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-clustering in atomic nuclei from first principles with statistical learning and the Hoyle state characterOtsuka, Takaharu; Abe, Takashi*; Yoshida, Toru*; Tsunoda, Yusuke*; Shimizu, Noritaka*; Itagaki, Naoyuki*; Utsuno, Yutaka; Vary, J. P.*; Maris, P.*; Ueno, Hideki*
Nature Communications (Internet), 13, p.2234_1 - 2234_10, 2022/04
Times Cited Count：17 Percentile：95.19(Multidisciplinary Sciences)no abstracts in English
Tsunoda, Naofumi*; Otsuka, Takaharu; Takayanagi, Kazuo*; Shimizu, Noritaka*; Suzuki, Toshio*; Utsuno, Yutaka; Yoshida, Sota*; Ueno, Hideki*
Nature, 587, p.66 - 71, 2020/11
Times Cited Count：40 Percentile：92.47(Multidisciplinary Sciences)no abstracts in English
Al
ground stateHeylen, H.*; De Rydt, M.*; Neyens, G.*; Bissell, M. L.*; Caceres, L.*; Chevrier, R.*; Daugas, J. M.*; Ichikawa, Yuichi*; Ishibashi, Yoko*; Kamalou, O.*; et al.
Physical Review C, 94(3), p.034312_1 - 034312_5, 2016/09
Times Cited Count：37 Percentile：91.78(Physics, Nuclear)no abstracts in English
LiIshiyama, Hironobu*; Jeong, S.-C.*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Jung, H. S.*; Miyatake, Hiroari*; Oyaizu, Mitsuhiro*; Osa, Akihiko; Otokawa, Yoshinori; et al.
Nuclear Instruments and Methods in Physics Research B, 376, p.379 - 381, 2016/06
Times Cited Count：8 Percentile：60.26(Instruments & Instrumentation)Li tracerIshiyama, Hironobu*; Jeong, S.-C.*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Miyatake, Hiroari*; Oyaizu, Mitsuhiro*; Katayama, Ichiro*; Osa, Akihiko; Otokawa, Yoshinori; et al.
Japanese Journal of Applied Physics, 53(11), p.110303_1 - 110303_4, 2014/11
Times Cited Count：4 Percentile：18.17(Physics, Applied)
=20 shell in 
Al investigated through the ground-state electric quadrupole momentShimada, Kenji*; Ueno, Hideki*; Neyens, G.*; Asahi, Koichiro*; Balabanski, D. L.*; Daugas, J. M.*; Depuydt, M.*; De Rydt, M.*; Gaudefroy, L.*; Gr
vy, S.*; et al.
Physics Letters B, 714(2-5), p.246 - 250, 2012/08
Times Cited Count：7 Percentile：41.35(Astronomy & Astrophysics)no abstracts in English
Al and determination of the effective proton charge in the sd-shellDe Rydt, M.*; Neyens, G.*; Asahi, Koichiro*; Balabanski, D. L.*; Daugas, J. M.*; Depuydt, M.*; Gaudefroy, L.*; Grvy, S.*; Hasama, Yuka*; Ichikawa, Yuichi*; et al.
Physics Letters B, 678(4), p.344 - 349, 2009/07
Times Cited Count：17 Percentile：69.95(Astronomy & Astrophysics)no abstracts in English
Yoshikawa, Hideki; Ueno, Kenichi; Yui, Mikazu
Proceedings of Safety Cases for Deep Geological Disposal of Radioactive Waste; Where do we stand ?, p.365 - 371, 2008/00
Using X-ray computer tomography (X-CT), about 40 samples of archaeological irons, which were found at some Japanese ancient monuments with being buried underground for a few hundred to one thousand years, were analyzed for their corrosion depth to investigate long-term stability. The measured corrosion depths are more than one order of magnitude less than the design allowance of 40 mm, which supports that the designed corrosion allowance for an overpack is sufficiently conservative. Such archaeological study can provide useful evidences for long-term lifetime of a waste container which is an important element for making a robust safety case.
Yoshikawa, Hideki; Ueno, Kenichi; Yui, Mikazu
Proceedings of Safety Cases for Deep Geological Disposal of Radioactive Waste; Where do we stand ?, p.365 - 371, 2008/00
In the Japanese HLW safety case, a carbon steel container (overpack) was designed with a 1000 year lifetime, based on a corrosion allowance of 40 mm derived from laboratory data obtained under anaerobic conditions. Analogue studies have been conducted to increase confidence in the robustness of this design basis. Using X-ray computer tomography (X-CT) to measure corrosion rate, about 40 samples of iron archaeological artifacts, which were found at Japanese ancient monuments after burial underground for a few hundred to one thousand years, were analyzed. The their corrosion rates are more than one order of magnitude less than the design allowance of 40 mm / ka, which supports the argument that the designed corrosion allowance is conservative.
Miyahara, Kaname; Yoshikawa, Hideki; Ueno, Kenichi
Hoshasei Haikibutsu Anzen Kenkyu Nenji Keikaku (Heisei-13-Nendo
Heisei-17-Nendo) Kenkyu Seika Hokokushu, p.233 - 239, 2006/03
This report reviewed the natural analogue study on engineered barrier materials performed from 2001 to 2005 as safety study in JNC.
Kako, Eiji*; Noguchi, Shuichi*; Ouchi, Norihito*; Shishido, Toshio*; Akaoka, Nobuo*; Kobayashi, Hideki*; Ouchi, Nobuo; Ueno, Tomoaki*; Hara, Hiroshi*; Matsuoka, Masanori*; et al.
