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F from 
O
?Tang, T. L.*; Uesaka, Tomohiro*; Kawase, Shoichiro; Beaumel, D.*; Dozono, Masanori*; Fujii, Toshihiko*; Fukuda, Naoki*; Fukunaga, Taku*; Galindo-Uribarri, A.*; Hwang, S. H.*; et al.
Physical Review Letters, 124(21), p.212502_1 - 212502_6, 2020/05
Times Cited Count：14 Percentile：73.46(Physics, Multidisciplinary)The structure of a neutron-rich F nucleus is investigated by a quasifree (
) knockout reaction. The sum of spectroscopic factors of 
orbital is found to be 1.0 
0.3. The result shows that the O core of F nucleus significantly differs from a free O nucleus, and the core consists of 
35% O
, and 65% excited O. The result shows that the O core of F nucleus significantly differs from a free O nucleus. The result may infer that the addition of the 
proton considerably changes the neutron structure in F from that in O, which could be a possible mechanism responsible for the oxygen dripline anomaly.
Sakanaka, Shogo*; Akemoto, Mitsuo*; Aoto, Tomohiro*; Arakawa, Dai*; Asaoka, Seiji*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; et al.
Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.2338 - 2340, 2010/05
Future synchrotron light source using a 5-GeV energy recovery linac (ERL) is under proposal by our Japanese collaboration team, and we are conducting R&D efforts for that. We are developing high-brightness DC photocathode guns, two types of cryomodules for both injector and main superconducting (SC) linacs, and 1.3 GHz high CW-power RF sources. We are also constructing the Compact ERL (cERL) for demonstrating the recirculation of low-emittance, high-current beams using above-mentioned critical technologies.
Konomura, Mamoru; Ogawa, Takashi; Okano, Yasushi; Yamaguchi, Hiroyuki; Murakami, Tsutomu; Takaki, Naoyuki; Nishiguchi, Youhei; Sugino, Kazuteru; Naganuma, Masayuki; Hishida, Masahiko; et al.
JNC TN9400 2004-035, 2071 Pages, 2004/06
JNC-TN9400-2004-035.pdf:76.42MB
The attractive concepts for Sodium-, lead-bismuth-, helium- and water-cooled FBRs have been created through using typical plant features and employing advanced technologies. Efforts on evaluating technological prospects of feasibility have been paid for these concepts. Also, it was comfirmed if these concepts satisfy design requierments of capability and performance presumed in the feasibilty study on commertialization of Fast Breeder Reactor Systems. As results, it was concluded that the selection of sodium-cooled reactor was most rational for practical use of FBR technologies in 2015.
Kurata, Masaki; Nakamura, Kinya*; Yamada, Wataru*; Koyama, Toshiyuki*; Takaki, Tomohiro*; Nanko, Makoto*; Tokunaga, Tatsuya*
no journal, ,
A METI project is ongoing to develop multi scale and multi physics models and databases for elucidating fuel degradation mechanism in severe accident under collaboration among JAEA, CRIEPI, NSSMC, and universities. In JFY2012, technology investigation and model calculation were performed. Base MPFM was developed to study liquefaction condition in mesoscale. Combination between VOF and FLUENT shows high technical potential to simulate candling. A copling among VOF, FLUENT and MARC shows the high technical potential to simulate real scale fuel assembly degradation. As for thermodynamic database, various concerns were extracted from model calculation using conventional database like NUCLEA. In the project, not only developing models and databases but also constructing test facilities are planned. In JFY2012, preliminal tests were performed using conventional test apparatuses and basic concepts for three test facilities to be developed were extracted.
Kurata, Masaki; Nakamura, Kinya*; Tanaka, Masahiro*; Koyama, Toshiyuki*; Takaki, Tomohiro*; Tokunaga, Tatsuya*; Nanko, Makoto*
no journal, ,
The outline and the present status of METI project entitled Advanced Multi-scale Modeling and Experimental Tests on Fuel Degradation in Severe Accident Condition are overviewed.
Sitompul, Y.*; Aoki, Takayuki*; Watanabe, Seiya*; Sugihara, Kenta; Takaki, Tomohiro*
no journal, ,
A cumulant Lattice Boltzmann Method (LBM) with Multiphase Field (MPF) and Adaptive Mesh Refinement (AMR) has been developed to model foam formation with stable thin liquid films. The proposed method has been successfully employed to simulate 3D foam formation with many bubbles, maintaining mass conservation and using a large density ratio. In addition, we have extended the proposed method to include heat transfer calculations. To demonstrate the effectiveness of the foam as a thermal insulation layer, we simulated 2D foam formation and compared the heat transfer in a cup of water with and without foam. Preliminary results show that the foam effectively acts as a thermal insulator, retaining the water temperature by preventing the natural air convection and acting like a stagnant air layer.
Sitompul, Y.; Aoki, Takayuki*; Watanabe, Seiya*; Sugihara, Kenta; Takaki, Tomohiro*
no journal, ,
Foam formation and its thermal insulation properties are crucial in various industries. This study presents a numerical approach using the Cumulant Lattice Boltzmann Method (LBM) with Multiphase Field (MPF) to simulate foam formation and investigate its thermal insulation characteristics. The cumulant LBM is employed for stable and efficient hydrodynamics simulation using parallel computers. The MPF model allows the simulation of multiple bubble interfaces in a single cell, thus preventing bubble coalescence. To study the heat transport through the foam, we focus on a scenario involving a cup of hot water cooled by cold air. Without foam, heat transport is accelerated by forced air convection and natural convection in water. However, when foam is present, it acts as a stagnant air layer. The heat is transported primarily through conduction within the foam. The foam serves as an efficient thermal insulator, impeding convective heat transfer and prolonging the retention of hot water temperature.
