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Iwamoto, Osamu; Iwamoto, Nobuyuki; Kunieda, Satoshi; Minato, Futoshi; Nakayama, Shinsuke; Kimura, Atsushi; Nakamura, Shoji; Endo, Shunsuke; Nagaya, Yasunobu; Tada, Kenichi; et al.
EPJ Web of Conferences, 284, p.14001_1 - 14001_7, 2023/05
Times Cited Count：0 Percentile：0.21(Nuclear Science & Technology)
:Eu
storage phosphors for wide-range neutron detectionSakasai, Kaoru; To, Kentaro; Nakamura, Tatsuya; Ochiai, Kentaro; Konno, Chikara
Proceedings of 2014 IEEE Nuclear Science Symposium and Medical Imaging Conference; 21st International Symposium on Room-Temperature Semiconductor X-ray and 
-ray detectors (NSS/MIC 2014), Vol.3 , p.1834 - 1839, 2016/05
no abstracts in English
Sukegawa, Atsuhiko; Iida, Hiromasa*; Itoga, Toshio*; Okumura, Keisuke; Kai, Tetsuya; Konno, Chikara; Nakashima, Hiroshi; Nakamura, Takashi*; Ban, Shuichi*; Yashima, Hiroshi*; et al.
Hoshasen Shahei Handobukku; Kisohen, p.299 - 356, 2015/03
no abstracts in English
storage phosphors to wide-range neutron detectionSakasai, Kaoru; To, Kentaro; Nakamura, Tatsuya; Takakura, Kosuke; Konno, Chikara; Iwamoto, Yosuke
Proceedings of 2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC), Vol.3, p.2024 - 2030, 2013/00
Storage characteristics of KCl:Eu phosphor were investigated in order to apply the phosphor to wide-range neutron detection. For detection of both slow and fast neutrons, 
LiF powders and polyethylene powders were added to the phosphor at the same time. The optimization of the phosphor for maximum photostimulated luminescence yields have been performed and obtained at a polyethylene weight ratio of about 0.05 when the mixtures were irradiated by fast neutron with energy of 14.8 MeV, where the weight ratio of KCl:Eu phosphor to LiF powders was fixed to be two to three. These experimental results well agreed with theoretical predictions by Monte Carlo simulation using PHITS code. The energy deposition by slow or intermediate neutrons was mainly due to charged particles as a result of nuclear reaction of Li(n,
)T. According to relativistic calculation, the energy of alpha particles or tritons cannot be uniquely determined in a laboratory system but has a certain distribution even if incident neutron energy is fixed when neutron energy is high. The calculation showed that charged particles produced by nuclear reactions such as 
K(n,) or 
Cl(n,), in addition to protons by 
H(n,n) H reaction, will contribute the total energy deposition at high energy of incident neutrons.
Rh
)
Si studied by laser angle-resolved photoemission spectroscopyYoshida, Rikiya*; Nakamura, Yoshiaki*; Fukui, Masaki*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Okawa, Mario*; Shin, S.*; Hirai, Masaaki*; Muraoka, Yuji*; et al.
Journal of Physics; Conference Series, 273, p.012021_1 - 012021_4, 2011/02
Times Cited Count：1 Percentile：33.67(Physics, Condensed Matter)SiYoshida, Rikiya*; Nakamura, Yoshiaki*; Fukui, Masaki*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Okawa, Mario*; Shin, S.*; Hirai, Masaaki*; Muraoka, Yuji*; et al.
Physical Review B, 82(20), p.205108_1 - 205108_6, 2010/11
Times Cited Count：62 Percentile：88.25(Materials Science, Multidisciplinary) phosphors with radiators by irradiation of fast neutronsSakasai, Kaoru; Iwamoto, Yosuke; To, Kentaro; Nakamura, Tatsuya; Takakura, Kosuke; Konno, Chikara
2010 IEEE Nuclear Science Symposium Conference Record (CD-ROM), p.966 - 970, 2010/10
Storage characteristics of KBr:Eu phosphor were investigated when the phosphor was irradiated by fast neutron with energy of 14.8 MeV. To improve the fast neutron sensitivity, polyethylene (PE) sheets as a proton generator were set in front of the phosphors. The maximum photostimulated luminescence (PSL) yields were obtained at a PE thickness of about 3 mm. These experimental results well agreed with those by Monte Carlo simulation using PHITS code. Estimated PSL yields by -ray associated with fast neutron fields were negligible. This combination use of such phosphors and PE sheets will be usable for fast neutron monitoring or imaging.
