September 2016

Journal

Proton distribution radii of 12 19 C illuminate features of neutron halos and neutron stars

By:
Kanungo, R.; Horiuchi, W.; Hagen, Gaute ; Jansen, Gustav R; Navratil, Petr; Ameil, F.; Atkinson, J; Ayyad, Y; Cortina-Gil, D.; Dillmann, I.; Estrade, A.; Evdokimov, A; Farinon, F; Geissel, H.; Guastalla, G; Janik, R; Kimura, M; Knobel, R; Kurcewicz, J.; Litvinov, Y.; Marta, M; Mostazo, M.; Mukha, I.; Nociforo, C; Ong, H. J.; Pietri, S; Prochazka, A; Scheidenberger, C; Sitar, B; Strmen, P; Suzuki, Yasuyuki; Takechi, M; Tanaka, J; Tanihata, I.; Terashima, S; Vargas, J; Weick, H; Winfield, J. S.
Journal Name:
Physical Review Letters
Page Number:
102501
Volume:
117
Issue Number:
10
Publication Date:
September 9, 2016
View DOI Listing:
https://doi.org/10.1103/PhysRevLett.117.102501

Abstract

Proton radii of 12 19 C densities derived from charge changing cross section measurements at 900A MeV with a carbon target are reported. A thick neutron surface evolves from ⇠ 0.5 fm in 15 C to ⇠ 1 fm in 19 C. The halo radius in 19 C is found to be 6.4±0.7 fm as large as 11 Li. Ab initio calculations based on chiral nucleon-nucleon and three-nucleon forces reproduce well the radii. The equation of state of asymmetric nuclear matter (EOS) is constrained using a correlation between the radii and the symmetry energy coefficient (S v ) and its density derivative (L) to S v = 24 - 31 MeV and L=37 - 47 MeV.

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