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Journal Articles

Impact of the temperature on the non-destructive nuclide assay in the transmission NRF method

Omer, M.; Shizuma, Toshiyuki*; Koizumi, Mitsuo; Taira, Yoshitaka*; Zen, H.*; Ogaki, Hideaki*; Hajima, Ryoichi

UVSOR-50, P. 37, 2023/08

no abstracts in English

Journal Articles

A Facility for measurements of (n,$$gamma$$) cross-sections of a nucleus in the range 0.008 $$leq$$ $$E_{rm n}$$ $$<$$ 20 MeV

Segawa, Mariko; Toh, Yosuke; Harada, Hideo; Kitatani, Fumito; Koizumi, Mitsuo; Hatsukawa, Yuichi; Fukahori, Tokio; Matsue, Hideaki; Oshima, Masumi; Tanimura, Yoshihiko; et al.

Nuclear Instruments and Methods in Physics Research A, 618(1-3), p.153 - 159, 2010/06

 Times Cited Count:2 Percentile:22.19(Instruments & Instrumentation)

A new measurement system to determine the neutron-capture cross section of a nucleus at 0.008 $$leq$$ $$E_{rm n}$$ $$<$$ 20 MeV has been installed at the 4 MV Pelletron accelerator laboratory at the facility of radiation standards at Japan Atomic Energy Agency. Pulsed neutrons are produced by bombarding a pulsed proton beam on $$^{7}$$Li (or $$^{2}$$H) or a deuteron beam on $$^{3}$$H. The performance of the new system was studied by measuring discrete $$gamma$$ rays from neutron capture by $$^{206}$$Pb and $$^{207}$$Pb to their low-lying states at several resonances at 10 $$leq$$ $$E_{rm n}$$ $$leq$$ 110 keV using neutrons from $$^{7}$$Li(p,n)$$^{7}$$Be. The $$gamma$$ rays were detected with a good signal-to-noise ratio by means of a highly sensitive anti-Compton NaI(Tl) spectrometer combined with a time-of-flight method. The present study demonstrated good sensitivity of the new system to determine the neutron-capture cross section of a nucleus at keV neutron energy.

Journal Articles

Powder neutron diffraction of La-apatite under low temperature

Matsushita, Yoshitaka*; Izumi, Fujio*; Kobayashi, Kiyoshi*; Igawa, Naoki; Kitazawa, Hideaki*; Oyama, Yukiko*; Miyoshi, Shogo*; Yamaguchi, Shu*

Nuclear Instruments and Methods in Physics Research A, 600(1), p.319 - 321, 2009/02

 Times Cited Count:22 Percentile:80.6(Instruments & Instrumentation)

The neutron powder diffraction data of the apatite-type La-silicate La$$_{9.5}$$Si$$_{6}$$O$$_{26.25}$$ was measured at 10 K and the Rietveld refinement on the basis of hexagonal P6$$_{3}$$/m was successfully carried out. The obtained cell parameters were ${it a}$ =0.971297(7) nm, and ${it c}$ = 0.717950(6) nm. On the Rietveld refinement supported by maximum entropy method, the interstitial oxygen positions show randomly distribution around La2 site, and they may give the driving-force of high ionic conductivity to the main ionic conduction site O4.

Journal Articles

Control of self-assembling processes of polyamidoamine dendrimers and Pd nanoparticles

Tanaka, Hirokazu*; Hashimoto, Takeji; Koizumi, Satoshi; Ito, Hideaki*; Naka, Kensuke*; Chujo, Yoshiki*

Macromolecules, 41(5), p.1815 - 1824, 2008/03

 Times Cited Count:8 Percentile:26.92(Polymer Science)

We have investigated the self-assembly formed by palladium acetate (Pd(OAc)$$_{2}$$) and polyamidoamine dendrimers (GN-NH$$_{2}$$) in a mixed solvent of methanol and N, N-dimethylformamide. We aim to explore effects of the generation number (GN) and concentration of the dendrimers, [GN-NH$$_{2}$$], on the self-assembly of the dendrimers (defined hereafter as "templates") and the Pd nanoparticles inside the templates in order to clarify physical factors controlling the self-assembling mechanisms. We found that the templates are formed only when [GN-NH$$_{2}$$] falls below a critical value and thereby a sufficient amount of Pd(OAc)$$_{2}$$ exists as the binders between the dendrimers. Otherwise dendrimers are molecularly dispersed in solution.

Journal Articles

Combined in situ and time-resolved SANS and SAXS studies of chemical reactions at specific sites and self-assembling processes of reaction products; Reduction of palladium ions in self-assembled polyamidoamine dendrimers as a template

Tanaka, Hirokazu*; Koizumi, Satoshi; Hashimoto, Takeji; Ito, Hideaki*; Sato, Masahide*; Naka, Kensuke*; Chujo, Yoshiki*

Macromolecules, 40(12), p.4327 - 4337, 2007/06

 Times Cited Count:31 Percentile:67.13(Polymer Science)

We reported the reduction process of palladium(II) acetate, Pd(OAc)$$_{2}$$, and self-assembling process of the resulting palladium atoms, Pd(0)'s, into nanoparticles in the presence of the first-generation polyamidoamine dendrimer (G1-NH$$_{2}$$) in non-aqueous solution. The process was induced by mixing the following two solutions: (A) Pd(OAc)$$_{2}$$ dissolved in N,N-dimethylformamide (DMF) and (B) the G1-NH$$_{2}$$ dissolved in methanol, under a specific condition of $$r$$ $$equiv$$ [Pd(OAc)$$_{2}$$]/[-NH$$_{2}$$] = 3.3 where [-NH$$_{2}$$] is mole concentration of the amine groups in the dendrimer in the reaction solution. The reaction and reaction-induced self-assembling process were explored in-situ by means of a combined time-resolved method of small-angle neutron scattering and small-angle X-ray scattering. The method revealed time-evolution of a series of self-assembling processes occurring in the system.

