Pair Spectrometer Measurements in 500 MEV Bremsstrahlung

Citation

Cooper, Duane Herbert (1955) Pair Spectrometer Measurements in 500 MEV Bremsstrahlung. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/6MPX-3Q78. https://resolver.caltech.edu/CaltechETD:etd-12022003-161951

Abstract

Experiments are described as performed with a twenty channel pair spectrometer. This instrument uses a 30 ton electromagnet to measure the energies of electron pairs produced by electromagnetic quanta, giving a measurement of the energies of the quanta. These electron pairs are detected by a V shaped array of scintillators located within the magnet gap. A novel network of coincidence circuits, due to Matthew L. Sands, results in a considerable reduction in electronics complexity. With this spectrometer the synchrotron energy was calibrated to better than half a percent. An intensity calibration was obtained with an accuracy of about three percent. The bremsstrahlung spectrum was seen to agree in shape with theoretical predictions to within three or four percent. Relative pair production measurements gave agreement with theory to about two percent for copper and lead relative to aluminum. Absorption measurements in carbon, aluminum, copper, tin, and lead gave agreement with theory within about one percent.

Thesis Files