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論文

CIELO collaboration summary results; International evaluations of neutron reactions on uranium, plutonium, iron, oxygen and hydrogen

Chadwick, M. B.*; Capote, R.*; Trkov, A.*; Herman, M. W.*; Brown, D. A.*; Hale, G. M.*; Kahler, A. C.*; Talou, P.*; Plompen, A. J.*; Schillebeeckx, P.*; et al.

Nuclear Data Sheets, 148, p.189 - 213, 2018/02

 被引用回数:49 パーセンタイル:98.76(Physics, Nuclear)

CIELO国際協力では、原子力施設の臨界性に大きな影響を与える重要核種($$^{235}$$U, $$^{238}$$U, $$^{239}$$Pu, $$^{56}$$Fe, $$^{16}$$O, $$^{1}$$H)の中性子断面積データの精度を改善し、これまで矛盾していると考えられた点を解消することを目的として研究が行われた。多くの研究機関が参加したこのパイロットプロジェクトは、IAEAの支援も受けて、OECD/NEAの評価国際協力ワーキングパーティ(WPEC)のSubgroup 40として組織された。本CIELOプロジェクトは、新たな実験研究や理論研究を行う動機付けとなり、測定データを正確に反映し臨界性の積分テストに優れた新たな一連の評価済みライブラリとして結実した。本報告書は、これまでの研究成果と、本国際協力の次の段階の計画概要をまとめたものである。

論文

Atom-photon coupling from nitrogen-vacancy centres embedded in tellurite microspheres

Ruan, Y.*; Gibson, B. C.*; Lau, D. W. M.*; Greentree, A. D.*; Ji, H.*; Ebendorff-Heidepriem, H.*; Johnson, B. C.*; 大島 武; Monro, T. M.*

Scientific Reports (Internet), 5, p.11486_1 - 11486_7, 2015/06

 被引用回数:4 パーセンタイル:29.28(Multidisciplinary Sciences)

A technique for creating high quality tellurite microspheres with embedded nano-diamonds (NDs) containing nitrogen-vacancy (NV) centers was developed. TZN tellurite glass (TeO$$_{2}$$-ZnO-Na$$_{2}$$O) was fabricated in-house using the melt-quench technique and was formed to be glass fiber with a diameter of 0.16 mm. During this process, NDs with NV centers which were created by electron irradiation at 2 MeV were added into TZN tellurite glass above 690 $$^{circ}$$C. To obtain uniformly dispersed ND solutions, the NDs were processed using strong acid reflux and ultra-sonication before the mixture with TZN tellurite glass. This method can realize very bright fluorescence of the NVs in the NDs at room temperature. It is concluded that this new approach can be applied to a robust way of creating cavities for use in quantum and sensing applications.

論文

Nanodiamond in tellurite glass, 2; Practical nanodiamond-doped fibers

Ruan, Y.*; Ji, H.*; Johnson, B. C.*; 大島 武; Greentree, A. D.*; Gibson, B. C.*; Monro, T. M.*; Ebendorff-Heidepriem, H.*

Optical Materials Express (Internet), 5(1), p.73 - 87, 2015/01

 被引用回数:16 パーセンタイル:72.75(Materials Science, Multidisciplinary)

Tellurite glass fibers with embedded nanodiamond are attractive materials for quantum photonics applications. Reducing the loss of these fibers in the 600-800 nm wavelength range of nanodiamond fluorescence is essential to exploit the unique properties of nanodiamond in the new hybrid material. We reported the origin of loss in nanodiamond-doped glass and impact of glass fabrication conditions, as part I. In this study, we report the fabrication of nanodiamond-doped tellurite fibers with significantly reduced loss in the visible through further understanding of the impact of glass fabrication conditions on the interaction of the glass melt with the embedded nanodiamond. We fabricated nanodiamond with Nitrogen-Vacancy (NV) centers by 2 MeV electron irradiation at 1$$times$$10$$^{18}$$ /cm$$^{2}$$ and subsequent annealing at 800 $$^{circ}$$C. The nanodiamonds with NV centers were added into molten Tellurite glass. Tellurite fibers containing nanodiamond with concentrations up to 0.7 ppm-weight were fabricated, while reducing the loss by more than an order of magnitude down to 10 dB/m at 600-800 nm.

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