Publications
Publication Information
| Title | Precision Measurement of the Parity Violating Asymmetry in Elastic Electron Scattering of 208Pb |
| Authors | Tao Ye |
| JLAB number | JLAB-PHY-21-3554 |
| LANL number | (None) |
| Other number | (None) |
| Document Type(s) | (Thesis) |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
|
Thesis A PHD thesis Advisor(s) : Krishna Kumar | |
| Publication Abstract: | The Lead Radius Experiment (PREX) measures the parity violating asymmetry A PV in the elastic scattering of longitudinally polarized electrons from 208 Pb nuclei. A PV provides a model independent measure of the neutron skin thickness, the difference between the point neutron radius R n and the point proton radius R p . In the summer of 2019, the PREX-2 collaboration completed data collection utilizing the electron beam from the Continuous Electron Beam Accelerator Facility (CEBAF) in Jefferson Lab. The instrumentation and the experimental technique for systematic control of A PV measurement are introduced in Chapter 2 and Chapter 3. Chapter 4 introduces an event cut strategy taking target conditions into account to guarantee data quality. The discussion of the statistical properties of the data will be followed by the discussion on the correction for beam fluctuations. An accurate and precise beam correction method based on Lagrange multiplier regression and eigenvector analysis is developed in Chapter 5. After completion of data analysis, the PREX-2 result is A PV = 550 ± 16 (stat) ± 8 (syst) parts-per-billion. Combined with the PREX-1 data, the result leads to the extracted neutron skin thickness R n ? R p = 0.283 ± 0.071 fm in Pb-208. Implications of the PREX-2 results are discussed in Chapter 6. |
| Experiment Numbers: | E12-11-101 |
| Group: | Hall A |
| Document: | |
| DOI: | |
| Accepted Manuscript: | |
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