Date of Award

Winter 12-22-2021

Degree Type


Degree Name

Doctor of Philosophy (PhD)




Souder, Paul A.


moller polarimetry, neutron skin, nuclear eos, parity violation, spin physics, weak form factor

Subject Categories

Nuclear | Physical Sciences and Mathematics | Physics


The Lead Radius Experiment 2 (PREX-II) and Calcium Radius Experiment (CREX) carried out in Hall A of the Thomas Jefferson National Accelerator Facility were designed to measure the neutron skins of 208-Pb and 48-Ca nuclei by measuring the parity-violating asymmetry APV of the elastic scattering of polarized electrons on 208-Pb and 48-Ca targets. In order to achieve a precision measurement of the neutron skins of 208-Pb and 48-Ca it is imperative to maintain precise control over many experimental parameters–one of which is a precision measurement of the electron beam polarization (which is the largest contributor to experimental error making control a high priority). The results of the Møller polarimetry measurements taken over the PREX-II experiment averaged 89.7% ± 0.1% (stat) ± 0.89% (syst) while results from the CREX experiment were in remarkable agreement with the Compton Polarimetry results. The PREX-II experimental results returned an APV = 550 ± 16 (stat) ± 8 (sys) ppb corresponding to a 208-Pb neutron skin thickness of 0.283 ± 0.071 fm.

This dissertation will detail the author's work towards ensuring precision Møller polarimetry measurements for the PREX-II and CREX experiments, a review of associated systematics, and Møller polarimetry analysis results for PREX-II and CREX. A brief review of the PREX-II general experimental analysis and results are also provided as well as additional work done in the development efforts for the anticipated future SoLID experiments.


Open Access

Included in

Nuclear Commons