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 Title: Compton scattering from the proton below pion threshold: A measurement of the electric and magnetic polarizabilities of the proton Author(s): MacGibbon, Bruce Everett Doctoral Committee Chair(s): Nathan, Alan M. Department / Program: Physics Discipline: Physics Degree Granting Institution: University of Illinois at Urbana-Champaign Degree: Ph.D. Genre: Dissertation Subject(s): Physics, Nuclear Abstract: The Compton scattering cross section on the proton was measured at laboratory angles of 90$\sp\circ$ and 135$\sp\circ$, using 70-100 MeV tagged photons, and simultaneously using 100-150 MeV untagged photons, in order to determine the electric and magnetic polarizabilities. The 135$\sp\circ$ cross section is sensitive to the difference of the electric and magnetic polarizabilities, $\bar \alpha - \bar\beta$, while the 90$\sp\circ$ cross section is sensitive to the electric polarizability $\bar \alpha$. Using the model independent sum rule constraint for $\bar \alpha$ + $\bar \beta$ and a model dependent dispersion relation calculation, the values for the polarizabilities extracted from the cross sections are:$$\bar \alpha = (12.5 \pm 0.6 \pm 0.8 \pm 0.6) \times 10\sp{-4} fm\sp3\cr \bar \beta = (1.8 \mp 0.6 \mp 0.8 \mp 0.6) \times 10\sp{-4} fm\sp3$$where the errors shown are statistical, systematic, and model, respectively. Issue Date: 1995 Type: Text Language: English URI: http://hdl.handle.net/2142/20599 Rights Information: Copyright 1995 MacGibbon, Bruce Everett Date Available in IDEALS: 2011-05-07 Identifier in Online Catalog: AAI9543661 OCLC Identifier: (UMI)AAI9543661
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