Proton radii of densities derived from first accurate charge changing cross section measurements at with a carbon target are reported. A thick neutron surface evolves from in to in . The halo radius in is found to be as large as . Ab initio calculations based on chiral nucleon-nucleon and three-nucleon forces reproduce the radii well.
DOI:https://doi.org/10.1103/PhysRevLett.117.102501
© 2016 American Physical Society
Schematic view of the experiment setup at the FRS with detector arrangement at the final focus F4.
Reuse & Permissionsextracted from for (black filled circles). The blue open diamonds are from scattering and muonic x rays for . (a) The relativistic mean field theory calculations with spherical (deformed) potentials are shown by the red solid line (blue dashed line). The green dotted line shows the results of Hartree-Fock calculations. The antisymmetrized molecular dynamics (AMD) results are shown by open triangles [27] and open squares [28]. (b) The ’s from the present analysis of [7] are shown by black open circles. The results of coupled-cluster calculations are shown for as solid (red) and dotted (black) lines using the chiral interaction and the nucleon-nucleon interaction [29], respectively. The matter radii with are shown by the red dashed line. The shaded bands show the predicted uncertainty.
Reuse & PermissionsThe comparison of data with coupled-cluster predictions for (a) proton radii and (b) matter radii. The chiral interactions [39] are EM1 (dotted blue curve), EM3 (dashed double-dotted pink curve), EM4 (dashed black curve) and EM5 (solid green curve).
Reuse & Permissions(a) The measured neutron skin thickness for compared to predictions using the different interactions, (red solid curve), EM1 (dotted blue curve), EM3 (dashed-double-dotted pink curve), EM4 (dashed black curve), and EM5 (solid green curve). (b) The measured neutron skin thickness variation with for .
Reuse & Permissions
