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nucleus 
NoAsai, Masato; Tsukada, Kazuaki; Sakama, Minoru*; Haba, Hiromitsu*; Ichikawa, Takatoshi*; Ishii, Yasuo; Toyoshima, Atsushi; Ishii, Tetsuro; Nishinaka, Ichiro; Nagame, Yuichiro; et al.
Physical Review C, 87(1), p.014332_1 - 014332_6, 2013/01
Times Cited Count：6 Percentile：43.66(Physics, Nuclear)The spin-parity and neutron configuration of the ground state of No have been identified through 
-decay spectroscopy. The No is the nucleus with the largest neutron number whose spin-parities and single-particle configurations have ever been identified. The neutron 9/2
[615] configuration was assigned to the ground state of No as well as to the 231.4 keV level in 
Fm. This allowed us to establish energy spacings and order of the neutron single-particle orbitals in such heaviest nuclear region. The appearance of the 9/2[615] ground state at 
=157 implies that the order of the neutron orbitals between the =152 and 162 deformed shell gaps should change considerably with increasing neutron number.
measurements of 
Pm, 
Sm, 
Eu, 
Gd and 
Tb using a total absorption BGO detectorHayashi, Hiroaki*; Akita, Yukinori*; Suematsu, Osamu*; Shibata, Michihiro*; Asai, Masato; Sato, Tetsuya; Ichikawa, Shinichi; Nishinaka, Ichiro; Nagame, Yuichiro; Osa, Akihiko; et al.
European Physical Journal A, 34(4), p.363 - 370, 2007/12
Times Cited Count：16 Percentile：71.35(Physics, Nuclear) values of Eu and Gd were measured for the first time using a total absorption BGO detector, and the data of Pm, Sm, and Tb obtained previously were reanalyzed. These nuclei were produced by the proton-induced fission of 
U at the JAEA-Tokai tandem accelerator facility, and separated from the reaction products using an on-line isotope separator. The deduced mass excesses and two-neutron separation energies were compared with those of atomic mass evaluations and theoretical predictions.
Takamura, Shuichi*; Kado, Shinichiro*; Fujii, Takashi*; Fujiyama, Hiroshi*; Takabe, Hideaki*; Adachi, Kazuo*; Morimiya, Osamu*; Fujimori, Naoji*; Watanabe, Takayuki*; Hayashi, Yasuaki*; et al.
Kara Zukai, Purazuma Enerugi No Subete, P. 164, 2007/03
no abstracts in English
Kikuchi, Mitsuru; Tamai, Hiroshi; Matsukawa, Makoto; Fujita, Takaaki; Takase, Yuichi*; Sakurai, Shinji; Kizu, Kaname; Tsuchiya, Katsuhiko; Kurita, Genichi; Morioka, Atsuhiko; et al.
Nuclear Fusion, 46(3), p.S29 - S38, 2006/03
Times Cited Count：13 Percentile：41.76(Physics, Fluids & Plasmas)The National Centralized Tokamak (NCT) facility program is a domestic research program for advanced tokamak research to succeed JT-60U incorporating Japanese university accomplishments. The mission of NCT is to establish high beta steady-state operation for DEMO and to contribute to ITER. The machine flexibility and mobility is pursued in aspect ratio and shape controllability, feedback control of resistive wall modes, wide current and pressure profile control capability for the demonstration of the high-b steady state.
Naito, Susumu*; Sano, Akira*; Izumi, Mikio*; Noda, Etsuo*; Hayashi, Kazuo*; Sato, Mitsuyoshi*; Suto, Osamu; Miyamoto, Yasuaki; Kondo, Shinichi*; Iinuma, Koichi*; et al.
Nuclear Science Symposium Conference Record, 2005 IEEE, Vol.1, p.495 - 499, 2005/10
An alpha radioactivity monitor (alpha-clearance monitor) is being developed to measure alpha radioactivity of uranium contaminated waste with large and complex surfaces. It uses an alpha radioactivity measurement method by collecting the air ionized by alpha particles using an air stream and by measuring its ion current. One of the major problems of the alpha-clearance monitor is the background ion current mainly by radon in atmosphere (
700 fA), which is much larger than ion current of an alpha particle (several fA). It strongly influences on the detection limit of alpha radioactivity. In order to improve the detection limit, we developed a method to monitor the radon concentration inside the monitor without the additional radon detector. In addition, the influencing factors on the detection limit: ion mobility and ion recombination coefficient were measured and evaluated on various environmental conditions (temperature, humidity and aerosol density).
