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AtSegawa, Mariko; Nishinaka, Ichiro*; Maeda, Makoto; Toh, Yosuke
no journal, ,
no abstracts in English
-ray analysisToh, Yosuke; Huang, M.; Segawa, Mariko; Maeda, Makoto; Tsuneyama, Masayuki*; Kimura, Atsushi; Nakamura, Shoji
no journal, ,
no abstracts in English
Takeuchi, Erina; Tomita, Jumpei; Ohara, Yoshiyuki
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no abstracts in English
Tokunaga, Kohei; Takahashi, Yoshio*; Kozai, Naofumi
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In the present study, we explore a new application of barite (BaSO
) as a sequestering phase for radioactive nuclides from aqueous solutions. Barite is a common phase in many geological environments, and it can be used to remove toxic and/or radioactive elements from aqueous solutions, but it has not been widely used in environmental studies. This study describes the mechanisms of SeO
, SeO, IO
, and Sr
distribution between barite and water, thus providing a good estimate of its ability to effectively remove these ions from aqueous solutions (more than 80%) using the optimized experimental parameters examined here.
Kusaka, Ryoji; Watanabe, Masayuki
no journal, ,
no abstracts in English
Osada, Naoyuki*; Ishizaki, Azusa; Nishizawa, Yukiyasu*; Yuki, Yoichi*; Sanada, Yukihisa
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no abstracts in English
Ouchi, Kazuki; Otobe, Haruyoshi; Kitatsuji, Yoshihiro
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We investigated differences in electrolytic deposition of U and Np. The electrodeposition of Np stopped when the electrode surface was covered with Np(IV) dioxide. This behavior is different from the deposition of U that the reaction continues even if deposits form on the electrode surface. From the result of impedance measurements of deposits, we found that the Np(IV) dioxide on the electrode surface prevent from reducing Np(V) to Np(IV) because of high electrical resistance of Np(IV) dioxide.
-rays from neutron induced fission of 
UMakii, Hiroyuki; Nishio, Katsuhisa; Hirose, Kentaro; Orlandi, R.; L
guillon, R.; Ogawa, Tatsuhiko; Soldner, T.*; Hambsch, F.-J.*; A
che, M.*; Astier, A.*; et al.
no journal, ,
The Japanese government has a plan to remove the fuel debirs for the full deconstruction of Fukushima I Nuclear Power Plants. The fuel debris must be removed without reaching criticality. However, it is difficult to monitor the fission rate due to the background rays coming from long-lived fission products. We are proposing to develop a system based on the use of the high-energy prompt fission rays, whose energies are high enough to be separated from the background. To design the system, it is essential to know the spectrum of prompt fission rays up to more than 7 MeV for U(
). So far, no data are available in the -ray energy range larger than 7 MeV. This prompted us to make a new measurement to extend the -ray spectrum limit to higher energies. The measurement has been carried out at the PF1b cold-neutron beam facility of the Institut Laue-Langevin. In this contribution we will present the results obtained the measurement.
Tokoi, Katsuyuki; Sato, Tetsuya; Eichler, R.*; Ito, Yuta; Tomitsuka, Tomohiro; Suzuki, Hayato*; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi*; Chiera, N. M.; et al.
no journal, ,
We developed a new experimental method combining vacuum chromatography and surface ionization, and applied this to investigate adsorption behavior of lawrencium (Lr, Z =103) on a surface of high temperature metallic tantalum. The adsorption behavior of Lr was similar to that of lutetium having low volatility among lanthanide elements. In this work, a Monte Carlo simulation code has been newly developed to study ionization and chromatographic behavior of short-lived atoms. In the presentation, we will report the details of a developed simulation code and calculation results.
Es targetAsai, Masato; Tsukada, Kazuaki; Hirose, Kentaro; Toyoshima, Atsushi; Tomitsuka, Tomohiro; Chiera, N. M.; Ito, Yuta; Makii, Hiroyuki; Nagame, Yuichiro; Nishio, Katsuhisa; et al.
no journal, ,
Spontaneous fissions of 
Fm, 
Fm, and 
Lr have been measured using an Es target at the JAEA Tandem Accelerator Facility. These three nuclei show different fission properties: the asymmetric fission, the high total-kinetic-energy (TKE) symmetric fission, and the low TKE symmetric fission, and the mechanisms of these three fissions should be very different. It is of great interest to elucidate how these differences occur. We have produced 
Fm in multinucleon-transfer reactions with a Es target and 
O projectiles, and produced Lr in the 
Cm(
N,4n) fusion-evaporation reaction. The reaction products were mass-separated with a gas-jet-coupled on-line isotope separator, and were delivered into a rotating wheel alpha- and fission-fragment detection system. By comparing the mass and TKE distributions deduced from the present experimental data, we will discuss the differences in fission mechanism among Fm, Fm, and Lr.
Satou, Yukihiko; Kobata, Masaaki; Okane, Tetsuo; Sueki, Keisuke*; Matsuo, Kazuki*; Ishii, Tatsuya*; Martin, P.*; Scott, T.*
no journal, ,
no abstracts in English
Tsukada, Kazuaki; Toyoshima, Atsushi; Hirose, Kentaro; Asai, Masato; Chiera, N. M.; Tokoi, Katsuyuki; Suzuki, Shinichi; Kashihara, Ayuna*; Ninomiya, Hidemi*
no journal, ,
no abstracts in English
Mo production yield by the acceleration neutronTsukada, Kazuaki; Nagai, Yasuki*; Hashimoto, Kazuyuki*; Kawabata, Masako*; Minato, Futoshi; Saeki, Hideya*; Motoishi, Shoji*; Watanabe, Satoshi*; Ito, Masatoshi*
no journal, ,
no abstracts in English
Tomitsuka, Tomohiro; Tokoi, Katsuyuki; Sato, Tetsuya; Ito, Yuta; Suzuki, Hayato*; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Chiera, N. M.; Goto, Shinichi*; et al.
no journal, ,
In order to experimentally determine the ground state electronic configurations of Superheavy element atoms, we have developed a slow Atomic Beam Source (ABS) using a high-temperature nozzle type cavity. In this study, we conducted an off-line experiment using stable isotopes of Cd to examine the extraction of the Cd beams. A symmetrical beam distribution with respect to the atomic beam edge was obtained. The obtained results, together with Monte-Carlo simulations for atomic beam profiles, will be presented.
Chiera, N. M.; Sato, Tetsuya; Asai, Masato; Suzuki, Hayato*; Tokoi, Katsuyuki; Tomitsuka, Tomohiro; Toyoshima, Atsushi; Tsukada, Kazuaki; Nagame, Yuichiro
no journal, ,
Yaita, Tsuyoshi; Suzuki, Shinichi; Kobayashi, Toru; Shiwaku, Hideaki; Doi, Reisuke; Yamagami, Hiroshi; Tsukada, Kazuaki; Toyoshima, Atsushi; Asai, Masato
no journal, ,
no abstracts in English