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Nb by activation method and half-life of 
Nb by mass analysisNakamura, Shoji; Shibahara, Yuji*; Endo, Shunsuke; Kimura, Atsushi
Journal of Nuclear Science and Technology, 60(11), p.1361 - 1371, 2023/11
Times Cited Count：1 Percentile：72.91(Nuclear Science & Technology)The thermal-neutron capture cross section (
) and resonance integral (I) for Nb among nuclides for decommissioning were measured by an activation method and the half-life of Nb by mass analysis. Niobium-93 samples were irradiated with a hydraulic conveyer installed in the research reactor in Institute for Integral Radiation and Nuclear Science, Kyoto University. Gold-aluminum, cobalt-aluminum alloy wires were used to monitor thermal-neutron fluxes and epi-thermal Westcott's indexes at an irradiation position. A 25-
m-thick gadolinium foil was used to sort out reactions ascribe to thermal-and epi-thermal neutrons. Its thickness provided a cut-off energy of 0.133 eV. In order to attenuate radioactivity of 
Ta due to impurities, the Nb samples were cooled for nearly 2 years. The induced radio activity in the monitors and Nb samples were measured by 
-ray spectroscopy. In analysis based on Westcott's convention, the and I values were derived as 1.11
0.04 barn and 10.50.6 barn, respectively. After the -ray measurements, mass analysis was applied to the Nb sample to obtain the reaction rate. By combining data obtained by both -ray spectroscopy and mass analysis, the half-life of Nb was derived as (2.000.15)
10
years.
Am(n,)
Am and Am(n,)
Am reactionsNakamura, Shoji; Shibahara, Yuji*; Endo, Shunsuke; Kimura, Atsushi
Journal of Nuclear Science and Technology, 58(3), p.259 - 277, 2021/03
Times Cited Count：5 Percentile：53.85(Nuclear Science & Technology)Research and development were made for accuracy improvement of neutron capture cross section data on Am among minor actinides. First, the emission probabilities of decay rays were obtained with high accuracy, and the amount of the ground state of 
Am produced by reactor neutron irradiation of Am was examined by -ray measurement. Next, the total amount of isomer and ground states was examined by 
-ray measurement. Thermal-neutron capture cross sections and resonance integrals were derived both for the Am(n,)Am and for Am(n,)Am reactions.
Harada, Hideo; Takayama, Naoki; Komeda, Masao
Journal of Physics Communications (Internet), 4(8), p.085004_1 - 085004_17, 2020/08
A new convention of epithermal neutron spectrum is formulated for improving accuracy of resonance integrals. The new type function is proposed as an approximating function of epithermal neutron spectrum based on calculations by the state-of-art Monte Carlo code MVP-3. Bias effects on determination of resonance integrals due to utilizing approximating functions of the traditional types and the new type are compared. The other bias effect is also investigated, which is caused by neglecting position dependence of a neutron spectrum inside an irradiation capsule. For demonstrating the bias effects due to these assumptions on neutron spectrum quantitatively in a practical case, the thermal neutron-capture cross section and resonance integral of 
Cs measured at a research reactor JRR-3 are re-evaluated. A superior property of the proposed new convention is discussed. The experimental method is proposed to determine the new shape factor 
introduced in the convention by a combinational use of triple flux monitors (
Au, 
Co and Zr), and its analytical methodology is formulated.
Am(n,)Am, Am reactionsNakamura, Shoji; Endo, Shunsuke; Kimura, Atsushi; Shibahara, Yuji*
KURNS Progress Report 2019, P. 132, 2020/08
Research and development were made for accuracy improvement of neutron capture cross section data on Am among minor actinides. First, the emission probabilities of decay rays were obtained with high accuracy, and the amount of the ground state of Am produced by reactor neutron irradiation of Am was examinded by -ray measurement. Next, the total amount of isomer and ground states was examoned by -ray measurement.
Nakamura, Shoji; Shibahara, Yuji*; Kimura, Atsushi; Iwamoto, Osamu; Uehara, Akihiro*; Fujii, Toshiyuki*
Journal of Nuclear Science and Technology, 57(4), p.388 - 400, 2020/04
Times Cited Count：3 Percentile：31.89(Nuclear Science & Technology)The thermal-neutron capture cross-section (
) and resonance integral(I) were measured for the Cs(n,)
Cs reaction by an activation method and mass spectrometry. We used Cs contained as an impurity in a normally available 
Cs standard solution. An isotope ratio of Cs and Cs in a standard Cs solution was measured by mass spectrometry to quantify Cs. The analyzed Cs samples were irradiated at the hydraulic conveyer of the research reactor in Institute for Integral Radiation and Nuclear Science, Kyoto University. Wires of Co/Al and Au/Al alloys were used as neutron monitors to measure thermal-neutron fluxes and epi-thermal Westcott's indices at an irradiation position. A gadolinium filter was used to measure the , and a value of 0.133 eV was taken as the cut-off energy. Gamma-ray spectroscopy was used to measure induced activities of Cs, Cs and monitor wires. On the basis of Westcott's convention, the and I values were derived as 8.570.25 barn, and 45.33.2 barn, respectively. The obtained in the present study agreed within the limits of uncertainties with the past reported value of 8.30.3 barn.
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：5 Percentile：48.99(Nuclear Science & Technology)The thermal-neutron capture cross-section()and resonance integral(I) were measured for the 
Np(n,)
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 with paying attention to the first resonance at 0.489 eV of 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 -ray spectroscopy was used to measure activities of Np, Np and neutron monitors. On the basis of Westcott's convention, the and I values were derived as 186.96.2 barn, and 100990 barn, respectively.
AmShinohara, Nobuo; ; ; Kono, Nobuaki
Journal of Nuclear Science and Technology, 34(7), p.613 - 621, 1997/07
Times Cited Count：32 Percentile：89.63(Nuclear Science & Technology)no abstracts in English
Kato, Toshio*; Ogata, Yoshimune*; Harada, Hideo*; *; Sekine, Toshiaki;
Global 1995,Int. Conf. on Evaluation of Emerging Nuclear Fuel Cycle Systems, 2, p.1552 - 1559, 1995/00
no abstracts in English
Okuno, Hiroshi; Komuro, Yuichi
JAERI-M 94-049, 28 Pages, 1994/03
no abstracts in English
Cs(n,)
CsSekine, Toshiaki; ; Kobayashi, Katsutoshi; Harada, Hideo*; Watanabe, Hisashi*; Kato, Toshio*
Journal of Nuclear Science and Technology, 30(11), p.1099 - 1106, 1993/11
Times Cited Count：27 Percentile：90.21(Nuclear Science & Technology)no abstracts in English
Cs(n,)CsSekine, Toshiaki; ; Kobayashi, Katsutoshi; Harada, Hideo*; Watanabe, Hisashi*; Kato, Toshio*
Proc. of the Nuclear Data for Science and Technology, p.57 - 58, 1992/00
no abstracts in English
Okuno, Hiroshi; Naito, Yoshitaka; Sakurai, Y.*
Journal of Nuclear Science and Technology, 28(10), p.958 - 960, 1991/10
no abstracts in English
Eu in a reactor; The cross sections of Eu and Eu; ;
Appl.Radiat.Isot., 38(7), p.513 - 516, 1987/07
no abstracts in English
Spectrochimica Acta, Part A, 34(2), p.147 - 152, 1978/02
no abstracts in English
Pu resonance fission integralJournal of Nuclear Science and Technology, 4(1), p.43 - 44, 1967/00
Times Cited Count：0no abstracts in English
