※ 半角英数字
 年 ~ 
検索結果: 130 件中 1件目~20件目を表示


Initialising ...



Initialising ...


Initialising ...


Initialising ...


Initialising ...


Initialising ...


Initialising ...


Initialising ...



Japanese Evaluated Nuclear Data Library version 5; JENDL-5

岩本 修; 岩本 信之; 国枝 賢; 湊 太志; 中山 梓介; 安部 豊*; 椿原 康介*; 奥村 森*; 石塚 知香子*; 吉田 正*; et al.

Journal of Nuclear Science and Technology, 60(1), p.1 - 60, 2023/01

 被引用回数:17 パーセンタイル:99.99(Nuclear Science & Technology)

The fifth version of Japanese Evaluated Nuclear Data Library, JENDL-5, was developed. JENDL-5 aimed to meet a variety of needs not only from nuclear reactors but also from other applications such as accelerators. Most of the JENDL special purpose files published so far were integrated into JENDL-5 with revisions. JENDL-5 consists of 11 sublibraries: (1) Neutron, (2) Thermal scattering law, (3) Fission product yield, (4) Decay data, (5) Proton, (6) Deuteron, (7) Alpha-particle, (8) Photonuclear, (9) Photo-atomic, (10) Electro-atomic, and (11) Atomic relaxation. The neutron reaction data for a large number of nuclei in JENDL-4.0 were updated ranging from light to heavy ones, including major and minor actinides which affect nuclear reactor calculations. In addition, the number of nuclei of neutron reaction data stored in JENDL-5 was largely increased; the neutron data covered not only all of naturally existing nuclei but also their neighbor ones with half-lives longer than 1 day. JENDL-5 included the originally evaluated data of thermal scattering law and fission product yield for the first time. Light charged-particle and photon induced reaction data were also included for the first time as the JENDL general purpose file.


Basic study on tritium monitor using plastic scintillator for treated water discharge at Fukushima Daiichi Nuclear Power Plant

眞田 幸尚; 阿部 智久; 佐々木 美雪; 菅野 麻里奈*; 山田 勉*; 中曽根 孝政*; 宮崎 信之*; 押切 圭介*; 渡部 浩司*

Journal of Nuclear Science and Technology, 10 Pages, 2023/00



The Optical potential for neutron-nucleus scattering derived by Bayesian optimization

渡辺 証斗*; 湊 太志; 木村 真明*; 岩本 信之

JAEA-Conf 2022-001, p.103 - 108, 2022/11

We are working on a combination of nuclear reaction calculation code CCONE and machine learning libraries to generate nuclear data and improve their accuracy. The angular distributions of elastic and inelastic scatterings to the first excited state on $$^{54}$$Fe at several incident energies were calculated using CCONE, and the optical potential parameters were optimized to reproduce the experimental data by Bayesian optimization. The optimized parameters were the depth of the real volume and imaginary surface parts of the potential, their energy dependence, radius, and diffuseness. Using the obtained optical potential, we estimated the angular distributions at energies different from those used on the optimization, and found that the results were in good agreement with the experiment data. In this presentation, we will introduce these calculation results and future prospects.


Nuclear data generation by machine learning, 1; application to angular distributions for nucleon-nucleus scattering

渡辺 証斗*; 湊 太志; 木村 真明*; 岩本 信之

Journal of Nuclear Science and Technology, 59(11), p.1399 - 1406, 2022/11

 被引用回数:0 パーセンタイル:0.01(Nuclear Science & Technology)

In order to increase the efficiency of nuclear data evaluation, we have tested a combination of a nuclear reaction model and machine learning algorithm. We calculated nucleon-nucleus elastic scattering angular distributions by using the nuclear reaction model code, and optimized the potential parameters of an optical model to reproduce experimental data by means of the Bayesian optimization. We present optimization cases with the single parameter and two or more parameters, and show that our framework gives the angular distributions which are in good agreement with the observed ones.


Development of blue diode laser for additive manufacturing

東野 律子*; 佐藤 雄二*; 升野 振一郎*; 菖蒲 敬久; 舟田 義則*; 阿部 信行*; 塚本 雅裕*

Laser 3D Manufacturing VII (Proceedings of SPIE Vol.11271), p.1127114_1 - 1127114_7, 2020/05

 被引用回数:5 パーセンタイル:95.37

We developed several blue diode lasers and applied laser metal deposition one of the additive manufacturing technologies. In order to investigate the amount of powder supplied and formation process of the copper layer, the process of forming a pure copper layer on SUS304 was observed using synchrotron X-ray. At 80 mg/s, it can be seen that a thicker pure copper layer is formed. It was confirmed that the pure copper thickness depended on the powder feed rate. It can be seen that the thickest layer is formed at a powder feed rate of 80 mg/s at a layer thickness at 40 ms. Based on the results obtained from copper layer, pure copper was stacked upward (direction Z) to form a pure copper wire. And since a thin molten pool was formed only in a limited area, it was observed that the molten pool was piled up with thin molten layer. It was melted to form a rod with 50 mm length for 25 second. It was confirmed that there were no pore in pure copper rod.


