Measurement of the Parity Violating Asymmetry in Elastic Electron Scattering off 208Pb
- Univ. of Massachusetts, Amherst, MA (United States)
The Lead Radius Experiment (PREX) was carried out in order to provide a model-independent measurement of the RMS radius √<$$2\atop{n}$$> 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 √<$$2\atop{n}$$>-√<$$2\atop{p}$$>=0.33$$+0.16\atop{-0.18}$$ fm.
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1346705
- Report Number(s):
- JLAB-PHY--14-2025; DOE/OR/23177--4099
- Country of Publication:
- United States
- Language:
- English
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