JOPSS - Search Results

Journal Articles

First accurate normalization of the -delayed decay of $^{16}$ N and implications for the $^{12}$ C(,) $^{16}$ O astrophysical reaction rate

Kirsebom, O. S.*; Tengblad, O.*; Andreyev, A. N.; 41 of others*

Physical Review Letters, 121(14), p.142701_1 - 142701_6, 2018/10

https://doi.org/10.1103/PhysRevLett.121.142701

Times Cited Count：7 Percentile：50.13(Physics, Multidisciplinary)

Journal Articles

-delayed fission and decay of $^{196}$ At

Truesdale, V. L.*; Andreyev, A. N.; Ghys, L.*; Huyse, M.*; Van Duppen, P.*; Sels, S.*; Andel, B.*; Antalic, S.*; Barzakh, A.*; Capponi, L.*; et al.

Physical Review C, 94(3), p.034308_1 - 034308_11, 2016/09

https://doi.org/10.1103/PhysRevC.94.034308

Times Cited Count：10 Percentile：59.81(Physics, Nuclear)

JAEA Reports

User's manual of a computer code for Seismic Hazard Evaluation for Assessing the Threat to a facility by Fault Model; SHEAT-FM

Sugino, Hideharu*; Onizawa, Kunio; Suzuki, Masahide

JAERI-Data/Code 2005-008, 95 Pages, 2005/09

JAERI-Data-Code-2005-008.pdf:3.46MB

To establish the reliability evaluation method for aged structural component, we developed a probabilistic seismic hazard evaluation code SHEAT-FM (Seismic Hazard Evaluation for Assessing the Threat to a facility site; Fault Model) using a seismic motion prediction method based on fault model. In order to improve the seismic hazard evaluation, this code takes the latest knowledge in the field of earthquake engineering into account. For example, the code involves a group delay time of observed records and an update process model of active fault. This report describes the user's guide of SHEAT-FM, including the outline of the seismic hazard evaluation, specification of input data, sample problem for a model site, system information and execution method.

Journal Articles

Spatially resolved electron energy-loss spectroscopy of the surface excitations on the insulating fine particle of aluminum oxide

Abe, Hiroyuki; Kurata, Hiroki; Hojo, Kiichi

Journal of the Physical Society of Japan, 69(5), p.1553 - 1557, 2000/05

https://doi.org/10.1143/JPSJ.69.1553

Times Cited Count：4 Percentile：38.2(Physics, Multidisciplinary)

no abstracts in English

JAEA Reports

Raman spectroscopic measurements of porewater in bentonite

Suzuki, Satoru; ; *

JNC TN8400 2000-020, 25 Pages, 2000/04

JNC-TN8400-2000-020.pdf:0.94MB

Nature of porewater in bentonite plays important roles on the mass transport in the compacted bentonite used as a physical and chemical buffer material of the multi-barrier system in the high level radioactive waste manegement Higher activation energies of diffusion in the compacted bentonite than those in the aqueous solution is due probably to change in molecular structure of water in the porewater. The Raman spectroscopy was applied to studying the structure of porewater in bentonite at room temperature. Bentonite (Kunipia F, 98-99wt% of Na-smectite) was mixed with ion-exchanged water by water content of 75, 80, 90, 95 and 98wt% of water or with 0.5M NaCl aqueous solution by 75 and 80wt% of NaCl solution. Intensity maxima of the spectra of ion exchanged water, NaCl solution and their porewater were observed near 3200 to 3250, 3400, 3630cm $^{-1}$ . These bands can be attributed to water molecules forming stronger hydrogen bond in this manner. Ratio of intensity, 3250cm $^{-1}$ /3400cm $^{-1}$ , increased from 0.97 to 1.1 with a decrease in water content of 100wt% (water) to 75wt%. On the other hand, intensity ratio of 3400cm $^{-1}$ /3250cm $^{-1}$ of NaCl aqueous solution, 80wt%and 75wt% were 0.92, 1.2 and 1.3, respectively. Since the Raman scattering near 3250cm $^{-1}$ was attributed to water molecule forming the strongest hydrogen bonding in the three bands, those changes in intensity ratio suggests an increase in number of water molecule forming strong hydrogen bond in porewater of the bentonite. The constrained porewater possibly results in the high activation energy of diffusion in the compacted bentonite.

