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-process nucleosynthesisBhattacharyya, A.*; Datta, U.*; Rahaman, A.*; Chakraborty, S.*; Aumann, T.*; Beceiro-Novo, S.*; Boretzky, K.*; Caesar, C.*; Carlson, B. V.*; Catford, W. N.*; et al.
Physical Review C, 104(4), p.045801_1 - 045801_14, 2021/10
Times Cited Count：7 Percentile：64.51(Physics, Nuclear)no abstracts in English
baryon spectrum from lattice QCD and effective theoryPavao, R.*; Gubler, P.; Fernandez-Soler, P.*; Nieves, J.*; Oka, Makoto; Takahashi, Toru*
Physics Letters B, 820, p.136473_1 - 136473_8, 2021/09
Times Cited Count：5 Percentile：57.81(Astronomy & Astrophysics)Lind, T.*; Pellegrini, M.*; Herranz, L. E.*; Sonnenkalb, M.*; Nishi, Yoshihisa*; Tamaki, Hitoshi; Cousin, F.*; Fernandez Moguel, L.*; Andrews, N.*; Sevon, T.*
Nuclear Engineering and Design, 376, p.111138_1 - 111138_12, 2021/05
Times Cited Count：18 Percentile：93.32(Nuclear Science & Technology)This is the third part of the three part paper describing the accidents at the FDNPS as analyzed in the Phase 2 of the OECD/NEA project "Benchmark Study of the Accident at the Fukushima Daiichi Nuclear Power Plant" (BSAF). In this paper, we describe the accident progression in unit 3. In the BSAF project, eight organizations from five countries analyzed severe accident scenarios for Unit 3 at the Fukushima Daiichi site using different severe accident codes. The present paper for Unit 3 describes the findings of the comparison of the participants' results against each other and against plant data, the evaluation of the accident progression and the final status inside the reactors. Special focus is on the status of the reactor pressure vessel, melt release and fission product release and transport. Unit 3 specific aspects, e.g., the complicated accident progression following repeated containment venting actuations and attempts at coolant injection at the time of the major core degradation, are highlighted and points of consensus as well as remaining uncertainties and data needs will be summarized. FP transport is analyzed, and the calculation results are compared with dose rate measurements in the containment. The release of I-131 and Cs-137 to the environment is compared with analysis conducted by using WSPEEDI code.
Sonnenkalb, M.*; Pellegrini, M.*; Herranz, L. E.*; Lind, T.*; Morreale, A. C.*; Kanda, Kenichi*; Tamaki, Hitoshi; Kim, S. I.*; Cousin, F.*; Fernandez Moguel, L.*; et al.
Nuclear Engineering and Design, 369, p.110840_1 - 110840_10, 2020/12
Times Cited Count：27 Percentile：95.77(Nuclear Science & Technology)This is the second paper in a series of 3 in which results of severe accident analyses for Unit 2 of Fukushima Daiichi are presented, gained in Phase 2 of the OECD/NEA project "Benchmark Study of the Accident at the Fukushima Daiichi Nuclear Power Plant (BSAF)". Nine organizations of six countries submitted results of their calculated severe accident scenarios for Unit 2 of Fukushima Daiichi using different severe accident codes. The present paper describes the findings of the comparison of the participants' results for Unit 2 against each other and against plant data, the evaluation of the accident progression and the final status inside the reactors. Special focus is on reactor pressure vessel status, melt release and fission product behavior and release. Unit 2 specific aspects will be highlighted and points of consensus as well as remaining uncertainties and data needs will be summarized.
Al via Coulomb breakupChakraborty, S.*; Datta, U.*; Aumann, T.*; Beceiro-Novo, S.*; Boretzky, K.*; Caesar, C.*; Carlson, B. V.*; Catford, W. N.*; Chartier, M.*; Cortina-Gil, D.*; et al.
Physical Review C, 96(3), p.034301_1 - 034301_9, 2017/09
Times Cited Count：4 Percentile：33.04(Physics, Nuclear)no abstracts in English
Roth, M.*; Alber, I.*; Bagnoud, V.*; Brown, C. R. D.*; Clarke, R.*; Daido, Hiroyuki; Fernandez, J.*; Flippo, K.*; Gaillard, S.*; Gauthier, C.*; et al.
