Experimental apparatus at KUR-ISOL to identify isomeric transitions from fission products, and decay spectroscopy of 151Ce

Y. Kojima; M. Shibata; A. Taniguchi; Y. Kawase; R. Doi; A. Nagao; K. Shizuma

doi:10.1016/j.nima.2006.05.014

Experimental apparatus at KUR-ISOL to identify isomeric transitions from fission products, and decay spectroscopy of 151Ce

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment ◽

10.1016/j.nima.2006.05.014 ◽

2006 ◽

Vol 564 (1) ◽

pp. 275-282 ◽

Cited By ~ 7

Author(s):

Y. Kojima ◽

M. Shibata ◽

A. Taniguchi ◽

Y. Kawase ◽

R. Doi ◽

...

Keyword(s):

Fission Products ◽

Decay Spectroscopy ◽

Experimental Apparatus ◽

Isomeric Transitions

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Search for isomeric transitions in fission products around mass number 150

10.1051/ndata:07185 ◽

2007 ◽

Author(s):

Y. Kojima ◽

M. Shibata ◽

A. Taniguchi ◽

A. Murataka ◽

K. Ota ◽

...

Keyword(s):

Mass Number ◽

Fission Products ◽

Isomeric Transitions

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Experimental Equipment Design and Testing of the DEOX Process

12th International Conference on Nuclear Engineering, Volume 3 ◽

10.1115/icone12-49451 ◽

2004 ◽

Author(s):

K. J. Bateman ◽

B. R. Westphal ◽

M. A. Stawicki

Keyword(s):

National Laboratory ◽

Argonne National Laboratory ◽

Fission Products ◽

Reduction Process ◽

Preliminary Test ◽

Size Reduction ◽

Spent Fuel ◽

Oak Ridge ◽

Treatment Processes ◽

Experimental Apparatus

Several technologies exist or are under development for treating spent oxide nuclear fuels. Foremost among these are aqueous and pyrochemical reprocessing which both involve a head-end fuel dissolution step. This dissolution step may potentially be shortened if it is combined with a fuel decladding and size reduction process. Declad and Oxidize (DEOX), an advanced head-end processing concept, is being assessed at Argonne National Laboratory to meet these decladding and size reduction needs via the oxidation of UO2 to U3O8. This work is being done in collaboration with Oak Ridge National Laboratory. The primary objectives of the DEOX process are to generate suitable feed material for these two fuel treatment processes and to collect information about the behavior of spent fuel during DEOX processing. Specifically, DEOX is intended to remove the spent fuel from its cladding, while avoiding oxidation of the cladding that would contaminate the product. An additional goal is to obtain a product particle size distribution between 45μm to 4mm. Data will be collected on the extent of fuel oxidation and on the volatilization of fission products. The experimental apparatus used to perform these experiments is described in this report along with preliminary test results.

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Nuclear Processes Related to the Ap Stars and the Heaviest Chemical Elements

International Astronomical Union Colloquium ◽

10.1017/s0252921100080520 ◽

1976 ◽

Vol 32 ◽

pp. 169-182

Author(s):

B. Kuchowicz

Keyword(s):

Nuclear Physics ◽

Nuclear Reactions ◽

Chemical Elements ◽

Fission Products ◽

Abundance Pattern ◽

Isotopic Shifts ◽

Processed Material ◽

R Process ◽

Ap Stars ◽

Nuclear Processes

SummaryIsotopic shifts in the lines of the heavy elements in Ap stars, and the characteristic abundance pattern of these elements point to the fact that we are observing mainly the products of rapid neutron capture. The peculiar A stars may be treated as the show windows for the products of a recent r-process in their neighbourhood. This process can be located either in Supernovae exploding in a binary system in which the present Ap stars were secondaries, or in Supernovae exploding in young clusters. Secondary processes, e.g. spontaneous fission or nuclear reactions with highly abundant fission products, may occur further with the r-processed material in the surface of the Ap stars. The role of these stars to the theory of nucleosynthesis and to nuclear physics is emphasized.

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Irradiation behavior of pyrolytic silicon carbide

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100074288 ◽

1983 ◽

Vol 41 ◽

pp. 72-73

Author(s):

R. J. Lauf

Keyword(s):

Silicon Carbide ◽

Fission Products ◽

Thermodynamics And Kinetics ◽

Neutron Fluences ◽

Fuel Particles ◽

Sic Coatings ◽

Irradiation Behavior ◽

Kinetics Of ◽

Htgr Fuel

Fuel particles for the High-Temperature Gas-Cooled Reactor (HTGR) contain a layer of pyrolytic silicon carbide to act as a miniature pressure vessel and primary fission product barrier. Optimization of the SiC with respect to fuel performance involves four areas of study: (a) characterization of as-deposited SiC coatings; (b) thermodynamics and kinetics of chemical reactions between SiC and fission products; (c) irradiation behavior of SiC in the absence of fission products; and (d) combined effects of irradiation and fission products. This paper reports the behavior of SiC deposited on inert microspheres and irradiated to fast neutron fluences typical of HTGR fuel at end-of-life.

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TEM studies of amorphization processes and amorphous structures

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100104303 ◽

1988 ◽

Vol 46 ◽

pp. 448-449

Author(s):

T. E. Mitchell ◽

R. B. Schwarz

Keyword(s):

Amorphous Materials ◽

Fission Products ◽

Rapid Quenching ◽

Surface Films ◽

List Type ◽

Oxide Glasses ◽

Crystalline Materials ◽

Amorphous Structures ◽

Amorphous Surface ◽

Interfacial Films

Traditional oxide glasses occur naturally as obsidian and can be made easily by suitable cooling histories. In the past 30 years, a variety of techniques have been discovered which amorphize normally crystalline materials such as metals. These include [1-3]:Rapid quenching from the vapor phase.Rapid quenching from the liquid phase.Electrodeposition of certain alloys, e.g. Fe-P.Oxidation of crystals to produce amorphous surface oxide layers.Interdiffusion of two pure crystalline metals.Hydrogen-induced vitrification of an intermetal1ic.Mechanical alloying and ball-milling of intermetal lie compounds.Irradiation processes of all kinds using ions, electrons, neutrons, and fission products.We offer here some general comments on the use of TEM to study these materials and give some particular examples of such studies.Thin specimens can be prepared from bulk homogeneous materials in the usual way. Most often, however, amorphous materials are in the form of surface films or interfacial films with different chemistry from the substrates.

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