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Journal Articles

Activity report of the Task Group on Parameters Used in Biospheric Dose Assessment Models for Radioactive Waste Disposal

Takahashi, Tomoyuki*; Fukaya, Yukiko*; Iimoto, Takeshi*; Uni, Yasuo*; Kato, Tomoko; Sun, S.*; Takeda, Seiji; Nakai, Kunihiro*; Nakabayashi, Ryo*; Uchida, Shigeo*; et al.

Hoken Butsuri (Internet), 56(4), p.288 - 305, 2021/12

We report the results of activities related to the Task Group of Parameters Used in Biospheric Dose Assessment Models for Radioactive Waste Disposal at the Japan Health Physics Society.

Journal Articles

Thickness and density of additive adsorbed layer on metal surface measured by neutron reflectometry and its effect on tribological properties

Hirayama, Tomoko*; Torii, Takashi*; Konishi, Yohei*; Maeda, Masayuki*; Matsuoka, Takashi*; Inoue, Kazuko*; Hino, Masahiro*; Yamazaki, Dai; Takeda, Masayasu

Nihon Kikai Gakkai Rombunshu, C, 77(779), p.2884 - 2893, 2011/07

Journal Articles

A New measurement of the astrophysical $$^8$$Li($$alpha$$, n)$$^{11}$$B reaction

Ishiyama, Hironobu*; Hashimoto, Takashi; Ishikawa, Tomoko*; Watanabe, Yutaka*; Das, S. K.*; Miyatake, Hiroari; Mizoi, Yutaka*; Fukuda, Tomokazu*; Tanaka, Masahiko*; Fuchi, Yoshihide*; et al.

Physics Letters B, 640(3), p.82 - 85, 2006/09

 Times Cited Count:31 Percentile:85.47(Astronomy & Astrophysics)

The excitation function of the $$^{8}$$Li($$alpha$$,n)$$^{11}$$B reaction was measured while identifying the final state event by event in the region of E$$_{rm{cm}}$$ = 0.7 - 2.6 MeV using a highly efficient detector system and a low-energy $$^8$$Li beam. The results are much improved both in statistics and precisions, and show smaller cross sections than those of previous measurements by a factor of more than 2 in the low-energy region of E$$_{rm{cm}}le$$ 1.5 MeV. A resonance-like structure is found at around E$$_{rm{cm}}$$ = 0.85 MeV.

Journal Articles

A New measurement of the $$^8$$Li($$alpha$$,n)$$^{11}$$B reaction for astrophysical interest

Das, S. K.*; Fukuda, Tomokazu*; Mizoi, Yutaka*; Ishiyama, Hironobu*; Miyatake, Hiroari*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Tanaka, Masahiko*; Yoshikawa, Nobuharu*; Jeong, S.-C.*; et al.

AIP Conference Proceedings 847, p.374 - 376, 2006/07

no abstracts in English

Journal Articles

Production of a low-energy radioactive nuclear beam with high purity using JAERI-RMS

Ishiyama, Hironobu*; Ishikawa, Tomoko*; Hashimoto, Takashi; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Miyatake, Hiroari; Tanaka, Masahiko*; Fuchi, Yoshihide*; Yoshikawa, Nobuharu*; et al.

Nuclear Instruments and Methods in Physics Research A, 560(2), p.366 - 372, 2006/05

 Times Cited Count:7 Percentile:48.74(Instruments & Instrumentation)

Thanks to the nature of inverse transfer-reactions, low-energy radioactive nuclear beams in light neutron-rich region were produced. The mass-separation and velocity-separation of the JAERI recoil mass-separator help to form high purity beams. The beams of $$^8$$Li, $$^{12}$$B, and $$^{16}$$N-RNBs are utilized to the experiments, so far, with those beam intensities and purities of 1.4$$times$$10$$^4$$ pps and 99$$%$$, 7.8$$times$$10$$^3$$ pps and 98$$%$$, and 4.7$$times$$10$$^3$$ pps and 98.5$$%$$, respectively.

