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Open Access Dissertation
Doctor of Philosophy (PhD)
Year Degree Awarded
Dr. Krishna Kumar
Dr. Andrea Pocar
Dr. John Dubach
Nuclear | Plasma and Beam Physics
The Lead Radius Experiment (PREX) was carried out in order to provide a model independent measurement of the RMS radius √ < r2 >of the neutron distribution in the 208Pb nucleus. The parity-violating scattering asymmetry for longitudinally polarized 1.06 GeV electrons from an unpolarized 208Pb target was measured at Q2 = 0.00880 GeV2. This measurement was performed by the PREX collaboration in Hall A at Jefferson Laboratory in Newport News, VA, between March and June, 2010. The electron detectors used in this measurement were designed and fabricated by University of Massachusetts-Amherst and Smith College. The resulting parity-violating asymmetry was measured as APV = 656±60(stat.)±14(sys.) ppb. This asymmetry extrapolates to a difference in radii between the nuclear neutron and proton distributions of √ < r2n >- √ < r2p >=0.33 +0.16 −0.18 fm.
Wexler, Jonathan W., "Measurement of the Parity Violating Asymmetry in Elastic Electron Scattering off 208Pb" (2014). Doctoral Dissertations. 246.