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Nguyen, T. H. T.; Sanami, Toshiya*; Yamazaki, Hirohito*; Iwamoto, Nobuyuki; Itoga, Toshiro*; Kirihara, Yoichi; Lee, E.*; Sugihara, Kenta*; Miyamoto, Shuji*; Hashimoto, Satoshi*; et al.
Physics Letters B, 870, p.139900_1 - 139900_8, 2025/11
Kirihara, Yoichi; Nakashima, Hiroshi; Sanami, Toshiya*; Namito, Yoshihito*; Itoga, Toshiro*; Miyamoto, Shuji*; Takemoto, Akinori*; Yamaguchi, Masashi*; Asano, Yoshihiro*
Journal of Nuclear Science and Technology, 57(4), p.444 - 456, 2020/04
Times Cited Count：10 Percentile：64.83(Nuclear Science & Technology)no abstracts in English
Iwamoto, Yosuke; Satoh, Daiki; Hagiwara, Masayuki*; Iwase, Hiroshi*; Kirihara, Yoichi*; Yashima, Hiroshi*; Nakane, Yoshihiro; Nakashima, Hiroshi; Nakamura, Takashi*; Tamii, Atsushi*; et al.
Nuclear Technology, 168(2), p.340 - 344, 2009/11
Times Cited Count：6 Percentile：39.50(Nuclear Science & Technology)It is important to calculate neutron production from thick targets at forward angle near 0 degree and backward angle near 180 degree for the shielding design of proton accelerator facilities, and the accuracy should be determined by experimental data. There are, however, few experimental data near 0 degree, and no data near 180 degree in the energy region above 100 MeV. Neutron energy spectra at 0, 90 and 180 degrees produced from thick graphite and iron targets by 140 MeV protons were measured. It was found that the calculation with JENDL-HE was more suitable for the shielding design of proton accelerator facilities in the forward direction.
bombarded with 140, 250 and 350 MeV protonsIwamoto, Yosuke; Taniguchi, Shingo*; Nakao, Noriaki*; Itoga, Toshio*; Yashima, Hiroshi*; Nakamura, Takashi*; Satoh, Daiki; Nakane, Yoshihiro; Nakashima, Hiroshi; Kirihara, Yoichi*; et al.
Nuclear Instruments and Methods in Physics Research A, 593(3), p.298 - 306, 2008/08
Times Cited Count：12 Percentile：59.78(Instruments & Instrumentation)Neutron energy spectra at 0 produced from stopping-length graphite, aluminum, iron and lead targets bombarded with 140, 250 and 350 MeV protons were measured at the neutron TOF course in RCNP of Osaka University. The neutron energy spectra were obtained by using the time-of-flight technique in the energy range from 10 MeV to incident proton energy. To compare the experimental results, Monte Carlo calculations with the PHITS and MCNPX codes were performed using the JENDL-HE and the LA150 evaluated nuclear data files, the ISOBAR model implemented in PHITS, and the LAHET code in MCNPX. It was found that these calculated results at 0 generally agreed with the experimental results in the energy range above 20 MeV except for graphite at 250 and 350 MeV.
Yomogida, Takumi; Kobata, Masaaki; Watanabe, Yusuke; Fujimori, Shinichi; Kirihara, Yoichi; Yaita, Tsuyoshi; Okamoto, Yoshihiro; Doi, Reisuke; Kobayashi, Toru; Tsuji, Takuya; et al.
no journal, ,
We detected particles containing Uranium(U) in stagnant water of Fukushima Daiichi Nuclear Power Station building and analyzed by synchrotron microbeam X-ray spectroscopy. We found two different types of U-containing particles: fine U particles (a few micrometers in diameter) and Fe particles with adsorbed U (tens to hundreds of micrometers in diameter). The X-ray absorption fine structure (XAFS) spectra of these particles showed that the U distributed on the Fe particles was in a more oxidized states than the fine U particles, which suggested these U had migrated to the stagnant water through a different formation process.