Suzuki, Yoshio; Hayashi, Takaya*; Kishimoto, Yasuaki
Nuclear Fusion, 41(7), p.873 - 881, 2001/07
Times Cited Count：11 Percentile：35.66(Physics, Fluids & Plasmas)no abstracts in English
Suzuki, Yoshio; Hayashi, Takaya*; Kishimoto, Yasuaki
Earth Planets and Space, 53(6), p.547 - 551, 2001/06
Times Cited Count：2 Percentile：9.6(Geosciences, Multidisciplinary)no abstracts in English
Suzuki, Yoshio; Hayashi, Takaya*; Kishimoto, Yasuaki
Nuclear Fusion, 41(6), p.761 - 777, 2001/06
no abstracts in English
Miyamoto, Yoshiaki; Ogawa, Masuro; Akino, Norio; Shiina, Yasuaki; Inagaki, Yoshiyuki; Shimizu, Saburo; Onuki, Kaoru; Ishiyama, Shintaro; Katanishi, Shoji; Takeda, Tetsuaki; et al.
JAERI-Review 2001-006, 147 Pages, 2001/03
JAERI-Review-2001-006.pdf:9.2MB
no abstracts in English
Suzuki, Yoshio; Hayashi, Takaya*; Kishimoto, Yasuaki
Physics of Plasmas, 7(12), p.5033 - 5037, 2000/12
Times Cited Count：6 Percentile：21.01(Physics, Fluids & Plasmas)no abstracts in English
Suzuki, Yoshio; Hayashi, Takaya*; Miyoshi, Takahiro; Kishimoto, Yasuaki; NEXT Group
Purazuma, Kaku Yugo Gakkai-Shi, 76(3), p.288 - 294, 2000/03
no abstracts in English
EuSato, Tetsuya; Osa, Akihiko; Asai, Masato; Ichikawa, Shinichi; Tsukada, Kazuaki; Shibata, Michihiro*; Hayashi, Hiroaki*; Kojima, Yasuaki*
no journal, ,
no abstracts in English
Miyamoto, Yasuaki; Yamaguchi, Hiromi; Hayashi, Kazuo*; Tanaka, Motofumi*; Yasui, Hiroyuki*; Noda, Etsuo*
no journal, ,
no abstracts in English
-decay half-lives of four new neutron-rich isotopes 
Eu and levels in GdSato, Tetsuya; Asai, Masato; Osa, Akihiko; Tsukada, Kazuaki; Hayashi, Hiroaki*; Shibata, Michihiro*; Kojima, Yasuaki*; Ichikawa, Shinichi
no journal, ,
-decay half-lives of four new neutron-rich isotopes Eu produced in the proton-induced fission of U have been determined, using an on-line isotope separator at JAEA. The measured half-life values are 7.7(4) s for Eu, 4.6(7) s for 
Eu, 2.7(6) s for 
Eu and 1.7(4) s for Eu. And we determined the 
, 
energies of Gd
which is most neutron-rich Gd isotope to be 69.7(1) keV and 230.5(1) keV, respectively.
spectroscopy of N = 155 and 157 nuclei using a gas-jet transport techniqueAsai, Masato; Tsukada, Kazuaki; Sakama, Minoru*; Ishii, Yasuo; Toyoshima, Atsushi; Ishii, Tetsuro; Nishinaka, Ichiro; Nagame, Yuichiro; Kasamatsu, Yoshitaka; Haba, Hiromitsu*; et al.
no journal, ,
Alpha- spectroscopy of 
No and 
Rf nuclei with the neutron number N=155 and 157 have been performed for the first time at the JAEA tandem accelerator using a gas-jet transport technique. Spin-parities and neutron single-particle configurations of ground states of these nuclei as well as excited states in their daughter nuclei have been identified. On the basis of these experimental results, energy spacings and order of neutron single-particle orbitals between N=153 and 161 were evaluated. The result implies that the order of the neutron orbitals between N=153 and 161 should be inverted between lighter nuclei around 
Fm and heavier ones around 
Hs.
-decay half-life of new neutron rich isotope Eu and levels in GdSato, Tetsuya; Osa, Akihiko; Asai, Masato; Tsukada, Kazuaki; Hayashi, Hiroaki*; Shibata, Michihiro*; Kojima, Yasuaki*; Ichikawa, Shinichi
no journal, ,
New neutron-rich rare-earth isotope Eu produce in the proton-induced fisson of U were identified using the JAEA on-line isotope separator at the JAEA tandem accelerator and its half-life was determined to be 1.7(4) s. Excited state in Gd was established for the first time.
-ray spectroscopy of the heaviest nuclei at JAEA tandem acceleratorAsai, Masato; Tsukada, Kazuaki; Sakama, Minoru*; Ishii, Yasuo; Toyoshima, Atsushi; Ishii, Tetsuro; Nishinaka, Ichiro; Nagame, Yuichiro; Kasamatsu, Yoshitaka; Haba, Hiromitsu*; et al.
no journal, ,
Recent results on the -ray spectroscopic studies of the heaviest nuclei at the JAEA tandem accelerator are reviewed. The nuclei 
No, No, and Rf studied in the present work are the heaviest and the most neutron-rich nuclei that -ray spectroscopic studies have ever been performed for. Excited-state energies, spin-parities, and single-particle configurations of those nuclei and their daughters have been established by means of - coincidence spectroscopy. The deduced energy spacings and order of neutron single-particle orbitals suggest that the higher-order deformations play an important role in level structure of the superheavy nuclei in this region.
