Akademska digitalna zbirka SLovenije - logo
E-resources
Full text
Open access
  • Accurate Determination of the Neutron Skin Thickness of \(^{208}\)Pb through Parity-Violation in Electron Scattering
    Adhikari, D; Albataineh, H; Androic, D; Aniol, K; Armstrong, D S; Averett, T; Barcus, S; Bellini, V; Beminiwattha, R S; Benesch, J F; Bhatt, H; D Bhatta Pathak; Bhetuwal, D; Blaikie, B; Campagna, Q; Camsonne, A; Cates, G D; Chen, Y; Clarke, C; Cornejo, J C; S Covrig Dusa; Datta, P; Deshpande, A; Dutta, D; Feldman, C; Fuchey, E; Gal, C; Gaskell, D; Gautam, T; C Ayerbe Gayoso; Gericke, M; Ghosh, C; Halilovic, I; J -O Hansen; Hauenstein, F; Henry, W; Horowitz, C J; Jantzi, C; Jian, S; Johnston, S; Jones, D C; Karki, B; Katugampola, S; Keppel, C; King, P M; King, D E; Knauss, M; Kumar, K S; Kutz, T; Lashley-Colthirst, N; Leverick, G; Liu, H; Liyange, N; Malace, S; Mammei, R; Mammei, J; McCaughan, M; McNulty, D; Meekins, D; Metts, C; Michaels, R; Mondal, M M; Napolitano, J; Narayan, A; Rashad, M N H; Owen, V; Palatchi, C; 14 J Pan; Pandey, B; Park, S; Paschke, K D; Petrusky, M; Pitt, M L; Premathilake, S; Puckett, A J R; Quinn, B; Radloff, R; Rahman, S; Rathnayake, A; Reed, B T; Reimer, P E; Richards, R; Riordan, S; Roblin, Y; Seeds, S; Shahinyan, A; Souder, P; Tang, L; 16 M Thiel; Tian, Y; Urciuoli, G M; Wertz, E W; Wojtsekhowski, B; Yale, B; T Ye; Yoon, A; Zec, A; Zhang, W; Zhang, J; Zheng, X

    arXiv.org, 04/2021
    Paper, Journal Article

    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 \(A_{PV}=550\pm 16 {\rm (stat)}\pm 8\ {\rm (syst)}\) parts per billion, leading to an extraction of the neutral weak form factor \(F_W(Q^2 = 0.00616\ {\rm GeV}^2) = 0.368 \pm 0.013\). Combined with our previous measurement, the extracted neutron skin thickness is \(R_n-R_p=0.283 \pm 0.071\)~fm. The result also yields the first significant direct measurement of the interior weak density of \(^{208}\)Pb: \(\rho^0_W = -0.0796\pm0.0036\ {\rm (exp.)}\pm0.0013\ {\rm (theo.)}\ {\rm fm}^{-3}\) leading to the interior baryon density \(\rho^0_b = 0.1480\pm0.0036\ {\rm (exp.)}\pm0.0013\ {\rm (theo.)}\ {\rm fm}^{-3}\). 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.

Shelf entry