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Study of Neutron Capture Reactions Using the 4π Ge Spectrometer
H. Harada,S. Goko,A. Kimura,M. Ohta,M. Oshima,F. Kitatani,M. Igashira,T. Katabuchi,M. Mizumoto,T. Ohsaki,J. Hori,T. Fujii,K. Takamiya,J. Goto,Y. Kiyanagi,K. Kino,M. Furusaka,F. Hiraga,T. Kamiyama 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The 4π Ge spectrometer composed of 22-30 Ge detectors was developed, and it has been used to study neutron capture reactions with a neutron time-of-flight (TOF) technique. Since the distances between the sample position and the Ge detectors are variable, it can be used as a multifunctional spectrometer. At first, it was used as a sum energy spectrometer, and resonances in ^(nat)Ag were identified as those of ^(1070Ag or ^(109)Ag. In second, it was used to deduce γ-ray intensity distribution for each resonance, and the results for ^(238)U were presented. In third, it was used to measure neutron capture cross sections of minor actinides and fission products at the electron linear accerelator facility of KURRI and at the accurate neutron-nucleus reaction measurement instrument (ANNRI) in MLF of J-PARC The preliminary results are discussed mainly based on measurements of neutron capture cross section for ^(241)Am, together with related techniques.
Optical characterization of CdTe/ZnSe fractional monolayer structures grown by atomic layer epitaxy
J.H.Chang,J.Y.Lee,M.Yang,H.S.Ahn,S.N.Yi,K.Goto,K.Godo,H.Makino,M.W.Cho,T.Yao,J.S.Song 한국물리학회 2004 Current Applied Physics Vol.4 No.6
Luminescence properties of CdTe/ZnSe fractional monolayer grown by atomic layer epitaxy have been investigated. To inves-tigate the origin of the highly ecient luminescence, various optical spectroscopic methods such as, photoluminescence (PL),temporal/spatial resolved PL, temperature dependence PL, and excitation power dependence PL have been used. It is found thatstructural inhomogeneities aect dominant inuence on the line width and line shape of luminescence. The luminescence intensitygreatly enhanced by the localization of exciton at the disorder induced localized states.
Goto, M.,Iwamura, T.,Han, S.Z.,Kim, S.,Yamamoto, T.,Lim, S.H.,Ahn, J-H.,Kitamura, J.,Lee, J. Elsevier 2019 International journal of fatigue Vol.123 No.-
<P><B>Abstract</B></P> <P>Fatigue tests were conducted on round bar specimens of a solution-treated and air-cooled Cu-Ni-Si alloy with high solute concentrations of 6% Ni and 1.5% Si. This alloy was strengthened by disc-shaped Ni<SUB>2</SUB>Si precipitates, a few tens of nanometers in diameter, formed during air cooling. The results were compared with those of a conventional solution-treated Cu-Ni-Si alloy cooled by water quenching. The correlation between the tensile and fatigue strengths of the two alloys differed completely from the general tendency that enhanced tensile strength brings an increase in fatigue strength. Indeed, the fatigue strength of the air-cooled Cu-Ni-Si alloy was 1.1 times higher than that of the water-quenched alloy, while the tensile strength was only 75% that of the water-quenched alloy. Moreover, the electrical conductivity of the air-cooled specimens in International Annealed Copper Standard (IACS) percentage points was 1.7 times higher than that of the water-quenched specimens. The physical background for the superior fatigue strength of the air-cooled Cu-Ni-Si alloy, including the role of microstructure, is discussed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Air cooling (AC) instead of water quenching (WQ) was applied after SHT. </LI> <LI> Fatigue strength of AC specimen was 1.1 times greater than WQ one. </LI> <LI> Electrical conductivity of AC specimen was 1.7 times greater than WQ one. </LI> <LI> Superior characteristics of AC specimen was discussed based on microstructure. </LI> </UL> </P>
Design of a 4πLaBr_3(Ce) Spectrometer for Neutron Capture Cross Section Measurements
J. Goto,H. Harada,F. Kitatani,Y. Nagai,M. Oshima,M. Segawa,Y. Toh 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
A 4πLaBr_3(Ce) spectrometer was designed for the measurements of neutron capture cross sections using a prompt γ-ray spectroscopic method with a time-of-flight technique. An optimum configuration for the 4πLaBr_3(Ce) spectrometer was chosen from four possible configurations based on comparison of simulated performance and cost of construction. Further simulations were performed to demonstrate performance of the 4πLaBr_3(Ce) spectrometer.