Magnetically induced electric polarization in Ba$$_{3}$$Fe$$_{2}$$O$$_{5}$$Cl$$_{2}$$ with tunable direction in three dimensions

阿部 伸行*; 塩澤 俊介*; 松浦 慧介*; 佐賀山 基*; 中尾 朗子*; 大原 高志; 徳永 祐介*; 有馬 孝尚*

Physical Review B, 101(18), p.180407_1 - 180407_5, 2020/05

 被引用回数:2 パーセンタイル:13.29(Materials Science, Multidisciplinary)

The correlation between magnetism and electric polarization in a chiral insulating magnet Ba$$_{3}$$Fe$$_{2}$$O$$_{5}$$Cl$$_{2}$$ has been investigated. The temperature dependence of magnetic susceptibility shows an anomaly at 564 K, suggesting the onset of antiferromagnetic order of Fe$$^{3+}$$ moments. Electric polarization appears in a magnetic field below TN due to the spin-direction-dependent metal-ligand hybridization. The direction of the electric polarization can be controlled in three-dimensional space by changing the direction of an external magnetic field. This compound also shows an antiferromagnetic-to-weak-ferromagnetic transition accompanied by a structural phase transition at 140 K.


JENDL/ImPACT-2018; A New nuclear data library for innovative studies on transmutation of long-lived fission products

国枝 賢; 古立 直也; 湊 太志; 岩本 信之; 岩本 修; 中山 梓介; 江幡 修一郎*; 吉田 亨*; 西原 健司; 渡辺 幸信*; et al.

Journal of Nuclear Science and Technology, 56(12), p.1073 - 1091, 2019/12

 被引用回数:6 パーセンタイル:67.25(Nuclear Science & Technology)

長寿命核分裂生成核種(LLFP)の核変換技術確立に向けた革新的研究開発に資することを目的とし、新たな核データライブラリJENDL/ImPACT-2018を開発した。開発した核データライブラリは主要なLLFPである$$^{79}$$Se, $$^{93}$$Zr, $$^{107}$$Pd, $$^{135}$$Csおよび周辺核種(計163核種)に対する中性子及び陽子入射の評価済核反応断面積がエネルギー200MeVを上限として格納されている。断面積の評価においては核反応モデルコードCCONEを用いると共に、測定データの乏しい核種やエネルギー領域の断面積を根拠を持って推定するために微視的な核構造理論を積極的に活用した。また、近年RIBF/RIKENにおいて逆運動学を用いて測定された測定データに基づいて主要な核反応モデルパラメータを最適化した。得られたデータは従来手法により求められた既存の核データライブラリJENDL-4.0/HEやTENDL-2017に比べて、安定核種に対する測定データをよく再現することを確認した。


Enhancement of element production by incomplete fusion reaction with weakly bound deuteron

Wang, H.*; 大津 秀暁*; 千賀 信幸*; 川瀬 頌一郎*; 武内 聡*; 炭竃 聡之*; 小山 俊平*; 櫻井 博儀*; 渡辺 幸信*; 中山 梓介; et al.

Communications Physics (Internet), 2(1), p.78_1 - 78_6, 2019/07

 被引用回数:7 パーセンタイル:56.64(Physics, Multidisciplinary)



In situ X-ray observations of pure-copper layer formation with blue direct diode lasers

佐藤 雄二*; 塚本 雅裕*; 菖蒲 敬久; 舟田 義則*; 山下 順広*; 原 崇裕*; 仙石 正則*; 左近 祐*; 大久保 友政*; 吉田 実*; et al.

Applied Surface Science, 480, p.861 - 867, 2019/06

 被引用回数:24 パーセンタイル:81.84(Chemistry, Physical)

A blue direct diode laser metal deposition system, which uses multiple lasers, was developed to realize a high-quality coating layer with a dense, fine structure and high purity. To clarify the formation mechanism of the pure copper layer, the formation process using a blue direct diode laser system was observed using in situ X-ray observations. The stainless steel 304 substrate melts, generating bubbles in the molten pool at a laser power density of 7.2 $$times$$ 10$$^{3}$$ W/cm$$^{2}$$ and a scanning speed of 3.0 mm/s. At a laser scanning speed of 9.0 mm/s, the bubbles disappear because only a slightly molten pool is formed on the surface of the substrate. The bubble amount and penetration depth depend on the laser input energy with a blue direct diode laser. By controlling the amount of input energy, a copper coating is produced minutely without a weld penetration.