Journal Articles

Measurement of self-diffusion coefficients in Li ionic conductors by using the short-lived radiotracer of $$^8$$Li

Jeong, S.-C.*; Katayama, Ichiro*; Kawakami, Hirokane*; Watanabe, Yutaka*; Ishiyama, Hironobu*; Imai, Nobuaki*; Hirayama, Yoshikazu*; Miyatake, Hiroari; Sataka, Masao; Okayasu, Satoru; et al.

Journal of Phase Equilibria and Diffusion, 26(5), p.472 - 476, 2005/09

Authors developed a radiotracer method for diffusion studies in solids. The experimental test was performed by the measurement of the diffusion coefficients of Li in a sample of the compound $$beta$$LiAl using an $$alpha$$-emitting radiotracer of $$^8$$Li(T$$_{1/2}$$ = 0.84 s). It was found that the time-dependent yields of the alpha particles from the diffusing 8Li that was initially implanted in the sample could be used as a measure of the diffusivity of the tracer in a nondestructive way. The method was applied to measure the self-diffusion coefficients of Li in $$beta$$LiGa, and for investigating how the Li diffusion in the Li ionic conductors is affected by the concentration of atomic defects.

Oral presentation

Study of astrophysical ($$alpha$$,n) reactions on light neutron-rich nuclei using low-energy radioactive nuclear beams

Hashimoto, Takashi; Mitsuoka, Shinichi; Ichikawa, Shinichi; Ikezoe, Hiroshi; Miyatake, Hiroari; Ishiyama, Hironobu*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Tanaka, Masahiko*; et al.

no journal, , 

no abstracts in English

Oral presentation

Direct measurements of astrophysical nuclear reaction rates on light neutron-rich nuclei at TRIAC and JAEA-RMS

Miyatake, Hiroari; Ishiyama, Hironobu*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Tanaka, Masahiko*; Yoshikawa, Nobuharu*; Jeong, S.-C.*; Fuchi, Yoshihide*; Nomura, Toru*; et al.

no journal, , 

no abstracts in English

Oral presentation

Phase transition of base machine oil under high pressure, 1; In the case of dicyclohexyl

Nemoto, Kazuaki*; Hirayama, Tomoko*; Matsuoka, Takashi*; Hattori, Takanori

no journal, , 

no abstracts in English

Oral presentation

Structural analyses of viscosity index improvers in lubricant by means of small-angle X-ray scattering and dynamic light scattering

Takahashi, Ryohei*; Hirayama, Tomoko*; Tamura, Kazushi*; Sato, Nobuhiro*; Sugiyama, Masaaki*; Oba, Yojiro

no journal, , 

Viscosity index improvers (VII) are important additives for lubricants to suppress the temperature dependence of viscosity index. Although the temperature dependence of viscosity index of VII was thought to be related with the temperature dependence of nanostructures, only a few experimental results have been reported so far. Therefore, we performed small-angle X-ray scattering (SAXS) and dynamic light scattering (DLS) to characterize the nanostructures of VII in the lubricant. The results show the change in molecular size with increasing temperature. The relation between the viscosity index and the nanostructures are discussed.

Oral presentation

Follow-up survey of environmental transfer parameter values for biosphere assessment

Fukaya, Yukiko*; Sun, S.*; Hirayama, Makoto*; Sugiyama, Takeshi*; Tagami, Keiko*; Kato, Tomoko; Uchida, Shigeo*

no journal, , 

no abstracts in English

Oral presentation

Investigation of lubrication interface by X-ray and neutron reflectometry

Hino, Masahiro*; Adachi, Nozomu*; Todaka, Yoshikazu*; Oba, Yojiro; Oda, Tatsuro*; Mori, Kazuhiro*; Endo, Hitoshi*; Hirayama, Tomoko*

no journal, , 

no abstracts in English

Oral presentation

Structural analyses of viscosity index improvers in lubricant oil by small angle X-ray scattering

Takahashi, Ryohei*; Hirayama, Tomoko*; Sato, Nobuhiro*; Sugiyama, Masaaki*; Takashima, Yoriyuki*; Nakano, Taeko*; Tamura, Kazushi*; Oba, Yojiro

no journal, , 

no abstracts in English

13 (Records 1-13 displayed on this page)
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