Al
Haga, Yoshinori; Homma, Yoshiya*; Aoki, Dai*; Ikeda, Shugo*; Matsuda, Tatsuma; Tateiwa, Naoyuki; Yamamoto, Etsuji; Nakamura, Akio; Nakajima, Kenji; Arai, Yasuo; et al.
IOP Conference Series; Materials Science and Engineering, 9, p.012046_1 - 012046_7, 2010/05
Times Cited Count：0 Percentile：1.02(Chemistry, Inorganic & Nuclear)Onuki, Yoshichika; Settai, Rikio*; Honda, Fuminori*; Dung, N. D.*; Ishikura, Tatsuro*; Takeuchi, Tetsuya*; Matsuda, Tatsuma; Tateiwa, Naoyuki; Nakamura, Akio; Yamamoto, Etsuji; et al.
Physica B; Condensed Matter, 405(9), p.2194 - 2199, 2010/05
Times Cited Count：1 Percentile：6.44(Physics, Condensed Matter)Ukai, Mitsuko*; Kameya, Hiromi*; Nakamura, Hideo*; Todoriki, Setsuko*; Kikuchi, Masahiro; Sakashita, Tetsuya; Funayama, Tomoo; Kobayashi, Yasuhiko
JAEA-Review 2009-041, JAEA Takasaki Annual Report 2008, P. 85, 2009/12
By Electron Spin Resonance (ESR) spectroscopy, we revealed free radicals in irradiated garlic. The representative ESR spectrum of garlic is composed of a singlet at the 
-value of 2.0. The signal is due to organic free radicals. Upon -irradiation, new signals appeared. To analyze the irradiation effects, we proposed an ESR detection method of irradiated garlic.
TiO
pebble bed for a test blanket module in JAEATanigawa, Hisashi; Hoshino, Tsuyoshi; Kawamura, Yoshinori; Nakamichi, Masaru; Ochiai, Kentaro; Akiba, Masato; Ando, Masami; Enoeda, Mikio; Ezato, Koichiro; Hayashi, Kimio; et al.
Nuclear Fusion, 49(5), p.055021_1 - 055021_6, 2009/05
Times Cited Count：23 Percentile：64.12(Physics, Fluids & Plasmas)This paper presents recent achievements of the research activities for the TBM being developed in JAEA, focusing on the pebble bed of the tritium breeder materials and tritium behaviour. For the breeder material, the chemical stability of LiTiO has been improved by LiO additives. In order to analyze the pebble bed behaviour, thermo-mechanical properties of the LiTiO pebble bed has been experimentally obtained. In order to verify nuclear properties of the pebble bed, the activation foil method has been proposed and a preliminary experiment has been conducted. For the tritium behaviour, the chemical densified coating method has been well developed and tritium recovery system has been modified taking account of the design change of the TBM.
phosphors with radiators by irradiation of fast neutronsSakasai, Kaoru; Iwamoto, Yosuke; Nakamura, Tatsuya; To, Kentaro; Takakura, Kosuke; Konno, Chikara
Proceedings of 2009 IEEE Nuclear Science Symposium and Medical Imaging Conference (2009 NSS/MIC), Vol.2, p.1422 - 1426, 2009/00
Times Cited Count：1 Percentile：54.00(Engineering, Electrical & Electronic)Storage phosphors such as KCl:Eu with low -ray sensitivity were applied to detection of fast neutrons using polyethylene (PE) sheets as a proton generator that were set in front of the phosphors. The maximum PSL yields were obtained at a PE thickness of 3 mm when the neutron energy was 14.8 MeV. These experimental results well agreed with those by Monte Carlo simulation using PHITS code. Estimated PSL yields by -ray associated with fast neutron fields were negligible. This combination use of such phosphors and PE sheets will be usable for fast neutron monitoring or imaging in a high -ray fields.
AlAoki, Dai*; Haga, Yoshinori; Matsuda, Tatsuma; Tateiwa, Naoyuki; Ikeda, Shugo*; Homma, Yoshiya*; Sakai, Hironori; Shiokawa, Yoshinobu*; Yamamoto, Etsuji; Nakamura, Akio; et al.
Journal of the Physical Society of Japan, 77(Suppl.A), p.159 - 164, 2008/00
Times Cited Count：3 Percentile：27.50(Physics, Multidisciplinary)Superconducting properties are investigated on the new neptunium-based superconductor NpPdAl. The large electronic specific heat, anisotropy of magnetic as well as superconducting properties and strong paramagnetic effect implies spin-singlet pairing with anisotropic superconducting gap.
Al in the vicinity of the heavy fermion formationAoki, Dai*; Homma, Yoshiya*; Shiokawa, Yoshinobu*; Haga, Yoshinori; Matsuda, Tatsuma; Tateiwa, Naoyuki; Ikeda, Shugo; Sakai, Hironori; Yamamoto, Etsuji; Nakamura, Akio; et al.
Kotai Butsuri, 42(9), p.569 - 580, 2007/09
The first neptunium superconductor was discovered in NpPdAl. Unconventional superconductivity of NpPdAl is realized before onset of the heavy fermion state, which is compared with superconducting properties of CeCoIn and PuRhGa (PuCoGa).
AlAoki, Dai*; Haga, Yoshinori; Matsuda, Tatsuma; Tateiwa, Naoyuki; Ikeda, Shugo; Homma, Yoshiya*; Sakai, Hironori; Shiokawa, Yoshinobu*; Yamamoto, Etsuji; Nakamura, Akio; et al.
Journal of the Physical Society of Japan, 76(6), p.063701_1 - 063701_4, 2007/06
Times Cited Count：105 Percentile：93.31(Physics, Multidisciplinary)We succeeded in growing a new transuranium compound NpPdAl with the tetragonal crystal structure by the Pb-flux method, and measured the electrical resistivity, specific heat, magnetic susceptibility and magnetization. NpPdAl is found to be a paramagnetic heavy-fermion superconductor with strong coupling. The upper critical field H
at 0 K is large and highly anisotropic.
Aoki, Dai*; Haga, Yoshinori; Homma, Yoshiya*; Shiokawa, Yoshinobu*; Yamamoto, Etsuji; Nakamura, Akio; Settai, Rikio*; Onuki, Yoshichika
Journal of the Physical Society of Japan, 75(11), p.114715_1 - 114715_7, 2006/11
Times Cited Count：5 Percentile：37.26(Physics, Multidisciplinary)Aoki, Dai*; Homma, Yoshiya*; Sakai, Hironori; Ikeda, Shugo; Shiokawa, Yoshinobu; Yamamoto, Etsuji; Nakamura, Akio; Haga, Yoshinori; Settai, Rikio*; Onuki, Yoshichika
Journal of the Physical Society of Japan, 75(8), p.084710_1 - 084710_10, 2006/08
Times Cited Count：9 Percentile：51.65(Physics, Multidisciplinary)no abstracts in English
Aoki, Dai*; Yamagami, Hiroshi*; Homma, Yoshiya*; Shiokawa, Yoshinobu; Yamamoto, Etsuji; Nakamura, Akio; Haga, Yoshinori; Settai, Rikio*; Onuki, Yoshichika
Physica B; Condensed Matter, 378-380, p.978 - 980, 2006/05
Times Cited Count：0 Percentile：0.00(Physics, Condensed Matter)no abstracts in English
Moriyama, Kiyofumi; Maruyama, Yu; Usami, Tsutomu*; Nakamura, Hideo
JAERI-Research 2005-017, 173 Pages, 2005/08
JAERI-Research-2005-017.pdf:11.17MB
A series of experiments on the break-up of high temperature oxide and steel melt jets in a water pool was conducted. The objective was to obtain data for the jet break-up length and size distribution of the droplets produced by the jet break-up, and information on the influence of material properties. Also, we tried to obtain additional information giving a clue to the mechanism governing the melt jet break-up, such as flow intensity of the steam column surrounding the melt jet, and its relation with the droplet size. In the experiments, zirconia-alumina mixture and stainless steel melt jets with diameter 
17mm and velocity 7.8m/s at the water surface were dropped into a deep (2.1m) or shallow (0.6m) water pool with various subcool. From the results of the present experiments and also by referring other experimental data from literature, we obtained empirical correlation equations for the jet break-up length, the fraction of jet broken-up in a shallow pool where the jet was not completely broken-up, and the droplet size.
electrons and the Fermi surface properties in an enhanced Pauli paramagnet NpGe
Aoki, Dai*; Yamagami, Hiroshi*; Homma, Yoshiya*; Shiokawa, Yoshinobu; Yamamoto, Etsuji; Nakamura, Akio; Haga, Yoshinori; Settai, Rikio*; Onuki, Yoshichika
Journal of the Physical Society of Japan, 74(8), p.2149 - 2152, 2005/08
Times Cited Count：25 Percentile：72.84(Physics, Multidisciplinary)no abstracts in English
