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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"Van de Graaff"”.
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Ion source for Van De Graaff generator
… Experiments which require beam currents in the order of 100 micro-ampere can now be conducted with the ion source operating at its designed capacity.
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Bipolar voltage control of a 5 MV Van de Graaff generator.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1974. M.S.
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A test of parity conservation in proton-proton scattering at 15 MeV
… at the Los Alamos Scientific Laboratory tandem Van de Graaff to test the conservation of parity in proton-proton scattering. A parity violating effect was sought bv measuring the correlation bet\<1een the total p-p cross section and the he1icity of the incident beam. The experiment used …
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The Calibration of a Fission Chamber at 14 MeV: Accelerator based Neutron Beam Detection
… and will be cross-calibrated for neutron detection against a known fission chamber at Ohio University. The 4-MV Tandem Van De Graaff Accelerator was used to produce a neutron beam for calibration. Initial spectra show that the chamber is functioning properly and has a high signal to noise …
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Nuclear reaction analysis cross-sections measurements for Boron and Carbon.
… at Radiation Utilisation Group of Necsa. Deuteron-fnduced and "He-induced reactions were performed at the 4MV Van de Graaff accelerator at detection angles of 0= 150cand 135° for incident beam energies between 1.8 and 2.8 MeV. Immediate application of this study will help in determining: …
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The development of the national accelerator centre proton microprobe as an analytical tool in geochemistry
This thesis describes work performed to establish and demonstrate a quantitative trace element microanalysis technique for geological material using protons accelerated by the Van de Graaff Accelerator at the National Accelerator Centre (NAC) in Faure near Cape Town. The method relies on the …
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The ⁴⁴Ca(d,α)⁴²K reaction at 4.0 MeV
… has proven to be a very useful tool in understanding single- and two-particle transfer reactions and nuclear structure. The 4 MV Van de Graaff accelerator at Virginia Polytechnic Institute and State University was used to check the feasibility of DWBA analysis on the (d, α) reaction at low …
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Preliminary investigation of a possible dose rate effect on survival of cells irradiated with low energy protons
Apparatus has been developed for the irradiation of V79-379A Chinese hamster lung fibroblast cells with 3.6 MeV protons from the Van de Graaff accelerator at the National Accelerator Centre in Faure. The original intention of this work was to investigate and measure a possible dose rate effect on …
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Development of a duoplasmatron ion source at the Ithemba laboratory for accelerator based science (ithemba labs)
A cold hollow cathode duoplasmatron ion source has been designed, built, optimized and evaluated for use as an external stand-by ion source for the second injector cyclotron (SPC2) during those times that the light-ion injector cyclotron (SPCl) is out of operation and not available for …
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Analyse struktureller Defekte in kristallinen Schichten
Sowohl bei Diamant, als auch bei Nitriden treten ähnliche Probleme im Substratbereich auf. Während bei den Nitriden ein passendes Substratmaterial völlig fehlt, werden beim Diamant Alternativen zum Naturdiamant als Substrat gesucht, die deutlich billiger sind. In beiden Fällen tritt bei der …
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Nuclear resonance fluorescence in Si²⁸
… state games available for absorption. The energy deficit which appears in emission and absorption is made up by the kinetic energy of the compound nucleus recoiling from the proton bombardment. Variation of the angle between the collimator and the proton beam allows the measurement of the …
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Fast neutron leakage spectra for assemblies containing thorium, D{u2082}O and natural uranium
… measurements with a ³He spectrometer have been made to test the validity of the differential data of the ENOF/B-II files for thorium, natural uranium and heavy water. The experimental measurements of fast neutron spectra have been in two lattices of thorium metal and D₂O, a cylindrical array of …
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A new approach to neutron spectrometry with multi-element scintillators
… had a significant impact on the research and development of radiation detection instrumentation. Notably, there is ample worldwide scientific research effort into a better understanding of the material properties and nuclear interactions with a view to support the improvement of radiation …
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Development of a System for Real-Time Measurements of Metabolite Transport in Plants Using Short-Lived Positron-Emitting Radiotracers
… 200 years, the Earth's atmospheric carbon dioxide (CO<sub>2</sub>) concentration has increased by more than 35%, and climate experts predict that CO<sub>2</sub> levels may double by the end of this century. Understanding the mechanisms of resource management in plants is fundamental for …