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ResearchHub is incentivizing healthy research behavior. At this time, first authors of open access papers are eligible for rewards. Visit the publications tab to view your eligible publications.
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Mantas Simkus
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Comparative study of the catalytic growth of patterned carbon nanotube films
Christian Klinke
et al.
Aug 3, 2005
Three different catalysts (Fe, Ni, Co nitrates dissolved in ethanol) werepatterned on a SiO2/Si substrate and multi-wall carbon nanotubes were grown bycatalytic decomposition of acetylene. We compare the growth of the carbonnanostructures in the temperature range between 580C and 1000C. With ourexperimental set-up the catalyst solutions of cobalt and nickel were found tobe less efficient than the one of iron. An optimal production of multi-wallnanotubes was observed at temperatures between 650C and 720C with the ironsolution as catalyst. We found a tendency towards thicker structures withhigher temperatures. Finally, we suggest a mechanism for the growth of thesecarbon structures.
Materials Science
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Materials Science
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Chargino Contributions to Epsilon and Epsilon-Prime
Andrian Liem
et al.
Jun 2, 2001
We analyze the chargino contributions to the K-\bar K mixing andepsilon-prime in the mass insertion approximation and derive the correspondingbounds on the mass insertion parameters. We find that the charginocontributions can significantly enlarge the regions of the parameter spacewhere CP violation can be fully supersymmetric. In principle, the observedvalues of epsilon and epsilon-prime may be entirely due to the chargino --up-squark loops.
Computer Science
Mathematics
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Computer Science
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Soft-Gluon Resummation for the Fragmentation of Light and Heavy Quarks at Large x
Andreas Kirschner
et al.
Jul 12, 2001
We present a QCD study of fragmentation processes for light and heavy quarksin the semi-inclusive region of large x. Large logarithmic terms, due tosoft-gluon radiation, are evaluated and resummed to all perturbative orders inthe QCD coupling alpha_s. Complete analytical results to next-to-leadinglogarithmic accuracy are given for one-particle and two-particle inclusivedistributions in e+e- annihilation and DIS. Factorization of parton radiationat low transverse momenta is exploited to identify the universal(process-independent) perturbative fragmentation function that controlsheavy-quark processes, and to perform next-to-leading logarithmic resummationof its soft-gluon contributions. To gauge the quantitative impact ofresummation, we perform numerical studies of light- and heavy-quarkfragmentation in e+e- collisions.
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Shell stabilization of super- and hyperheavy nuclei without magic gaps
Hamid Ronagh
et al.
Mar 23, 2001
Quantum stabilization of superheavy elements is quantified in terms of theshell-correction energy. We compute the shell correction using self-consistentnuclear models: the non-relativistic Skyrme-Hartree-Fock approach and therelativistic mean-field model, for a number of parametrizations. All the forcesapplied predict a broad valley of shell stabilization around Z=120 andN=172-184. We also predict two broad regions of shell stabilization inhyperheavy elements with N approx 258 and N approx 308. Due to the largesingle-particle level density, shell corrections in the superheavy elementsdiffer markedly from those in lighter nuclei. With increasing proton andneutron numbers, the regions of nuclei stabilized by shell effects becomepoorly localized in particle number, and the familiar pattern of shellsseparated by magic gaps is basically gone.
Nuclear Physics
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Nuclear Physics
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Nuclear binding energies: Global collective structure and local shell-model correlations
Covadonga Martínez Díaz-Caneja
et al.
Mar 27, 2001
Nuclear binding energies and two-neutron separation energies are analyzedstarting from the liquid-drop model and the nuclear shell model in order todescribe the global trends of the above observables. We subsequentlyconcentrate on the Interacting Boson Model (IBM) and discuss a new method inorder to provide a consistent description of both, ground-state andexcited-state properties. We address the artefacts that appear when crossingmid-shell using the IBM formulation and perform detailed numerical calculationsfor nuclei situated in the 50-82 shell. We also concentrate on local deviationsfrom the above global trends in binding energy and two-neutron separationenergies that appear in the neutron-deficient Pb region. We address possibleeffects on the binding energy, caused by mixing of low-lying $0^{+}$ intruderstates into the ground state, using configuration mixing in the IBM framework.We also study ground-state properties using a deformed mean-field approach.Detailed comparisons with recent experimental data in the Pb region are amplydiscussed.
Nuclear Physics
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Nuclear Physics
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Nucleon-Nucleon Scattering in a Three-Dimensional Approach
Hamid Ronagh
et al.
Apr 7, 2001
The nucleon-nucleon t-matrix is calculated directly as function of two vectormomenta for different realistic NN potentials. The angular and momentumdependence of the full amplitude is studied and NN observables are calculated.
Nuclear Physics
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Nuclear Physics
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Nuclear matter hole spectral function in the Bethe-Brueckner-Goldstone approach
Raymond W. Lam
et al.
Dec 19, 2001
The hole spectral function is calculated in nuclear matter to assess therelevance of nucleon-nucleon short range correlations. The calculation iscarried out within the Brueckner scheme of many-body theory by using severalnucleon-nucleon realistic interactions. Results are compared with otherapproaches based on variational methods and transport theory. Discrepanciesappear in the high energy region, which is sensitive to short rangecorrelations, and are due to the different many-body treatment more than to thespecific N-N interaction used. Another conclusion is that the momentumdependence of the G-matrix should be taken into account in any self consistentapproach.
Nuclear Physics
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Nuclear Physics
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A New Coupling Potential for the Scattering of Deformed Light Heavy-Ions
Hamid Ronagh
et al.
May 14, 2000
This letter introduces a new coupling potential to explain the experimentaldata over wide energy ranges for a number of systems. Within thecoupled-channels formalism, this letter first shows the limitations of thestandard coupled-channels theory in the case where one of the nuclei in thereaction is strongly deformed and then, demonstrates that a global solution tothe problems of light heavy-ion reactions such as $^{12}$C+$^{12}$C,$^{16}$O+$^{28}$Si and $^{12}$C+$^{24}$Mg can be found using a newsecond-derivative coupling potential in the coupled-channels formalism. Thisnew approach consistently improves the agreement with the experimental data forthe elastic and inelastic scattering data as well as for their excitationfunctions using constant or slightly energy-dependent parameters.
Nuclear Physics
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Nuclear Physics
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