Proton Distribution Radii of ^{12-19}C Illuminate Features of Neutron Halos.

R Kanungo,W Horiuchi,G Hagen,G R Jansen,P Navratil,F Ameil, J Atkinson,Y Ayyad,D Cortina-Gil,I Dillmann,A Estradé, A Evdokimov,F Farinon,H Geissel,G Guastalla,R Janik,M Kimura,R Knöbel,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

PHYSICAL REVIEW LETTERS（2016）

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摘要

Proton radii of C12-19 densities derived from first accurate charge changing cross section measurements at 900A MeV with a carbon target are reported. A thick neutron surface evolves from similar to 0.5 fm in C-15 to similar to 1 fm in C-19. The halo radius in C-19 is found to be 6.4 +/- 0.7 fm as large as Li-11. Ab initio calculations based on chiral nucleon-nucleon and three-nucleon forces reproduce the radii well.

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