Plasma Physics and Controlled Fusion, 51(12), p.124039_1 - 124039_7, 2009/12
Times Cited Count：31 Percentile：73.22(Physics, Fluids & Plasmas)Sekine, Yurina; Fukazawa, Tomoko*; Kobayashi, Riki*; Chi, S.*; Fernandez, J.*; Fukazawa, Hiroshi
no journal, ,
Hydrogels are unique materials that can contain a large amount of water in their three-dimensional polymer chain networks. We used neutron diffraction to probe the structure of D
O in poly-
,,-dimethylacrylamide (PDMAA) hydrogel. Two PDMAA hydrogels with high and low DO-content W (W = 0.9 and 0.5) were prepared. The neutron diffraction measurements were performed using the Wide Angle Neutron Diffractometer (WAND) at the High Flux Isotope Reactor in Oak Ridge, U.S.A. The samples were rapidly cooled using liquid nitrogen, and then heated from 10 to 300 K. The neutron diffraction profiles of the high DO-content PDMAA gel (W = 0.9) have strong sharp peaks below 270 K that are similar to diffraction patterns of hexagonal ice Ih. At 300 K, the profile has a broad liquid-like diffraction feature. The profile of the gel at W = 0.5 has a broad band in the 2
range from 20
- 28 below 230 K that are similar to diffraction pattern of glassy water. Sharp peaks are observed in the profile at 230 K. The feature of the profile is similar to that of cubic ice. The profile at 260 K has ice Ih-like strong peaks. Our neutron diffraction results show the existence of ice in hydrogels and that the structure of ice depends on the water content of the hydrogel. The structural changes of ice in hydrogels might have important implications in the interpretation of hydrogel properties, for both biological tissues and synthetic gel materials.
Alonso, J.*; Botija, J.*; Medrano, M.*; Rincon, E.*; Fernandez, P.*; Soleto, A.*; Kikuchi, Mitsuru; Matsukawa, Makoto; Masaki, Kei; Shibama, Yusuke
no journal, ,
no abstracts in English
Fernandez, M.*; Fujii, Satoshi*; Kono, Hidetoshi; Sarai, Akinori*
no journal, ,
Sekine, Yurina; Chi, S.*; Fernandez Baca, J.*; Fukazawa, Tomoko*; Fukazawa, Hiroshi
no journal, ,
Hydrogels are unique polymer materials consisting of large amount of water in their three-dimensional networks. The structure of water is an important factor governing the chemical and physical properties of gel materials. To investigate structure and properties of water in poly-N,N,-dimethylacrylamide (PDMAA) gel, neutron diffraction and differential scanning calorimetry (DSC) curve of the high (90wt%) and low (55wt%) DO content gels were measured. The neutron diffraction patterns show that amorphous, cubic, and hexagonal ices exist in the low DO content gel at low temperature, whereas only hexagonal ice exists in the high DO content gel. The DSC result shows that the low DO content gel contains only intermediate and bound water. In contrast, high DO content gel contains free, intermediate, and bound water. Therefore the results indicate that amorphous and cubic ices are only formed when the hydrogels do not have the free water.
Metoki, Naoto; Yamauchi, Hiroki; Watanuki, Ryuta*; Suzuki, Kazuya*; Hagihara, Masato*; Masuda, Takatsugu*; Matsuda, Masaaki*; Songxue, C.*; Fernandez Baca, J.*
no journal, ,
Our neutron scattering study and using representational analysis revealed the magnetic structure in phase II of NdB with Shastry-Sutherland lattice. We found that the magnetic structure is described by the mixture of the basis vector of 
and 
representation with the magnetic moment of about 2
. We observed pseudo-quartet CEF state and the temperature dependence by means of neutron inelastic scattering below 5 meV.
Metoki, Naoto; Yamauchi, Hiroki; Matsuda, Masaaki*; Fernandez Baca, J.*; Yoshida, Masahiro*; Yoshizawa, Hideki*; Hagihara, Masato*; Watanuki, Ryuta*
no journal, ,
We report the magnetic structures and propose the mechanism of the successive transition based on the 
-electron state revealed by CEF excitation. We confirmed the non-collinear `all-in all-out' structure () of the in-plane moment. We found that the magnetic moment along the 
-axis 
showed diagonally antiferromagnetic structure (
). The unusual magnetic ordering is phenomenologically understood via Landau theory. We also found that a long-period incommensurate modulation of the (
) antiferromagnetic structure of with the propagation 
= (0.14, 0.14, 0.1) and 
= (0.2, 0, 0.1) in phase III and IV, respectively. We found pseudo-quartet -electron state based on 
and 
. We can propose the intermediated phase as the magnetically ordered phase of 
while 
and 
coupling phase tabilized in low temperatures.
Sekine, Yurina; Chi, S.*; Fernandez Baca, J.*; Fukazawa, Tomoko*; Fukazawa, Hiroshi
no journal, ,
Neutron diffraction profiles of high and low- DO-content poly-N,N,-dimethylacrylamide (PDMAA) hydrogels were measured from 100 to 300 K to investigate the structure and properties of water in hydrogels. For high DO content hydrogel, strong sharp peaks are observed in 100 to 250 K. The feature of the peaks is similar to that of hexagonal ice (ice Ih). For low DO-content hydrogel, a broad band is observed at temperatures less than 220 K. The result indicates the existence of amorphous ice in the hydrogel. During the heating process, diffraction peaks from ice crystals appear in the profiles. The peaks indicate that cubic ice and hexagonal ice exist at temperatures above 220 K. We first obtained structure parameters of these ices in the hydrogel, which indicate the existence of low-density ice in the hydrogel.