Journal Articles

Introduction to plasma fusion energy

Takamura, Shuichi*; Kado, Shinichiro*; Fujii, Takashi*; Fujiyama, Hiroshi*; Takabe, Hideaki*; Adachi, Kazuo*; Morimiya, Osamu*; Fujimori, Naoji*; Watanabe, Takayuki*; Hayashi, Yasuaki*; et al.

Kara Zukai, Purazuma Enerugi No Subete, P. 164, 2007/03

no abstracts in English

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:32 Percentile:85.01(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

Oral presentation

Measurement of iridium using neutron activation analysis with $$gamma$$-$$gamma$$ coincidence

Hatsukawa, Yuichi; Osawa, Takahito; Matsue, Hideaki; Segawa, Mariko; Oshima, Masumi; Toh, Yosuke; Kimura, Atsushi; Koizumi, Mitsuo; Furutaka, Kazuyoshi

no journal, , 

The multiple $$gamma$$-ray detection method developed for nuclide quantification has achieved better resolution and sensitivity than the ordinary singles $$gamma$$-ray detection method. The INAA combined with this method is called NAAMG (Neutron Activation Analysis with Multiple $$gamma$$ ray detection) and has been successfully applied to various fields. In the case of neutron activation analysis, measurements of $$gamma$$-rays from trace elements are strongly interfered by the $$gamma$$-rays from isotopes produced from major elements, e.g., Na-24, Mn-56. Therefore chemical separation processes are sometimes required to eliminate the major elements for determination of the trace elements. Measurements of iridium in geological sample were carried out by this method. Samples were irradiated at the JRR-3. Iridium concentrations in several standard rock samples and geological samples were also measured by this method. Fifty to one hundred mg of each sample were sealed in quartz tube and irradiated together with iridium standard. After irradiation, the $$gamma$$-$$gamma$$ coincidence of multiple $$gamma$$ rays from the Ir-192 was measured with the Ge detectors array, GEMINI-II. $$gamma$$ rays from about 10 ppt of iridium in geological samples can be detected by this method.

Oral presentation

Neutron capture cross section for Pb isotopes and nucleosynthesis in ultra poor metal star

Segawa, Mariko; Toh, Yosuke; Harada, Hideo; Koizumi, Mitsuo; Hatsukawa, Yuichi; Fukahori, Tokio; Matsue, Hideaki; Oshima, Masumi; Nagai, Yasuki*

no journal, , 

no abstracts in English

Oral presentation

Crystal rotation measurement after high temperature creep in a single-crystal nickel-base superalloy

Shiota, Yoshinori; Akita, Koichi; Suzuki, Hiroyuki*; Kitazawa, Hideaki*; Yokokawa, Tadaharu*; Koizumi, Yutaka*; Harada, Hiroshi*

no journal, , 

no abstracts in English

Oral presentation

SANS and EXAFS investigation of alkyl chain length and branching effects of N,N-dialkylamides on aggregation property

Suzuki, Shinichi; Yaita, Tsuyoshi; Motokawa, Ryuhei; Koizumi, Satoshi; Okamoto, Yoshihiro; Shiwaku, Hideaki

no journal, , 

no abstracts in English

Oral presentation

Development of an in-vessel inspection technology using remote imaging and spectroscopy, 2-2; Radiation resistance of optical fibers

Ito, Chikara; Naito, Hiroyuki; Ito, Hideaki; Imaizumi, Kazuyuki; Nagai, Akinori; Ito, Keisuke; Nishimura, Akihiko; Oba, Hironori; Wakaida, Ikuo; Sugiyama, Akira; et al.

no journal, , 

no abstracts in English

Oral presentation

Radiation resistance evaluation of optical fibers for an in-vessel inspection technology using remote imaging and spectroscopy

Naito, Hiroyuki; Ito, Chikara; Ito, Hideaki; Imaizumi, Kazuyuki; Ito, Keisuke

no journal, , 

no abstracts in English

Oral presentation

Giant magnetocaloric effect and short-range ordering of magnetic refrigerant materials R$$_5$$Pd$$_2$$(R=Tb, Ho)

Kitazawa, Hideaki*; Kawamura, Yukihiko*; Keller, L.*; Toyoizumi, Saori*; Terada, Noriki*; Suzuki, Hiroyuki*; Mamiya, Hiroaki*; Doenni, A.*; Lee, S.*; Metoki, Naoto; et al.

no journal, , 

Neutron Scattering study has been carried out in order to reveal the magnetic structure of the antiferromagnet Ho$$_5$$Pd$$_2$$, which shows giant magnetocaloric effect. We observed short rage magnetic order at k=0.18, 0.18, 0.18 above the antiferromagnetic transition temperature $$T$$$$_N$$. Tb$$_5$$Pd$$_2$$ also showed magnetic short range correlation above the temperature higher than 2$$times$$$$T$$$$_N$$.

Oral presentation

Development of an in-vessel inspection technology using remote imaging and spectroscopy, 3-3; Transmission characteristics of a silica core fiber under high radiation

Naito, Hiroyuki; Ito, Chikara; Ito, Keisuke; Imaizumi, Kazuyuki; Ito, Hideaki; Nagai, Akinori

no journal, , 

no abstracts in English

16 (Records 1-16 displayed on this page)
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