Goto, M.,Bae, Hee-Dong,Yahaya, M.S.,Karita, S.,Wanjae, K.,Baah, J.,Sugawara, K.,Cheng, K.J. Asian Australasian Association of Animal Productio 2003 Animal Bioscience Vol.16 No.1
The study evaluates the enzymatic dry matter (DM) degradability and water holding capacity of leaf and stem fractions of orchardgrass (Dactylis glomerata L.) at different growth stages with or without the presence of surfactant Tween 80. While Tween 80 significantly (p<0.05) increased water and enzyme holding capacities in the leaf blades fraction, less was observed in the fraction of leaf sheath and stem of orchardgrass. The enzyme holding capacity in the leaves was also altered more than that for water holding capacity. This resulted in the increased rate and extent of enzymatic hydrolysis of the leaf blade fractions at two growth stages, whereas little was with leaf sheath and stem fractions. It was also observed that at 0.005% concentrations of Tween 80 the enzymatic DM degradability of young leaf blades was higher (p<0.05) by 20-30% compared to that of the control, as well as for water and enzyme holding capacity. For matured leaf blades the DM degradability were increased with over 0.01% concentrations of the surfactant, but the increase was less than leaf blades of young orchardgrass. This result suggests the possibility of using the surfactant Tween 80 to improve forage digestibility in the rumen.
Goto, M.,Yamamoto, T.,Han, S.Z.,Lim, S.H.,Kim, S.,Iwamura, T.,Kitamura, J.,Ahn, J.-H.,Yakushiji, T.,Lee, J. Elsevier 2019 Materials science & engineering. properties, micro Vol.747 No.-
<P><B>Abstract</B></P> <P>The effect of microstructure on the fatigue strength of age-hardened Cu–6Ni–1.5Si alloy was investigated in this study. The aging was conducted at 500 °C for 0.5 h for the precipitation of disk-shaped δ-Ni<SUB>2</SUB>Si precipitates (continuous precipitates) and 3 h for the discontinuous precipitation of fiber-shaped, stable δ-Ni<SUB>2</SUB>Si precipitates to strengthen the Cu matrix. The tensile strength of 0.5 h-aged specimens was about 1.3 times greater than that of the 3 h-aged counterparts, but with inferior electrical conductivity. Despite the considerable difference in tensile strength, no notable difference in fatigue strength was observed between 0.5 h- and 3 h-aged specimens. The 3 h-aged specimens had superior electrical conductivity without sacrificing fatigue strength of the 0.5 h-aged specimens. The physical background of high-cycle fatigue strength in Cu–6Ni–1.5Si alloys with continuous precipitates and discontinuous precipitates is discussed considering the microstructure-sensitive behavior of fatigue cracks.</P>
Goto, M.,Yamamoto, T.,Han, S.Z.,Kim, S.,Ahn, J-H.,Kitamura, J.,Iwamura, T.,Lee, J. Elsevier 2017 Engineering fracture mechanics Vol.182 No.-
<P>For low-cycle fatigued, ultrafine grained copper, processed by equal channel angular pressing, a unique crack growth direction, either inclined at 45 degrees or perpendicular to the loading direction, was observed around the circumference of round bar specimens. In addition, the perpendicular cracks showed a 45 degrees deflected crack face toward the center of the specimens. To clarify the growth behavior of such inclined and deflected cracks, the role of the deformation mode at the crack-tip areas was discussed in terms of the surface damage caused by cyclic stressing and the mixed-mode deformation at the crack tips. The preexistent shear-bands/shear-cracks around the crack tips and the in-plane shear-mode deformation at the crack tips assisted the formation of shallow inclined- and deep deflected-cracks. To quantitatively estimate the severity of mechanical damage at the crack tips, the comparative stress intensity factor range under combined mode I, II and III conditions were calculated. The crack growth rate along the growth direction at the surface and bottom for inclined and deflected surface-cracks was discussed in terms of the comparative stress intensity factor range. (c) 2017 Elsevier Ltd. All rights reserved.</P>
J.H.Chang,S.H.Park,M.Yang,H.S.Ahn,S.N.Yi,K.Goto,M.W.Cho,T.Yao,J.S.Song 한국물리학회 2004 Current Applied Physics Vol.4 No.6
Photoluminescence (PL) linewidth broadening of CdxZn1. xSe/ZnSe triple quantum wells, grown on GaAs substrates bymolecular beam epitaxy (MBE), has been investigated. Various quantum well (QW) samples have been prepared with dierent QWthickness and composition (Cd-composition). Measured and calculated PL linewidth are compared. Both composition and thicknessuctuations are considered for the calculation with the parameters such as the volume of exciton, nominal thickness and compo-sition of QWs. Surface roughness measured by atomic force microscopy (AFM) is used to estimate the interface roughness. Resultsshow that when Cd-composition increases additional linewidth broadening due to Zn/Cd interdiusion is enhanced.