscopy

Hosomi, Kenji; Ma, Y.*; Ajimura, Shuhei*; Aoki, Kanae*; Dairaku, Seishi*; Fu, Y.*; Fujioka, Hiroyuki*; Futatsukawa, Kenta*; Imoto, Wataru*; Kakiguchi, Yutaka*; et al.

Progress of Theoretical and Experimental Physics (Internet), 2015(8), p.081D01_1 - 081D01_8, 2015/08

https://doi.org/10.1093/ptep/ptv113

Level structure of the C hypernucleus was precisely determined by means of -ray spectroscopy. We identified four -ray transitions via the C reaction using a germanium detector array, Hyperball2. The spacing of the ground-state doublet was measured to be (stat) (syst)keV from the direct transition. Excitation energies of the and states were measured to be , keV and , keV, respectively. The obtained level energies provide definitive references for the reaction spectroscopy of hypernuclei.

Development of the irradiation method for the first instar silkworm larvae using locally targeted heavy-ion microbeam

Fukamoto, Kana; Shirai, Koji*; Sakata, Toshiyuki*; Sakashita, Tetsuya; Funayama, Tomoo; Hamada, Nobuyuki*; Wada, Seiichi*; Kakizaki, Takehiko; Shimura, Sachiko*; Kobayashi, Yasuhiko; et al.

Journal of Radiation Research, 48(3), p.247 - 253, 2007/05

https://doi.org/10.1269/jrr.06066

To carry out the radio-microsurgery study using silkworm, , we have already developed the specific irradiation systems for eggs and third to fifth instar larvae. In this study, a modified application consisting of the first instar silkworm larvae was further developed using heavy-ion microbeams. This system includes aluminum plates with holes specially designed to fix the first instar silkworm larvae during irradiation, and Mylar films were used to adjust energy deposited for planning radiation doses at certain depth. Using this system, the suppression of abnormal proliferation of epidermal cells in the knob mutant was examined. Following target irradiation of the knob-forming region at the first instar stage with 180-mum-diameter microbeam of 220 MeV carbon (C) ions, larvae were reared to evaluate the effects of irradiation. The results indicated that the knob formation at the irradiated segment was specially suppressed in 5.9, 56.4, 66.7 and 73.6 % of larvae irradiated with 120, 250, 400 and 600 Gy, respectively, but the other knob formations at the non-irradiated segments were not suppressed in either irradiation. Although some larva did not survive undesired non-targeted exposure, our present results indicate that this method would be useful to investigate the irradiation effect on a long developmental period of time. Moreover, our system could also be applied to other species by targeting tissues, or organs during development and metamorphosis in insect and animals.

Process of cyst formation from the implanted larval integument in the sweet potato hornworm, ; A Simple model for studying wound healing

Fukamoto, Kana; Shirai, Koji*; Sato, Shigeru*; Kanekatsu, Rensuke*; Kiguchi, Kenji*; Kobayashi, Yasuhiko

Journal of Insect Biotechnology and Sericology, 75(3), p.99 - 106, 2006/10

https://doi.org/10.11416/jibs.75.99

no abstracts in English

Oxidation resistance of silicon coated by boron nitride ultra thin film

Shimoyama, Iwao; Miyauchi, Hideo*; Baba, Yuji; Sekiguchi, Tetsuhiro; Hirao, Norie*; Okuno, Kenji*

JAEA-Research 2006-039, 33 Pages, 2006/06

JAEA-Research-2006-039.pdf:2.98MB

Boron nitride (BN) ultrathin film attracts much attention as a coating material for Si cathode due to the chemical stability, heat resistance, and negative electron affinity. In order to study the oxidation resistance of BN ultrathin film coating, thermal dry oxidation is applied to BN coated Si and non-coated Si at various temperatures. X-ray photoelectron spectroscopy is devoted to clarify the modification of chemical state of the samples. The XPS spectra change by the thermal oxidation for the non-coated Si. On the other hand, it scarcely change by the thermal oxidation for the BN coated Si. The oxidation resistance in ambient air is also investigated for BN coated Si. After the several days exposure of air, the O 1s photoelectron peak is drastically enhanced. These results mean that BN ultrathin film works as protective coating for dry thermal oxidation, however it does not work in ambient air.

Characterization of B-C-N hybrid prepared by ion implantation

Shimoyama, Iwao; Baba, Yuji; Sekiguchi, Tetsuhiro; Nath, K. G.; Sasaki, Masayoshi*; Okuno, Kenji*

Journal of Vacuum Science and Technology A, 21(6), p.1843 - 1848, 2003/11

https://doi.org/10.1116/1.1611887

Ion implantation method is applied to synthesize B-C-N hybrids and their electronic structures are characterized by X-ray photoelectron spectroscopy. A boron nitride film is deposited on a graphite target by borazine plasma implantation. At the interface between the BN film and the graphite, variety of bonding combinations including B-N, B-C, and C-N are observed. This proved that B-C-N hybrids is formed by this method.

Regeneration of hemopoietic organs in the silkworm, , after locally targeted irradiation with heavy ion beams

Ling, E.*; Fukamoto, Kana*; Xu, S.*; Shirai, Koji*; Kanekatsu, Rensuke*; Kobayashi, Yasuhiko; Tu, Z.; Funayama, Tomoo; Watanabe, Hiroshi; Kiguchi, Kenji*

Journal of Insect Biotechnology and Sericology, 72(2), p.95 - 100, 2003/09

https://doi.org/10.11416/jibs.72.95

no abstracts in English

Irradiation effect of different heavy ions and track section on the silkworm

Tu, Z.; Kobayashi, Yasuhiko; Kiguchi, Kenji*; Watanabe, Hiroshi

Nuclear Instruments and Methods in Physics Research B, 206, p.591 - 595, 2003/05

https://doi.org/10.1016/S0168-583X(03)00842-5

no abstracts in English

Effects of heavy-ion radiosurgery on the hemopoietic function of the silkworm

Tu, Z.; Kobayashi, Yasuhiko; Kiguchi, Kenji*; Watanabe, Hiroshi; Yamamoto, Kazuo*

Journal of Radiation Research, 43(3), p.269 - 275, 2002/11

https://doi.org/10.1269/jrr.43.269

no abstracts in English

Fate mapping of the cellular blastoderm stage egg of the silkworm, , by localized irradiation of heavy ion microbeams

Kiguchi, Kenji*; Kinjo, Y.*; Masahashi, K.*; Tu, Z.; Tamura, Hajime*; Shirai, K.*; Kanekatsu, Rensuke*; Kobayashi, Yasuhiko; Taguchi, Mitsumasa; Watanabe, Hiroshi

JAERI-Review 2000-024, TIARA Annual Report 1999, p.51 - 53, 2000/10

https://doi.org/10.11484/jaeri-review-2000-024

no abstracts in English

Cell surgery applications of heavy ion microbeams

Kobayashi, Yasuhiko; Taguchi, Mitsumasa; Watanabe, Hiroshi; Yamamoto, Kazuo*; Yamasaki, Shuhei*; Tu, Z. L.*; Kinjo, Y.*; Kiguchi, Kenji*

Proceedings of 11th International Congress of Radiation Research (ICRR-11), 2, p.182 - 186, 2000/00

no abstracts in English