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Journal Articles

Measurements of thermal-neutron capture cross-section and resonance integral of neptunium-237

Nakamura, Shoji; Kitatani, Fumito; Kimura, Atsushi; Uehara, Akihiro*; Fujii, Toshiyuki*

Journal of Nuclear Science and Technology, 56(6), p.493 - 502, 2019/06

 Times Cited Count:2 Percentile:34.3(Nuclear Science & Technology)

The thermal-neutron capture cross-section($$sigma_{0}$$)and resonance integral(I$$_{0}$$) were measured for the $$^{237}$$Np(n,$$gamma$$)$$^{238}$$Np reaction by an activation method. A method with a Gadolinium filter, which is similar to the Cadmium difference method, was used to measure the $$sigma_{0}$$ with paying attention to the first resonance at 0.489 eV of $$^{237}$$Np, and a value of 0.133 eV was taken as a cut-off energy. Neptunium-237 samples were irradiated at the pneumatic tube of the Kyoto University Research Reactor in Institute for Integral Radiation and Nuclear Science, Kyoto University. Wires of Co/Al and Au/Al alloys were used as monitors to determine thermal-neutron fluxes and epi-thermal Westcott's indices at an irradiation position. A $$gamma$$-ray spectroscopy was used to measure activities of $$^{237}$$Np, $$^{238}$$Np and neutron monitors. On the basis of Westcott's convention, the $$sigma_{0}$$ and I$$_{0}$$ values were derived as 186.9$$pm$$6.2 barn, and 1009$$pm$$90 barn, respectively.

Journal Articles

In-situ photoemission spectroscopy for chemical reaction dynamics study of Si(001) oxidation by using high-energy-resolution synchrotron radiation

Teraoka, Yuden; Yoshigoe, Akitaka

Oyo Butsuri, 71(2), p.1523 - 1527, 2002/12

The translational kinetic energy of incident molecules is an important parameter for the study of surface chemical reaction mechanisms. New adsorption reactions, induced by the O$$_{2}$$ translational kinetic energy of several eV, have been found in the O$$_{2}$$/Si(001) system by applying the surface photoemission spectroscopy with supersonic molecular beam techniques and the high-energy-resolution synchrotron radiation. The termination of dangling bonds affected dominantly the oxidation of dimer backbonds. By controlling the translational kinetic energy of incident O$$_{2}$$ molecules, the formation of oxide-layers with a sub-nanometer scale is possible at room temperature.

Journal Articles

Reactor-neutron-capture cross sections of $$^{1}$$$$^{6}$$$$^{5}$$Dy isomers

;

Journal of Inorganic and Nuclear Chemistry, 43, p.1107 - 1113, 1981/00

 Times Cited Count:4 Percentile:78.88(Chemistry, Inorganic & Nuclear)

no abstracts in English

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