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Hashikura, Yasuaki*; Ishijima, Yasuhiro; Nakahara, Masaumi; Sano, Yuichi; Ueno, Fumiyoshi; Abe, Hitoshi
Hozengaku, 19(3), p.95 - 102, 2020/10
A plutonium concentrator was selected, and constant load tensile tests with controlled applied potentials and electrochemical tests were conducted in nitric acid and sodium nitrate solutions. From the results, a map which shows the effect of nitric acid concentration to crack initiation potential was drawn. And, it was pointed out that not only the nitric acid but also the nitrate ion coordinated to the nitrate must be considered in evaluating the possibility of stress corrosion cracking.
Hirata, Yosuke*; Nakahara, Katsuhiko*; Sano, Akira*; Sato, Mitsuyoshi*; Aoyama, Yoshio; Miyamoto, Yasuaki; Yamaguchi, Hiromi; Nambu, Kenichi*; Takahashi, Hiroyuki*; Oda, Akinori*
Journal of Power and Energy Systems (Internet), 2(2), p.561 - 572, 2008/00
Hirata, Yosuke*; Nakahara, Katsuhiko*; Sano, Akira*; Sato, Mitsuyoshi*; Aoyama, Yoshio; Miyamoto, Yasuaki; Yamaguchi, Hiromi; Nambu, Kenichi*; Takahashi, Hiroyuki*; Oda, Akinori*
Proceedings of 15th International Conference on Nuclear Engineering (ICONE-15) (CD-ROM), 6 Pages, 2007/04
no abstracts in English
Am and its EC-decay daughter 
PuAsai, Masato; Sakama, Minoru*; Tsukada, Kazuaki; Ichikawa, Shinichi; Haba, Hiromitsu*; Nishinaka, Ichiro; Nagame, Yuichiro; Goto, Shinichi*; Kojima, Yasuaki*; Oura, Yasuji*; et al.
European Physical Journal A, 23(3), p.395 - 400, 2005/02
Times Cited Count：16 Percentile：71.27(Physics, Nuclear)The EC decay of Am has been studied through 
-ray spectroscopy. Two EC-decaying states have been found in Am with half-lives of 3.6 min and 2.9 min. In Pu, we have found the 
octupole band and two-quasiparticle states one of which is a 
isomer with a 1.2 
s half-life. The EC transitions from Am to the two-quasiparticle states in Pu show small 
values of 4.8--5.3, which allowed us to assign proton-neutron configurations of Am and the two-quasiparticle states.
decays of 
AmAsai, Masato; Sakama, Minoru*; Tsukada, Kazuaki; Ichikawa, Shinichi; Haba, Hiromitsu*; Nishinaka, Ichiro; Nagame, Yuichiro; Goto, Shinichi*; Kojima, Yasuaki*; Oura, Yasuji*; et al.
European Physical Journal A, 22(3), p.411 - 416, 2004/12
Times Cited Count：9 Percentile：51.36(Physics, Nuclear)EC and decays of Am have been studied by means of -ray spectroscopy. Excited states in Pu have been established for the first time, and tentative spin-parity and Nilsson assignments were given to these levels. The ground state of Am was evaluated to be the ![$$pi 5/2^{-}[523]$$](/search/images/EROHA0JAGUXTEXT1FV4VWNJSGNOSI.gif)
state from the experimental results. It was found that the state in 
Np is located at 
15~keV, which allowed us to determine the 
value of Am as 6569
~keV, in combination with the measured -particle energy.
-decays of neutron-deficient americium isotopesSakama, Minoru*; Asai, Masato; Tsukada, Kazuaki; Ichikawa, Shinichi; Nishinaka, Ichiro; Nagame, Yuichiro; Haba, Hiromitsu*; Goto, Shinichi*; Shibata, Michihiro*; Kawade, Kiyoshi*; et al.
Physical Review C, 69(1), p.014308_1 - 014308_11, 2004/01
Times Cited Count：21 Percentile：73.68(Physics, Nuclear)no abstracts in English
Sakama, Minoru*; Tsukada, Kazuaki; Asai, Masato; Ichikawa, Shinichi; Haba, Hiromitsu; Goto, Shinichi*; Nishinaka, Ichiro; Nagame, Yuichiro; Oura, Yasuji*; Kojima, Yasuaki*; et al.
Journal of Nuclear Science and Technology, 39(Suppl.3), p.34 - 37, 2002/11
no abstracts in English
decays of neutron-deficient transuranium isotopesAsai, Masato; Sakama, Minoru; Tsukada, Kazuaki; Ichikawa, Shinichi; Haba, Hiromitsu; Nishinaka, Ichiro; Nagame, Yuichiro; Goto, Shinichi; Kojima, Yasuaki*; Oura, Yasuji*; et al.
Journal of Nuclear Science and Technology, 39(Suppl.2), p.474 - 477, 2002/08
Neutron-deficient americium and curium isotopes with half-lives 
10 min have been produced with the tandem accelerator, and their EC and weak decays have been successfully measured through an on-line isotope separation. Decay schemes of 
Am have been established, and proton-neutron configurations in the parent and daughter nuclei have been determined. Observed transitions in 
Am were found to be the favored transitions between the Nilsson states. Information on nuclear structure, deformation, and atomic masses in this region were obtained.
