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Xe ions on proton, deuteron, and carbon targetsSun, X. H.*; Wang, H.*; Otsu, Hideaki*; Sakurai, Hiroyoshi*; Ahn, D. S.*; Aikawa, Masayuki*; Fukuda, Naoki*; Isobe, Tadaaki*; Kawakami, Shunsuke*; Koyama, Shumpei*; et al.
Physical Review C, 101(6), p.064623_1 - 064623_12, 2020/06
Times Cited Count：5 Percentile：52.72(Physics, Nuclear)The spallation and fragmentation reactions of Xe induced by proton, deuteron and carbon at 168 MeV/nucleon were studied at RIKEN Radioactive Isotope Beam Factory via the inverse kinematics technique. The cross sections of the lighter products are larger in the carbon-induced reactions due to the higher total kinetic energy of carbon. The energy dependence was investigated by comparing the newly obtained data with previous results obtained at higher reaction energies. The experimental data were compared with the results of SPACS, EPAX, PHITS and DEURACS calculations. These data serve as benchmarks for the model calculations.
Wang, H.*; Otsu, Hideaki*; Chiga, Nobuyuki*; Kawase, Shoichiro*; Takeuchi, Satoshi*; Sumikama, Toshiyuki*; Koyama, Shumpei*; Sakurai, Hiroyoshi*; Watanabe, Yukinobu*; Nakayama, Shinsuke; et al.
Communications Physics (Internet), 2(1), p.78_1 - 78_6, 2019/07
Times Cited Count：8 Percentile：56.2(Physics, Multidisciplinary)Searching for effective pathways for the production of proton- and neutron-rich isotopes through an optimal combination of reaction mechanism and energy is one of the main driving forces behind experimental and theoretical nuclear reaction studies as well as for practical applications in nuclear transmutation of radioactive waste. We report on a study on incomplete fusion induced by deuteron, which contains one proton and one neutron with a weak binding energy and is easily broken up. This reaction study was achieved by measuring directly the cross sections for both proton and deuteron for 
Pd at 50 MeV/u via inverse kinematics technique. The results provide direct experimental evidence for the onset of a cross-section enhancement at high energy, indicating the potential of incomplete fusion induced by loosely-bound nuclei for creating proton-rich isotopes and nuclear transmutation of radioactive waste.
Nakayama, Shigeru*; Kawaguchi, Koichi; Segawa, Tomoomi; Yamada, Yoshikazu
Proceedings of 19th International Symposium on Artificial Life and Robotics (AROB 2014) (CD-ROM), p.246 - 249, 2014/01
In the nuclear fuel fabrication process, moisture content is very important parameter because of criticality safety control. Considering future commercial nuclear fuel fabrication plant, rapid and durable moisture sensor is required. We have developed an open-ended semi-coaxial microwave sensor to measure moisture involved in a substance. This sensor has no semiconductor tips, so it can be used in strong radiation field. In this paper, we carry out a preliminary experiment for measuring moisture of MOX(UO
+PuO) in granulation process, in which water is added as a binder. In our preliminary experiment, to simulate granulated MOX powder, granulated tungsten trioxide powder, which has similar dielectric constant to MOX and has voids to hold water inside, was used. The principle of microwave measurement of moisture is as follows. When the tungsten trioxide contained in a pyrex beaker is placed at the open end of the cavity, the resonant frequency is shifted by a variation in the end of capacitance which results from the difference in the dielectric constant of tungsten trioxide from that of air. Furthermore, the peak value of the resonance curve is attenuated by the absorption of microwave in the tungsten trioxide. Therefore, the moisture content of tungsten trioxide can be estimated by measuring either the frequency shift or attenuation. They are measured using a tracking generator and a spectrum analyzer. In our presentation, we will show the experimental results in detail.
Kono, Hidetoshi; Imanishi, Miki*; Negi, Shigeru*; Tatsutani, Kazuya*; Sakaeda, Yui*; Hashimoto, Ayaka*; Nakayama, Chie*; Futaki, Shiro*; Sugiura, Yukio*
FEBS Letters, 586(6), p.918 - 923, 2012/03
Times Cited Count：5 Percentile：14.71(Biochemistry & Molecular Biology)Hagiwara, Shigeru*; Sakamoto, Yoshiaki*; Takebe, Shinichi; Nakayama, Shinichi
JAERI-Data/Code 2004-004, 167 Pages, 2004/03
JAERI-Data-Code-2004-004.pdf:10.14MB
no abstracts in English
Hagiwara, Shigeru*; Sakamoto, Yoshiaki*; Takebe, Shinichi; Nakayama, Shinichi
JAERI-Data/Code 2004-003, 159 Pages, 2004/03
JAERI-Data-Code-2004-003.pdf:10.26MB
no abstracts in English
Hagiwara, Shigeru*; Sakamoto, Yoshiaki; Takebe, Shinichi; Ogawa, Hiromichi; Nakayama, Shinichi
JAERI-Review 2002-038, 107 Pages, 2002/12
JAERI-Review-2002-038.pdf:6.72MB
For the disposal of radioactive waste arising from radioactive utilization facilities and nuclear facilities, it is necessary to establish the disposal system in proportion to half-lives of radionuclides and radioactivity concentration in the waste. It is important to grasp the features of the earth scientific phenomena and geological structure of our country for the disposal system of radioactive waste. Then, for the porpose of the survey of the geological characteristics around the Japanese Islands whole neiborhood, the earth scientific phenomena at present, geological structure and geotectonic history were summarized on the basis of the existing literatures.
