Title

Accurate Determination of the Neutron Skin Thickness of ^{208}Pb through Parity-Violation in Electron Scattering

DOI

10.1103/PhysRevLett.126.172502

Authors

D Adhikari, Idaho State University, Pocatello, ID 83209, USA.
H Albataineh, Texas A & M University-Kingsville, Kingsville, TX 78363, USA.
D Androic, University of Zagreb, Faculty of Science.
K Aniol, California State University, Los Angeles, Los Angeles, California 90032, USA.
D S. Armstrong, William & Mary, Williamsburg, Virginia 23185, USA.
T Averett, William & Mary, Williamsburg, Virginia 23185, USA.
C Ayerbe Gayoso, William & Mary, Williamsburg, Virginia 23185, USA.
S Barcus, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
V Bellini, Istituto Nazionale di Fisica Nucleare, Sezione di Catania, 95123 Catania, Italy.
R S. Beminiwattha, Louisiana Tech University, Ruston, LA 71272 USA.
J F. Benesch, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
H Bhatt, Mississippi State University, Mississippi State, MS 39762, USA.
D Bhatta Pathak, Louisiana Tech University, Ruston, LA 71272 USA.
D Bhetuwal, Mississippi State University, Mississippi State, MS 39762, USA.
B Blaikie, University of Manitoba, Winnipeg, MB R3T2N2 Canada.
Q Campagna, William & Mary, Williamsburg, Virginia 23185, USA.
A Camsonne, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
G D. Cates, University of Virginia, Charlottesville, VA 22904, USA.
Y Chen, Louisiana Tech University, Ruston, LA 71272 USA.
C Clarke, Stony Brook, State University of New York, NY 11794, USA.
J C. Cornejo, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
S Covrig Dusa, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
P Datta, University of Connecticut, Storrs, CT 06269, USA.
A Deshpande, Stony Brook, State University of New York, NY 11794, USA.
D Dutta, Mississippi State University, Mississippi State, MS 39762, USA.
C Feldman, Stony Brook, State University of New York, NY 11794, USA.
E Fuchey, University of Connecticut, Storrs, CT 06269, USA.
C Gal, University of Virginia, Charlottesville, VA 22904, USA.
D Gaskell, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
T Gautam, Hampton University, Hampton, Virginia 23668, USA.
M Gericke, University of Manitoba, Winnipeg, MB R3T2N2 Canada.
C Ghosh, Stony Brook, State University of New York, NY 11794, USA.
M Knauss, Duquesne University, 600 Forbes Avenue, Pittsburgh, PA 15282, USA

Document Type

Journal Article

Publication Date

4-30-2021

Publication Title

Physical review letters

Volume

126

Issue

17

First Page

172502

Abstract

We report a precision measurement of the parity-violating asymmetry A_{PV} in the elastic scattering of longitudinally polarized electrons from ^{208}Pb. We measure A_{PV}=550±16(stat)±8(syst) parts per billion, leading to an extraction of the neutral weak form factor F_{W}(Q^{2}=0.00616  GeV^{2})=0.368±0.013. Combined with our previous measurement, the extracted neutron skin thickness is R_{n}-R_{p}=0.283±0.071  fm. The result also yields the first significant direct measurement of the interior weak density of ^{208}Pb: ρ_{W}^{0}=-0.0796±0.0036(exp)±0.0013(theo)  fm^{-3} leading to the interior baryon density ρ_{b}^{0}=0.1480±0.0036(exp)±0.0013(theo)  fm^{-3}. The measurement accurately constrains the density dependence of the symmetry energy of nuclear matter near saturation density, with implications for the size and composition of neutron stars.

Open Access

OA

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