Journal Articles

Deposition behavior of latex particles in filtration process through glass packed column

Chinju, H.*; Nagasaki, Shinya*; Tanaka, Satoru*; Tanaka, Tadao; Ogawa, Hiromichi

Materials Research Society Symposium Proceedings, Vol.556, p.743 - 750, 1999/00

no abstracts in English

Journal Articles

Concept and applicability of sorption distribution coefficient in the radionuclide transport model

*; Takasu, Aki*; *; Kimura, Hideo; Sato, Seichi*; Nagasaki, Shinya*; Nakayama, Shinichi; Niibori, Yuichi*; *; Mitsugashira, Toshiaki*; et al.

Genshiryoku Bakkuendo Kenkyu, 5(1), p.3 - 19, 1998/08

http://ci.nii.ac.jp/naid/40005195029

no abstracts in English

Journal Articles

Migration study of americium in porous medium

Tanaka, Tadao; Ogawa, Hiromichi

JAERI-Conf 99-004, p.654 - 661, 1998/03

https://jopss.jaea.go.jp/pdfdata/JAERI-Conf-99-004-Part1.pdf

no abstracts in English

Journal Articles

Experimental study on neptunium migration under in situ geochemical conditions

Kumata, Masahiro; Vandergraaf, T. T.*

Journal of Contaminant Hydrology, 35(1-3), p.31 - 40, 1998/00

https://doi.org/10.1016/S0169-7722(98)00113-2

Times Cited Count：6 Percentile：24(Environmental Sciences)

no abstracts in English

JAEA Reports

Diffusion Behaviour of Nuclides Considering Pathways in Fractured Crystalline Rocks

Sato, Haruo; ; ; *; *; Yui, Mikazu

PNC TN8410 97-127, 57 Pages, 1997/08

PNC-TN8410-97-127.pdf:1.51MB

Retardation of key nuclides is one of the most important mechanisms to be examined specifically and modelled for the performance assessment of geological disposal of radioactive waste. We have been studing diffusion of nuclides into the pore spaces of the rock matrix, sorption of nuclides on the rock pore surfaces and pore properties to quantify the degree of nuclide retardation in fractured crystalline rock. The work has concentrated on predominant water conducting fracture system in the host granodiorite in the Kamaishi In Situ Test Site, which consists of fracture fillings and altered granodiorite. Through-diffusion experiements to obtain effective and apparent diffusion coefficients (Da and De, respectively) for Na, Cs, HTO, Cl and Se as a function of ionic charge at 22 25 $^{circ}$ C and batch sorption experiments for Cs, Sr, Se, $^{238}$ U and $^{239}$ Pu were conducted on fracture fillings, altered and intact granodiorite. The experiments only for Se, a redox sensitive element, were done in an N2-atmospheric glove box (O $_{2}$ 1 ppm) to keep the chemical species. In situ groundwater (pH8.79.5) sampled from the same place as rock samples was used for the experiments. Porosity and density of cach rock sample were determined by both water saturation method and mercury porosimetry, and pore-size distribution and specific surface area of pores were measured by mercury porosimetry. The porosity is in the order; fracture fillings (5.6%) altered rock (3.2%) intact rock (2.3%). The pore-size distribution of the intact and altered granodiorite is ranging from 10 nm to 0.2 mm, and the fracture fillings have that of 50 nm to 0.2 mm, but a lot of pores were found around 100 nm and 0.2 mm in the fracture fillings. The effective diffusion coefficients for all species (Na $^{+}$ , Cs $^{+}$ , HTO, Cl $^{-}$ , Se0 $_{3}$ $^{2-}$ ) are in the order of fracture fillings altered rock intact rock in proportion to these porosities. Effective diffusion ...