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Iwamoto, Osamu; Iwamoto, Nobuyuki; Kunieda, Satoshi; Minato, Futoshi; Nakayama, Shinsuke; Abe, Yutaka*; Tsubakihara, Kosuke*; Okumura, Shin*; Ishizuka, Chikako*; Yoshida, Tadashi*; et al.
Journal of Nuclear Science and Technology, 60(1), p.1 - 60, 2023/01
Times Cited Count：64 Percentile：99.99(Nuclear Science & Technology)Ichihara, Akira; Abe, Yutaka*
JAEA-Conf 2022-001, p.175 - 180, 2022/11
Thermal neutron scattering law data were calculated for the heavy water molecule toward the fifth version of the Japanese evaluated nuclear data library, JENDL-5. The scattering laws for deuterium and oxygen atoms were computed using the molecular dynamics simulations. The simulations have been performed in the temperature range from 283.6 K to 600 K. The scattering law data have been evaluated in the neutron incident energies between 0.01 meV and 10 eV. With the obtained scattering laws, we calculated the cross sections for the heavy water molecule, and confirmed that the experimental data at room temperature were well reproduced. Moreover, in the computed temperature range, the cross sections were almost consistent with the ENDF/B-VIII.0 evaluations.
Okita, Shoichiro; Tasaki, Seiji*; Abe, Yutaka*
Nihon Genshiryoku Gakkai Wabun Rombunshi, 19(3), p.178 - 184, 2020/09
The Kyoto University Accelerator-based Neutron Source (KUANS) is a compact neutron source that is mainly used for spectrometer and detector development. In addition, it is also suited for experiments to study the neutronic design of moderators owing to the relatively low neutron generation yield by 
Be(p,n). We present a neutronic design of the neutron moderator on a reentrant-hole configuration for KUANS to enhance the neutron emission, and some experiments are conducted at KUANS for verification. A polyethylene moderator on a reentrant-hole configuration is designed by PHITS calculation and is introduced to KUANS to obtain intense oblong neutron beams. The intensity of the pulsed neutron beam is experimentally measured. The results reveal that the intensity becomes approximately 1.9 times stronger than that of the conventional rectangular design. In addition, the ratio of its intensity to the conventional intensity increases to approximately threefold as the neutron wavelength increases. It is interesting to note that the longer the neutron wavelength, the more efficiently they are extracted from the inside of the moderator owing to the existence of the reentrant-hole configuration.
Sasajima, Hideo; Fuketa, Toyoshi; Nakamura, Takehiko; Nakamura, Jinichi; Uetsuka, Hiroshi; Kikuchi, Keiichi*; Abe, Tomoyuki*
JAERI-Research 99-060, p.62 - 0, 2000/03
JAERI-Research-99-060.pdf:12.05MB
no abstracts in English
Fuketa, Toyoshi; Nakamura, Takehiko; Sasajima, Hideo; Nagase, Fumihisa; Uetsuka, Hiroshi; Kikuchi, Keiichi*; Abe, Tomoyuki*
Proceedings of an International Topical Meeting on Light Water Reactor Fuel Performance (CD-ROM), 15 Pages, 2000/00
no abstracts in English
Sasajima, Hideo; Fuketa, Toyoshi; Ishijima, Kiyomi; Kikuchi, Keiichi*; Abe, Tomoyuki*
Proceedings of 7th International Conference on Nuclear Engineering (ICONE-7) (CD-ROM), 10 Pages, 1999/00
no abstracts in English
Harada, Masahide; Abe, Yutaka*; Teshigawara, Makoto; Oi, Motoki; Ikeda, Yujiro; Oikawa, Kenichi; Nakajima, Kenji; Kawamura, Seiko
no journal, ,
By using neutron instruments, NOBORU and AMATERAS, in J-PARC spallation neutron source, we started to measure temperature dependent total and scattering cross section data of hydrogenous material ranging in thermal and cold neutron region. The cross section data of light water and ethanol were measured.