Magnetic excitations in the orbital disordered phase of MnV$$_2$$O$$_4$$

松浦 慧介*; 佐賀山 基*; 上原 周*; 新居 陽一*; 梶本 亮一; 蒲沢 和也*; 池内 和彦*; Ji, S.*; 阿部 伸行*; 有馬 孝尚*

Physica B; Condensed Matter, 536, p.372 - 376, 2018/05

 被引用回数:2 パーセンタイル:10.5(Physics, Condensed Matter)

We have investigated the temperature dependence of magnetic dynamics in a spinel-type vanadium oxide MnV$$_2$$O$$_4$$ by inelastic neutron scattering. The scattering intensity of excitation around 20 meV disappears in the collinear intermediate-temperature cubic-ferrimagnetic phase, which reveals that this excitation should be peculiar to the orbital ordered phase. We have found a weakly dispersive mode emergent from a non-integer wavevector $$(1.4,1.4,0)$$ at 56 K, which lies in the cubic-ferrimagnetic phase between non-coplanar ferrimagnetic and paramagnetic phases. This indicates that the probable presence of an incommensurate instability in the simple collinear structure.


Preheat effect on titanium plate fabricated by sputter-free selective laser melting in vacuum

佐藤 雄二*; 塚本 雅裕*; 菖蒲 敬久; 山下 順広*; 山縣 秀人*; 西 貴哉*; 東野 律子*; 大久保 友政*; 中野 人志*; 阿部 信行*

Applied Physics A, 124(4), p.288_1 - 288_6, 2018/04

 被引用回数:17 パーセンタイル:64.16(Materials Science, Multidisciplinary)




長洲 亮佑*; 田邉 大次郎*; 横塚 享*; 熊沢 紀之*; 安食 貴也*; 相澤 雄介*; 長縄 弘親; 永野 哲志; 柳瀬 信之*; 三田村 久吉*; et al.

環境浄化技術, 17(2), p.58 - 61, 2018/03

原子力機構は、茨城大学, 熊谷組およびグループ会社であるテクノスとともに、森林からのセシウムの移行を抑制する新技術を開発した。この新技術では、ポリイオンと呼ばれるイオン性高分子と鉱物である粘土を併用し、降雨や雨水の流れといった自然の力を利用して、セシウムの移行を抑制する。福島県飯舘村で新規技術の実証試験を行い、森林から森林に隣接する牧草地へのセシウム移行に対する抑制効果を証明した。


Role of multichance fission in the description of fission-fragment mass distributions at high energies

廣瀬 健太郎; 西尾 勝久; 田中 翔也*; L$'e$guillon, R.*; 牧井 宏之; 西中 一朗*; Orlandi, R.; 塚田 和明; Smallcombe, J.*; Vermeulen, M. J.; et al.

Physical Review Letters, 119(22), p.222501_1 - 222501_6, 2017/12

 被引用回数:44 パーセンタイル:91.25(Physics, Multidisciplinary)

JAEAタンデム加速器施設で行った$$^{18}$$O+$$^{238}$$U反応における多核子移行チャンネルを用いた実験により、$$^{237-240}$$U, $$^{239-242}$$Np、および$$^{241-244}$$Puの核分裂質量分布を励起エネルギー10$$sim$$60MeVにおいて測定した。これらのうち、$$^{240}$$U, $$^{240,241,242}$$Npのデータは本実験により初めて観測された。原子核の殻効果の減衰によって対称分裂すると予想されていた高励起エネルギーにおいても、質量分布が非対称を示すことがわかった。搖動散逸定理に基づく動力学モデル計算との比較から、この振る舞いはマルチチャンス核分裂によるものであることを明らかにした。


Spin-orbital correlated dynamics in the spinel-type vanadium oxide MnV$$_{2}$$O$$_{4}$$

松浦 慧介*; 佐賀山 基*; 上原 周*; 新居 陽一*; 梶本 亮一; 蒲沢 和也*; 池内 和彦*; Ji, S.*; 阿部 伸行*; 有馬 孝尚*

Physical Review Letters, 119(1), p.017201_1 - 017201_6, 2017/07

 被引用回数:12 パーセンタイル:66.58(Physics, Multidisciplinary)

We investigate the magnetic dynamics in the spinel-type vanadium oxide MnV$$_2$$O$$_4$$. Inelastic neutron scattering around 10 meV and a Heisenberg model analysis have revealed that V$$^{3+}$$ spin-wave modes exist at a lower-energy region than previously reported. The scattering around 20 meV cannot be reproduced with the spin-wave analysis. We propose that this scattering could originate from the spin-orbital coupled excitation. This scattering is most likely attributable to V$$^{3+}$$ spin-wave modes, entangled with the orbital hybridization between $$t_{2g}$$ orbitals.