Asai, Masato; Sakama, Minoru*; Tsukada, Kazuaki; Ichikawa, Shinichi; Haba, Hiromitsu; Nishinaka, Ichiro; Nagame, Yuichiro; Goto, Shinichi*; Akiyama, Kazuhiko; Toyoshima, Atsushi; et al.
Journal of Nuclear and Radiochemical Sciences, 3(1), p.187 - 190, 2002/06
EC and decays of neutron-deficient americium, curium, and berkelium nuclei have been studied using the JAERI on-line isotope separator. Decay schemes of 
Am have been established for the first time, and proton-neutron configurations in Am and Pu have been determined. transitions observed in 
Am were found to be the favored transitions between the Nilsson states. values of 
Cm have been determined. Nuclear structure, deformation, and atomic masses for these nuclei were discussed.
AmSakama, Minoru*; Tsukada, Kazuaki; Asai, Masato; Ichikawa, Shinichi; Haba, Hiromitsu; Goto, Shinichi*; Oura, Yasuji*; Nishinaka, Ichiro; Nagame, Yuichiro; Shibata, Michihiro*; et al.
European Physical Journal A, 9(3), p.303 - 306, 2000/11
Times Cited Count：17 Percentile：66.14(Physics, Nuclear)no abstracts in English
Asai, Masato; Sakama, Minoru*; Tsukada, Kazuaki; Ichikawa, Shinichi; Haba, Hiromitsu; Nishinaka, Ichiro; Nagame, Yuichiro; Goto, Shinichi*; Kojima, Yasuaki*; Oura, Yasuji*; et al.
AIP Conference Proceedings 561, p.358 - 367, 2000/09
no abstracts in English
Maruyama, Tomoyuki*; Niita, Koji*; Maruyama, Toshiki; Chiba, Satoshi; Nakahara, Yasuaki; Iwamoto, Akira
Progress of Theoretical Physics, 96(1), p.263 - 268, 1996/07
Times Cited Count：22 Percentile：83.83(Physics, Multidisciplinary)no abstracts in English
Niita, Koji*; Chiba, Satoshi; Maruyama, Toshiki; Maruyama, Tomoyuki*; Takada, Hiroshi; Fukahori, Tokio; Nakahara, Yasuaki; Iwamoto, Akira
Physical Review C, 52(5), p.2620 - 2635, 1995/11
Times Cited Count：346 Percentile：99.52(Physics, Nuclear)no abstracts in English
Fukahori, Tokio; Chiba, Satoshi; Takada, Hiroshi; Nakahara, Yasuaki; Watanabe, Yukinobu*
Nihon Genshiryoku Gakkai-Shi, 37(4), p.264 - 273, 1995/00
Times Cited Count：0 Percentile：2.38(Nuclear Science & Technology)no abstracts in English
Takada, Hiroshi; *; Yoshizawa, Nobuaki*; Nakahara, Yasuaki
Journal of Nuclear Science and Technology, 31(1), p.80 - 82, 1994/01
Times Cited Count：1 Percentile：26.96(Nuclear Science & Technology)no abstracts in English
Takada, Hiroshi; Nakahara, Yasuaki; ; *; Yoshizawa, Nobuaki*
Proc. of NEA/NSC Specialists Meeting on Intermediate Energy Nuclear Data:Models and Codes, 0, p.121 - 136, 1994/00
no abstracts in English
Kaneko, Yoshihiko; Mizumoto, Motoharu; ; Nakahara, Yasuaki; Iwamoto, Akira; Funahashi, Satoru; ; Takeda, Tatsuoki; Hoshi, Michio; Shinohara, Nobuo; et al.
JAERI-M 91-095, 137 Pages, 1991/06
no abstracts in English
; Nakahara, Yasuaki;
JAERI-M 87-088, 50 Pages, 1987/06
no abstracts in English
Aoyama, Yoshio; Miyamoto, Yasuaki; Yamaguchi, Hiromi; Hirata, Yosuke*; Naito, Susumu*; Sano, Akira*; Nakahara, Katsuhiko*; Sato, Mitsuyoshi*; Nambu, Kenichi*; Takahashi, Hiroyuki*; et al.
no journal, ,
no abstracts in English
Okano, Yasuaki*; Nishikino, Masaharu; Nakahara, Shogo*; Tokita, Shigeki*; Masuno, Shinichiro*; Hashida, Masaki*; Sakabe, Shuji*; Nakano, Hidetoshi*; Kawachi, Tetsuya; Nishimura, Hiroaki*; et al.
no journal, ,
The generation of monoenergetic hard X-rays more than 10 keV has attracted much attention for X-ray imaging in the field of high density physics and biomedical applications. Our group is currently developing an X-ray microbeam system to study radiobiological effects of cells as fundamental study of radiation therapy. In such applications, improvement of conversion efficiency (CE) from the driving laser to X-rays is an important issue and some approaches for efficient X-ray generation up to several keV have been proposed so far using low density, surface-structured targets, such as porous metals, velvet targets, and carbon nanotubes (CNTs), with the concepts of improvement of the laser absorption efficiency. In this work, we investigated the yields of K-alpha emission from bare and aligned CNT-array coated metal targets to take baseline data aiming to improve the CE in hard X-ray region (multi-keV to tens of keV) by adapting such kind of method.