Ichihara, Akira; Abe, Yutaka*
no journal, ,
Light and heavy water are being used as moderators in fission reactors. Reliable data of thermal neutron scattering in these materials is essential to the analysis of reactor cores. In this study we tried to evaluate angular distribution and energy spectrum of emitted neutrons employing the information obtained from molecular dynamics simulations. The simulations have been performed for light and heavy water. The thermal neutron scattering has been evaluated by using the fluctuation-dissipation theorem of statistical mechanics, where the trajectory data for hydrogen, deuterium and oxygen atoms were utilized. In calculation, incoherent scattering was assumed to be dominant in light water, while both the coherent and incoherent scattering contributions were considered in heavy water.
Harada, Masahide; Abe, Yutaka*; Oikawa, Kenichi; Kawasaki, Takuro; Kawamura, Seiko; Nakajima, Kenji; Inamura, Yasuhiro; Takahashi, Ryuta*; Teshigawara, Makoto; Oi, Motoki; et al.
no journal, ,
no abstracts in English
Abe, Yutaka*; Ichihara, Akira
no journal, ,
In the JENDL-5 thermal neutron scattering law sublibrary, the thermal neutron scattering data have been stored for 37 materials. In Kyoto University and JAEA, we evaluated the scattering law data for light water, heavy water, methane, ethanol, benzene, toluene, m-xylene, mesitylene, and triphenylmethane. We will show the evaluation methods of the thermal neutron scattering and compare the evaluated data with experimental data.
300 K; Methanol, benzene and tolueneHarada, Masahide; Abe, Yutaka*; Teshigawara, Makoto; Oi, Motoki; Ikeda, Yujiro*; Oikawa, Kenichi; Kawamura, Seiko; Inamura, Yasuhiro
no journal, ,
no abstracts in English
Harada, Masahide; Abe, Yutaka*; Oikawa, Kenichi; Kawamura, Seiko; Inamura, Yasuhiro; Teshigawara, Makoto; Oi, Motoki; Ikeda, Yujiro*
no journal, ,
no abstracts in English
300 K; o-xylene, m-xylene and p-xyleneHarada, Masahide; Abe, Yutaka*; Teshigawara, Makoto; Oi, Motoki; Ikeda, Yujiro*; Oikawa, Kenichi; Kawamura, Seiko; Inamura, Yasuhiro
no journal, ,
Hydrogenous materials are mainly applied as a moderator material used in high-intense and small neutron sources because of good moderating characterization for neutrons. Scattering data including total cross sections of cold-thermal neutrons are important to characterize moderators. However, as some measurements are old, we have been continuously and systematically measuring the cross sections of hydrogenous materials since 2018 for a new neutron source development. In this presentation, the measurements of o-xylene, m-xylene and p-xylene carried out in 2020 and 2021 will be presented as a hydrogenous material. The measurements were performed at NOBORU and AMATERAS in MLF of J-PARC. The total cross sections were measured at NOBORU, and the scattering cross sections were measured at AMATERAS. The sample temperatures were 20, 100, 200, 300 K and temperatures near the melting point. The sample was contained in an aluminum cell. The time-of-flight method was used to measure the energy-dependent transmission of the sample. The scattering data was converted to the scattering cross section by a multiple energy chopping. Details will be reported on the day.
Harada, Masahide; Abe, Yutaka*; Oikawa, Kenichi; Kawamura, Seiko; Inamura, Yasuhiro; Teshigawara, Makoto; Oi, Motoki; Ikeda, Yujiro*
no journal, ,
no abstracts in English
Harada, Masahide; Abe, Yutaka*; Oikawa, Kenichi; Tsuchikawa, Yusuke; Kawamura, Seiko; Inamura, Yasuhiro; Teshigawara, Makoto; Oi, Motoki; Yamaguchi, Yuji; Ikeda, Yujiro*
no journal, ,
no abstracts in English
