Proton distribution radii of ¹²⁻¹⁹C illuminate features of neutron halos

R. Kanungo , W. Horiuchi , G. Hagen , G. R. Jansen , P. Navratil , F. Ameil , J. Atkinson , Y. Ayyad

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D. Cortina-Gil I. Dillmann A. Estrad\'e A. Evdokimov F. Farinon H. Geissel G. Guastalla R. Janik M. Kimura R. Kn\"obel J. Kurcewicz Yu. A. Litvinov M. Marta M. Mostazo I. Mukha C. Nociforo H.J. Ong S. Pietri A. Prochazka C. Scheidenberger B. Sitar P. Strmen Y. Suzuki M. Takechi J. Tanaka I. Tanihata S. Terashima J. Vargas H. Weick J. S. Winfield

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classification ⚛️ nucl-ex nucl-th

keywords radiineutronprotonaccuratecalculationscarbonchangingcharge

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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.

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Proton distribution radii of ¹²⁻¹⁹C illuminate features of neutron halos

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