The Experts below are selected from a list of 78 Experts worldwide ranked by ideXlab platform
R J Poreda - One of the best experts on this subject based on the ideXlab platform.
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hot Atom incorporation of Tritium Atoms into fullerenes
Chemical Physics Letters, 1994Co-Authors: Hugo A Jimenezvazquez, R J Cross, Martin Saunders, R J PoredaAbstract:We have used classical hot-Atom chemistry to put Tritium Atoms inside fullerene molecules. The Tritium is generated in a nuclear reactor with the reaction 6Li(n,α)3H. The hot Tritium Atom slows down and can end up being thermalized inside a fullerene where it is trapped. The irradiated sample is dissolved, chromatographed, and counted in a scintillation counter, showing a small Tritium activity. After some time, the sample is analyzed with a sensitive mass spectrometer, and 3He was found on heating above 400°C, showing that the Tritium had decayed leaving the 3He trapped inside the fullerene.
M K Sundaresan - One of the best experts on this subject based on the ideXlab platform.
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adiabatic and nonadiabatic corrections to beta decay of the Tritium Atom
Journal of Physics G, 1995Co-Authors: I S Barkin, M K SundaresanAbstract:The theoretical analysis of the environmental effects during beta decay is associated with the solution of a multiparticle problem in quantum mechanics. In the general case, we should take into account effects arising from the changing nuclear charge as well as the electromagnetic interaction of the beta particle with the Atomic electron. In this paper, we consider beta decay in the simplest Atomic structure-the Tritium Atom, and calculate both adiabatic and nonadiabatic corrections to the traditional beta decay theory. The results of these calculations have a significant bearing on the extraction of neutrino mass from very accurate measurements of the beta spectrum of Tritium.
R. Jacot-guillarmod - One of the best experts on this subject based on the ideXlab platform.
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Time-of-flight measurement of resonant molecular formation in muon-catalyzed dt fusion
Hyperfine Interactions, 1996Co-Authors: G. M. Marshall, A. Adamczak, J. M. Bailey, G. A. Beer, J. L. Beveridge, J. L. Douglas, M. P. Faifman, M. C. Fujiwara, T. M. Huber, R. Jacot-guillarmodAbstract:Preliminary results are reported for an experiment at TRIUMF where a time-of-flight technique was tested for measuring the energy dependence of the rate for muon-catalyzed dt fusion. Muonic Tritium Atoms were created following transfer of negative muons from muonic protium in a layer of solid hydrogen (protium) containing a small fraction of Tritium. The Atoms escaped from the solid layer via the Ramsauer-Townsend mechanism, traversed a drift region of 18 mm, and then struck an adjacent layer of deuterium, where the muonic Atom could form a molecular system. The time of detection of a fusion product (neutron or alpha) following muon arrival is dependent upon the energy of the muonic Tritium Atom as it traverses the drift region. By comparison of the time distribution of fusion events with a prediction based on the theoretical energy dependence of the rate, the strength of resonant formation can in principle be determined. The results extracted so far are discussed and the limitations of the method are examined.
Luis Padilla-campos - One of the best experts on this subject based on the ideXlab platform.
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POSIBLES SITIOS DE OCUPACIÓN PARA EL TRITIO EN EL TITANATO DE LITIO: UN ESTUDIO DFT PERIÓDICO POSSIBLE OCCUPATION SITES OF Tritium INSIDE LITHIUM TITANATE: A PERIODIC DFT STUDY
2020Co-Authors: Antonio Buljan, Luis Padilla-camposAbstract:In this work theoretical investigation about possible occupation sites for Tritium Atoms in lithium titanate structure using a Functional Theory Density (DFT) periodical method implemented in VASP package, is presented. Two possible substitutional Li sites were identified for a Tritium Atom, one in the titanium layer and the other in the lithium layer. This study showed that the Tritium released would favorably occupy positions in lithium layers than in titanium layers. Tritium occupying sites in titanium layers would require more energy to release in comparison to lithium layers. It is evidence an interesting relation is seen between these results and experimental data found in the literature.
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A theoretical investigation of occupation sites for Tritium Atoms in lithium titanate
Journal of Molecular Structure-theochem, 2003Co-Authors: Luis Padilla-camposAbstract:Abstract Tritium breeder materials are fundamental to the development of a nuclear fusion reactor. One of the materials in investigation is lithium titanate, which has good thermal stability, high density of lithium and low activation under irradiation, fundamental properties that are demanded to this type of materials. However, few studies have been carried out on this material in order to know its more relevant properties and so to allow for the design of a material with the optimal characteristics to be used in a fusion reactor. This work presents a theoretical investigation on possible occupation sites for Tritium Atoms in the lithium titanate structure using ab initio Hartree Fock (HF) method. Two octahedral sites are compared with substitutional sites studied previously. This study shows that one of the octahedral sites is more favorable for the occupation of a Tritium Atom followed for substitutional sites. The octahedral site near the titanium layer is not favorable mainly for structural aspects. Tritium located at the most favorable sites does not affect the structural and electronic stabilities of the material.
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Theoretical study of two possible occupation sites for Tritium Atoms in lithium titanate
Journal of Molecular Structure-theochem, 2002Co-Authors: Luis Padilla-camposAbstract:Abstract Tritium breeder materials are fundamental to the development of a fusion reactor. One of the materials under investigation is lithium titanate, which has a good thermal stability, high density of lithium and low activation under irradiation, which are the fundamental properties that are demanded from this type of materials. However, there are little data on physical and chemical properties, which are necessary in order to design a material with the best characteristics to be used in a fusion reactor. We present a theoretical investigation on possible occupation sites for Tritium Atoms in lithium titanate structure using ab initio Hartree–Fock method. Two possible substitutional Li sites were identified for a Tritium Atom: one in the titanium layer and the other in the lithium layer. This study showed that the Tritium released would favorably occupy positions in lithium layers than in titanium layers. Tritium occupying sites in titanium layers would require more energy to release in comparison to lithium layers. An interesting relation is seen between these results and experimental data.
Hugo A Jimenezvazquez - One of the best experts on this subject based on the ideXlab platform.
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hot Atom incorporation of Tritium Atoms into fullerenes
Chemical Physics Letters, 1994Co-Authors: Hugo A Jimenezvazquez, R J Cross, Martin Saunders, R J PoredaAbstract:We have used classical hot-Atom chemistry to put Tritium Atoms inside fullerene molecules. The Tritium is generated in a nuclear reactor with the reaction 6Li(n,α)3H. The hot Tritium Atom slows down and can end up being thermalized inside a fullerene where it is trapped. The irradiated sample is dissolved, chromatographed, and counted in a scintillation counter, showing a small Tritium activity. After some time, the sample is analyzed with a sensitive mass spectrometer, and 3He was found on heating above 400°C, showing that the Tritium had decayed leaving the 3He trapped inside the fullerene.
