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Pair Spectrometer Measurements in 500 MEV Bremsstrahlung


Cooper, Duane Herbert (1955) Pair Spectrometer Measurements in 500 MEV Bremsstrahlung. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/6MPX-3Q78.


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.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Physics and Mathematics)
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Minor Option:Mathematics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Walker, Robert Lee
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1955
Record Number:CaltechETD:etd-12022003-161951
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4712
Deposited By: Imported from ETD-db
Deposited On:04 Dec 2003
Last Modified:28 Jun 2023 20:54

Thesis Files

PDF (Cooper_dh_1955.pdf) - Final Version
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