Overview of JENDL-4.0/HE and benchmark calculations

国枝 賢; 岩本 修; 岩本 信之; 湊 太志; 岡本 力; 佐藤 達彦; 中島 宏; 岩元 洋介; 岩元 大樹; 北谷 文人; et al.

JAEA-Conf 2016-004, p.41 - 46, 2016/09




石澤 明宏*; 井戸村 泰宏; 今寺 賢志*; 糟谷 直宏*; 菅野 龍太郎*; 佐竹 真介*; 龍野 智哉*; 仲田 資季*; 沼波 政倫*; 前山 伸也*; et al.

プラズマ・核融合学会誌, 92(3), p.157 - 210, 2016/03



Magnetoelectric coupling in the honeycomb antiferromagnet Co$$_{4}$$Nb$$_{2}$$O$$_{9}$$

Khanh, N. D.*; 阿部 伸行*; 佐賀山 基*; 中尾 朗子*; 花島 隆泰*; 鬼柳 亮嗣; 徳永 祐介*; 有馬 孝尚*

Physical Review B, 93(7), p.075117_1 - 075117_6, 2016/02

 被引用回数:94 パーセンタイル:95.16(Materials Science, Multidisciplinary)

The magnetic structure and magnetoelectric effect have been investigated for single crystals of the antiferromagnet Co$$_{4}$$Nb$$_{2}$$O$$_{9}$$. Single-crystal neutron diffraction and magnetic susceptibility measurement have revealed that the magnetic structure is different from a collinear arrangement with spin parallel to the trigonal axis as proposed previously. Co$$^{2+}$$ magnetic moments are found to be almost lying in the basal plane, which lowers the magnetic symmetry to $$C2/c'$$ with the propagation vector $$k$$ = 0. Associated with the magnetic phase transition, a sharp anomaly in the dielectric constant and displacement current indicate the appearance of the magnetoelectric below Neel temperature TN with a large coupling constant up to 30 ps/m. The existence of off-diagonal components in a magnetoelectric tensor indicate the formation of ferrotoroidic order in Co$$_{4}$$Nb$$_{2}$$O$$_{9}$$. Such a magnetoelectric effect can be ascribed to the reduction of symmetry caused by simple antiferromagnetic order in a honeycomb network.



渡辺 均; 中野 政尚; 藤田 博喜; 河野 恭彦; 井上 和美; 吉井 秀樹*; 大谷 和義*; 檜山 佳典*; 菊地 政昭*; 坂内 信行*; et al.

JAEA-Review 2015-030, 115 Pages, 2015/12




Sodium experiments on natural circulation decay heat removal and 3D simulation of plenum thermal hydraulics

上出 英樹; 小野 綾子; 木村 暢之; 遠藤 淳二*; 渡辺 収*

Proceedings of International Conference on Fast Reactors and Related Fuel Cycles; Safe Technologies and Sustainable Scenarios (FR-13), Companion CD (CD-ROM), 11 Pages, 2015/04



First measurement of the radionuclide purity of the therapeutic isotope $$^{67}$$Cu produced by $$^{68}$$Z($$n$$,$$x$$) reaction using $$^{rm nat}$$C($$d$$,$$n$$) neutrons

佐藤 望; 塚田 和明; 渡辺 智; 石岡 典子; 川端 方子; 佐伯 秀也; 永井 泰樹; 金 政浩*; 湊 太志; 岩本 信之; et al.

Journal of the Physical Society of Japan, 83(7), p.073201_1 - 073201_4, 2014/07

 被引用回数:13 パーセンタイル:64.28(Physics, Multidisciplinary)

本研究により、$$^{68}$$Zn($$n$$,$$x$$)$$^{67}$$Cu反応で生成される医療用放射性同位体$$^{67}$$Cuは、従来法による製造と比較して放射核的純度が非常に高いことが初めて明らかになった。実験は原子力機構高崎研究所のイオン照射研究施設において行われ、中性子源としてエネルギー41MeVの重陽子ビームによる$$^{rm nat}$$C(d,n)反応が用いられた。中性子照射後、高純度Ge検出器を用いて濃縮$$^{68}$$Zn試料の$$gamma$$線測定を行い、その結果から核反応生成物の放射能を評価した。生成された$$^{67}$$Cuに対する不純物核種の量は非常に少ないため、$$^{68}$$Znから$$^{67}$$Cuを化学分離する過程の簡略化や、高価な濃縮$$^{68}$$Zn試料の再利用が期待される。この研究結果は、高純度$$^{67}$$Cu製造に最適な反応系として$$^{68}$$Zn($$n$$,$$x$$)$$^{67}$$Cu反応を提案するものであり、$$^{67}$$Cuの製造法に関する長年の課題を解決できる可能性がある。

130 件中 1件目~20件目を表示