Naslov
Accurate Determination of the Neutron Skin Thickness of208Pb through Parity-Violation in Electron Scattering
(Accurate Determination of the Neutron Skin Thickness of 208Pb through Parity-Violation in Electron Scattering)

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

Kolaboracija
PREX Collaboration ; CREX Collaboration

Izvornik
Physical review letters (0031-9007) 126 (2021); 172502, 7

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
electron scattering, precision measurement, elastic scattering, neutron star

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA