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Compton Scattering

Compton Scattering. James Durgin Physics 521 March 19, 2009. Background. Collecting energies at several points lets one find electron mass and cross section. Image from user-review.ca. Photomultiper tube Scintillator Lead shielding Copper cylinder Source inside shielding.

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Compton Scattering

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  1. Compton Scattering James Durgin Physics 521 March 19, 2009

  2. Background Collecting energies at several points lets one find electron mass and cross section Image from user-review.ca

  3. Photomultiper tube Scintillator Lead shielding Copper cylinder Source inside shielding

  4. Experimental Theory • Calibrate multichannel analyzer • Collect energy spectrums with copper cylinder • Collect energy spectrums without copper cylinder • Fit points to find electron mass and experimental cross section

  5. Calibration Isotope energies v. channel number

  6. Energy Spectrums Counts per channel v. channel number Net counts v. channel number

  7. Net counts v. channel number Fit for Compton Scattered Photons Graphical Compton’s Equation

  8. Cross section comparison Collected data follows Klein-Nishina cross section Thomson cross section Thomson equation Klein-Nishina cross section Klein-Nishina equation

  9. Uncertainty Analysis • Statistical nature of counts • Setup uncertainty • Conversion uncertainty • Negligible events

  10. Conclusion • Experimental electron mass of 503.8 ± 14.6 keV v. actual electron mass of 510.998910±0.000013 keV • Collected data has closer agreement with Klein-Nishina model

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