6533b7d2fe1ef96bd125e93b
RESEARCH PRODUCT
Accurate Determination of the Neutron Skin Thickness of Pb208 through Parity-Violation in Electron Scattering
S. RahmanH. AlbatainehB. YaleK. S. KumarS. SeedsA. DeshpandeC. Ayerbe GayosoA. YoonQ. CampagnaG. M. UrciuoliG. LeverickR. MammeiBogdan WojtsekhowskiD. S. ArmstrongPaul SouderSiyu JianC. PalatchiS. JohnstonC. JantziH. BhattP. E. ReimerB. KarkiDipangkar DuttaT. YeD. KingD. McnultyM. KnaussL. G. TangL. G. TangJ. C. CornejoT. GautamS. KatugampolaP. M. KingR. W. RadloffH. LiuJ. O. HansenJ. PanD. C. JonesMichael PittS. RiordanE. W. WertzS. ParkR. MichaelsY. TianC. MettsM. N. H. RashadP. DattaS. PremathilakeS. MalaceW. ZhangS. Covrig DusaY. RoblinI. HalilovicK. A. AniolT. AverettS. BarcusC. FeldmanN. LiyangeB. PandeyA. ZecE. FucheyCharles HorowitzJay BeneschMichaela ThielKent PaschkeA. NarayanC. GhoshC. GhoshD. AdhikariBrendan ReedB. P. QuinnJiawen ZhangJiawen ZhangF. HauensteinCynthia KeppelM. PetruskyDarko AndroićG. D. CatesD. G. MeekinsR. RichardsV. BelliniN. Lashley-colthirstA. RathnayakeM. M. MondalX. ZhengMichael GerickeM. MccaughanAndrew PuckettJuliette MammeiA. CamsonneA. ShahinyanB. BlaikieC. ClarkeD. GaskellY. ChenJim NapolitanoV. OwenC. GalC. GalD. NikolaevD. BhetuwalR. S. BeminiwatthaW. HenryT. KutzD. Bhatta Pathaksubject
Elastic scatteringPhysicsEquation of state (cosmology)media_common.quotation_subjectForm factor (quantum field theory)General Physics and Astronomy01 natural sciencesAsymmetry0103 physical sciencesSaturation (graph theory)NeutronAtomic physics010306 general physicsElectron scatteringEnergy (signal processing)media_commondescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-04-27 | Physical Review Letters |