Kobata, Masaaki; Kobayashi, Toru; Tanida, Hajime; Okamoto, Yoshihiro; Fukuda, Tatsuo; Tsuji, Takuya; Matsuda, Shohei; Kawasaki, Ikuto; Shibata, Goro; Doi, Reisuke; et al.
no journal, ,
no abstracts in English
Kirihara, Kazuhiro*; Kawaguchi, Kenji*; Shimizu, Yoshiki*; Sasaki, Takeshi*; Koshizaki, Naoto*; Kimura, Kaoru*; Yamada, Yoichi; Yamamoto, Hiroyuki; Shamoto, Shinichi
no journal, ,
Radiation effects of the boron nano-belt on the electronic conductivity have been studied.
Kirihara, Yoichi; Namito, Yoshihito*; Sanami, Toshiya*; Itoga, Toshiro*; Nakashima, Hiroshi; Miyamoto, Shuji*; Asano, Yoshihiro*
no journal, ,
no abstracts in English
Kobayashi, Toru; Kobata, Masaaki; Tanida, Hajime; Fujimori, Shinichi; Tsuji, Takuya; Fukuda, Tatsuo; Shibata, Goro; Kawasaki, Ikuto; Matsuda, Shohei; Doi, Reisuke; et al.
no journal, ,
no abstracts in English
Kirihara, Kazuhiro*; Kawaguchi, Kenji*; Shimizu, Yoshiki*; Sasaki, Takeshi*; Koshizaki, Naoto*; Kimura, Kaoru*; Yamada, Yoichi; Yamamoto, Hiroyuki; Shamoto, Shinichi
no journal, ,
We discuss the effects of neutron and 
-ray irradiation on electrical transport of single-crystalline boron nanobelts toward a nano-scale radiation sensor device. Changes of electrical conductance of individual nanobelt before and after thermal neutron irradiation with low (10
cm
s
) or high (3
10
cm s) flux are presented.
Kobayashi, Toru; Kobata, Masaaki; Tanida, Hajime; Okamoto, Yoshihiro; Fukuda, Tatsuo; Tsuji, Takuya; Matsuda, Shohei; Kawasaki, Ikuto; Shibata, Goro; Doi, Reisuke; et al.
no journal, ,
no abstracts in English
Kirihara, Kazuhiro*; Kawaguchi, Kenji*; Shimizu, Yoshiki*; Sasaki, Takeshi*; Koshizaki, Naoto*; Kimura, Kaoru*; Yamada, Yoichi; Yamamoto, Hiroyuki; Shamoto, Shinichi
no journal, ,
Isotopic 
B atom has large thermal neutron capture cross section. 
Li atom and 
particle as a product of the neutron reaction can change the electrical transport property of the boron-rich semiconductor because they provide carrier doping and lattice defects. We successfully synthesized catalyst-free single-crystalline boron nanobelts (BNBs) and clarified the electrical transport and photoconduction mechanism of individual nanobelt. The BNB device is promising candidates for solid-state neutron sensors with both high resolution and good discrimination performance between neutron and -ray. In the presentation, we discuss the performance of thermal neutron detection of BNB devices. Isotopic B enriched BNBs was synthesized to detect thermal neutrons efficiently. Electrical conductance of a nanobelt increased to eight times after the thermal neutron irradiation with a dose of 1.810
cm by the neutron reaction of B.
Au(,xn) reactionTran, T. K.*; Sanami, Toshiya*; Yamazaki, Hirohito*; Itoga, Toshiro*; Sakaki, Yasuhito*; Nguyen, L. T. T.*; Kirihara, Yoichi; Nakashima, Hiroshi*; Miyamoto, Shuji*; Asano, Yoshihiro*
no journal, ,
no abstracts in English
Masuyama, Koichi; Ishii, Daiki; Taki, Kosei; Kirihara, Yoichi; Nidaira, Atsushi; Tachibana, Haruo; Kawasaki, Katsuya
no journal, ,
no abstracts in English