Hagiwara, Shigeru*; Sakamoto, Yoshiaki; Ogawa, Hiromichi; Nakayama, Shinichi
JAERI-Review 2002-024, 203 Pages, 2002/11
JAERI-Review-2002-024.pdf:15.79MB
Radioactive wastes arising from radioisotope facilities and nuclear research facilities should be disposed of in the surface of the earth, the shallow underground,the adequate depth and the deep undergruond according to radioactivity concentration, and should be managed during several hundreds years. For the selection of disposal site, it is necessary to survey the beginning of earth scientific phenomena observed in the Japanese Islands at present and to reconnoiter the prospective features. This report reviewed on the genesis and classification of sediments, earth scientific phenomena observed in the Japanese Islands and the feature of each place(10 districts) concerning to the Quaternary period in the newest geological time unit.
Nishitani, Takeo; Shikama, Tatsuo*; Sugie, Tatsuo; Kasai, Satoshi; Ishitsuka, Etsuo; Kawamura, Hiroshi; Kakuta, Tsunemi; Yagi, Toshiaki; Tanaka, Shigeru; Narui, Makoto*; et al.
JAERI-Research 2002-007, 149 Pages, 2002/03
JAERI-Research-2002-007.pdf:8.08MB
no abstracts in English
Iwata, Minoru*; Imai, Fumikazu*; Nakayama, Yoichi*; Imagawa, Kichiro*; Sugimoto, Masaki; Morishita, Norio; Tanaka, Shigeru
Proceedings of 23rd International Symposium on Space Technology and Science (ISTS-23), Vol.1, p.513 - 518, 2002/00
no abstracts in English
Nishihara, Kenji; Oigawa, Hiroyuki; Nakayama, Shinichi; Fujiwara, Takeshi; Kobayashi, Hidekazu; Kano, Shigeru; Sasage, Kenichi; Yamashita, Teruo; Ono, Kiyoshi; Shiotani, Hiroki
no journal, ,
The reduction of the storage facility and repository were evaluated for the cases with or without partitioning of Sr-Cs and transmutation of MA in the advanced FBR fuel cycle with the cost estimation for the storage facilities, transporting and repository. As the result, the transmutation of minor actinides is inevitable for the small repository because the heat generation by 
Am is considerable in FBR. The introduction of partitioning, transmutation and long-term storage enable the very compact layout in the repository like TRU wastes such as hulls and end-pieces of the fuel assembly. The cost for the storage and disposal in this case is much smaller than that in other cases, which mitigates the cost increase by the separation process and transmutor.
Sugaya, Atsushi; Horiguchi, Kenichi; Akutsu, Shigeru; Sato, Junya; Nakayama, Takuya; Kawato, Yoshimi; Meguro, Yoshihiro
no journal, ,
Cement solidification of sludge produced from contaminated water treatment by a coagulating sedimentation device was studied. Effect of water-to-cement ratio, loading rate, and components in the sludge on curing was investigated using simulated sludge. We have performed R&D work to apply cement solidification to the sludge and evaluated characteristics of solidification process with an eye towards the disposal as a basic study of waste treatment technology to prepare for the case if the sludge storage ability is not completely under safe conditions based on the results of long-term storage measure study. The results from these studies demonstrate that the simulated sludge can be successfully encapsulated by ordinary cement. We will investigate an allowance against variation of sludge constituents and characteristics and study a dissolution behavior of cesium and hazardous component from the waste form in the future.
Sato, Junya; Nakayama, Takuya; Suzuki, Shinji; Tomioka, Osamu; Kawato, Yoshimi; Sugaya, Atsushi; Horiguchi, Kenichi; Akutsu, Shigeru; Meguro, Yoshihiro
no journal, ,
no abstracts in English
Nakayama, Takuya; Sato, Junya; Suzuki, Shinji; Tomioka, Osamu; Kawato, Yoshimi; Sugaya, Atsushi; Horiguchi, Kenichi; Akutsu, Shigeru; Meguro, Yoshihiro
no journal, ,
no abstracts in English
Kuboki, Michikatsu; Naito, Masakazu; Sumi, Hirotaka; Nakayama, Jiro; Kano, Shigeru; Niitsuma, Koichi; Kodaka, Akira; Fujiwara, Koji
no journal, ,
no abstracts in English