Proceedings of 9th European Particle Accelerator Conference (EPAC 2004) (CD-ROM), p.1042 - 1044, 2004/07
no abstracts in English
Ouchi, Norihito*; Kako, Eiji*; Noguchi, Shuichi*; Shishido, Toshio*; Tsuchiya, Kiyosumi*; Akaoka, Nobuo*; Kobayashi, Hideki*; Ouchi, Nobuo; Ueno, Tomoaki*; Hara, Hiroshi*; et al.
Proceedings of 9th European Particle Accelerator Conference (EPAC 2004), p.1033 - 1035, 2004/00
no abstracts in English
Hayashi, Maki*; Ueno, Kenichi; Yoshikawa, Hideki; Yui, Mikazu
JNC TN8400 2003-029, 33 Pages, 2003/11
JNC-TN8400-2003-029.pdf:3.55MB
The purpose of this study is to understand, experimentaly and analytically, the alteration-phase formation and associated elemetal release during aqueous corrosion of HLW glass in order to establish the evaluation and modeling of a more realistic long-term exudation action in disposal environment. Static deterioration tests were performed with a simulated HLW glass, P0798 glass, in solution pH is fixed on conditions (pH=11) and Na concentration is changed, the dissolution of glass and mineralization and the influence of Na concentration exerted on Cs exudation were evaluated. The solution concentrations of dissolved elements were measured by use of ICP-AAS , ICP-AES , ICP-MS , and the unreacted glass and reacted glass were analyzed by use of XRD and BET , electron microscope (SEM/EDS). The results indicated that; 1)Na-beidellite may generate in this experiment condition, 2)The glass dissolution proceeds in proportion to square root of time , it turns out that it is not dependent on Na concentration in solution on this experiment conditions, 3)Most of Cs in the glass is involved with the crystalline alteration-phases formation on the surface of glass.
Kurosawa, Masanori*; Ueno, Kenichi; Yoshikawa, Hideki; Yui, Mikazu
JNC TY8400 2003-005, 67 Pages, 2003/05
JNC-TY8400-2003-005.pdf:2.74MB
no abstracts in English
Yoshikawa, Hideki; Ueno, Kenichi; ; Honda, Takashi*; *
9th International Conference on Environmental Remediation Ra, 0 Pages, 2003/00
None
Yoshikawa, Hideki; Ueno, Kenichi; Honda, Takashi*; Yamaguchi, Shingo*; Yui, Mikazu
9th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM '03), 0 Pages, 2003/00
None
Nagae, Daisuke; Takemuara, Makoto*; Ueno, Hideki*; Kameda, Daisuke*; Asahi, Koichiro*; Yoshimi, Akihiro*; Sugimoto, Takashi*; Nagatomo, Takashi*; Kobayashi, Yoshio*; Uchida, Makoto*; et al.
no journal, ,
An electric quadrupole moment (
moment) is sensitive to collective aspects of nuclear structure. In the -moment measurement for unstable nuclei, we employ the 
-detected nuclear-quadrupole resonance method. In this method, we need to supply 
resonance frequencies, where 
denotes the nuclear spin. We have developed a new RF-application system to induced all of the transitions. The application of the frequencies may be pursued in two different ways; the sequential RF pulse method and the mixed-wave RF pulse method. We confirmed the reversal of polarization for the both methods, from measurements of -ray asymmetry change for polarized 
B. Using this system, the moments of 
Al have been measured to be 
mb and 
mb by the sequential RF pulse method.
Kai, Tetsuya; Seki, Masakazu; Ueno, Hideki; Kinoshita, Hidetaka; Otsu, Kiichi; Teshigawara, Makoto; Kogawa, Hiroyuki; Kasugai, Yoshimi
no journal, ,
Various radioactive nuclei are produced in the mercury circulation system of J-PARC spallation neutron source. It is required to minimize release of such volatile radioactivity as tritium (half-life of 12 years) and xenon-127 (half-life of 36 days) during works opening the mercury system to the atmosphere to replace a mercury target chamber, etc. Although a depuration process by helium-gas flushing is carried out to the mercury system, a disposal of large amount of produced gas would be an issue. Thus a test was performed to remove xenon-127 from the disposal gas. As a result the concentration of xenon-127 was successfully reduced down to one-hundredth after a 6-hour operation of a charcoal trap cooled by liquid-nitrogen. In addition desorption of xenon-127 was confirmed by heating the charcoal trap to 100 degree in Celsius. These test indicated that xenon-127 in off-gas can be well removed by using the cooled charcoal trap.
Kai, Tetsuya; Uchida, Toshitsugu; Kinoshita, Hidetaka; Seki, Masakazu; Ueno, Hideki; Haga, Katsuhiro; Kogawa, Hiroyuki; Wakui, Takashi; Naoe, Takashi; Takada, Hiroshi
no journal, ,
no abstracts in English
Tajima, Minori*; Takamine, Aiko*; Iimura, Hideki; Wada, Michiharu*; Schuessler, H. A.*; Ueno, Hideki*
no journal, ,
Collinear laser spectroscopy is widely used to measure the isotope shifts and the hyperfine structures of unstable nuclei, from which the change of charge radii and the electromagnetic moments of these nuclei are deduced. However, radioisotopes of refractory elements have not been measured, because it is difficult to generate the ion beams necessary for collinear laser spectroscopy. Recently, SLOWRI has been constructed at RIKEN RI beam facility (RIBF), which can afford the ion beams of radioisotopes of all elements. We are developing a collinear laser spectroscopy setup at SLOWRI. We have confirmed that the reference values of the isotope shifts and the hyperfine structure constants of stable Ba isotopes were obtained. Since the intensities of radioisotopes are much lower than those of stable isotopes, improvement of sensitivity by using such as ion-photon coincidence is now in progress.
