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Accurate Determination of the Neutron Skin Thickness of 208Pb through Parity-Violation in Electron Scattering (CROSBI ID 308279)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

(PREX Collaboration ; CREX Collaboration) Adhikari, D. ; Androić, Darko ; et al. Accurate Determination of the Neutron Skin Thickness of 208Pb through Parity-Violation in Electron Scattering // Physical review letters, 126 (2021), 172502, 7. doi: 10.1103/PhysRevLett.126.172502

Podaci o odgovornosti

Adhikari, D. ; Androić, Darko ; et al.

PREX Collaboration ; CREX Collaboration

engleski

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

We report a precision measurement of the parity- violating asymmetry APV in the elastic scattering of longitudinally polarized electrons from Pb208. We measure APV=550±16(stat)±8(syst) parts per billion, leading to an extraction of the neutral weak form factor FW(Q2=0.00616 GeV2)=0.368±0.013. Combined with our previous measurement, the extracted neutron skin thickness is Rn- Rp=0.283±0.071 fm. The result also yields the first significant direct measurement of the interior weak density of Pb208: ρW0=-0.0796±0.0036(exp)±0.0013(theo) fm-3 leading to the interior baryon density ρb0=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.

electron scattering, precision measurement, elastic scattering, neutron star

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Podaci o izdanju

126

2021.

172502

7

objavljeno

0031-9007

1079-7114

10.1103/PhysRevLett.126.172502

Povezanost rada

Fizika

Poveznice
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