Proton distribution radii of $^{12-19}$C illuminate features of neutron halos

Authors :: Kanungo, R.
Horiuchi, W.
Hagen, G.
Jansen, G. R.
Navratil, P.
Ameil, F.
Atkinson, J.
Ayyad, Y.
Cortina-Gil, D.
Dillmann, I.
Estradé, A.
Evdokimov, A.
Farinon, F.
Geissel, H.
Guastalla, G.
Janik, R.
Kimura, M.
Knöbel, R.
Kurcewicz, J.
Litvinov, Yu. A.
Marta, M.
Mostazo, M.
Mukha, I.
Nociforo, C.
Ong, H. J.
Pietri, S.
Prochazka, A.
Scheidenberger, C.
Sitar, B.
Strmen, P.
Suzuki, Y.
Takechi, M.
Tanaka, J.
Tanihata, I.
Terashima, S.
Vargas, J.
Weick, H.
Winfield, J. S.
Source :: Phys. Rev. Lett. 117, 102501 (2016)
Publication Year :: 2016
Abstract: Proton radii of $^{12-19}$C densities derived from first accurate charge changing cross section measurements at 900$A$ MeV with a carbon target are reported. A thick neutron surface evolves from $\sim$ 0.5 fm in $^{15}$C to $\sim$ 1 fm in $^{19}$C. The halo radius in $^{19}$C is found to be 6.4$\pm$0.7 fm as large as $^{11}$Li. Ab initio calculations based on chiral nucleon-nucleon and three-nucleon forces reproduce well the radii.<br />Comment: 5 pages, 4 figures, accepted for publication in Phys. Rev. Lett

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